API Reference

User Functions

fsspec.available_compressions()

Return a list of the implemented compressions.

fsspec.available_protocols()

Return a list of the implemented protocols.

fsspec.filesystem(protocol, **storage_options)

Instantiate filesystems for given protocol and arguments

fsspec.fuse.run(fs, path, mount_point[, ...])

Mount stuff in a local directory

fsspec.generic.rsync(source, destination[, ...])

Sync files between two directory trees

fsspec.get_filesystem_class(protocol)

Fetch named protocol implementation from the registry

fsspec.get_mapper([url, check, create, ...])

Create key-value interface for given URL and options

fsspec.gui.FileSelector([url, filters, ...])

Panel-based graphical file selector widget

fsspec.open(urlpath[, mode, compression, ...])

Given a path or paths, return one OpenFile object.

fsspec.open_files(urlpath[, mode, ...])

Given a path or paths, return a list of OpenFile objects.

fsspec.open_local(url[, mode])

Open file(s) which can be resolved to local
fsspec.available_compressions()[source]

Return a list of the implemented compressions.

fsspec.available_protocols()[source]

Return a list of the implemented protocols.

Note that any given protocol may require extra packages to be importable.

fsspec.filesystem(protocol, **storage_options)[source]

Instantiate filesystems for given protocol and arguments

storage_options are specific to the protocol being chosen, and are passed directly to the class.

fsspec.fuse.run(fs, path, mount_point, foreground=True, threads=False, ready_file=False, ops_class=<class 'fsspec.fuse.FUSEr'>)[source]

Mount stuff in a local directory

This uses fusepy to make it appear as if a given path on an fsspec instance is in fact resident within the local file-system.

This requires that fusepy by installed, and that FUSE be available on the system (typically requiring a package to be installed with apt, yum, brew, etc.).

Parameters:
fs: file-system instance

From one of the compatible implementations

path: str

Location on that file-system to regard as the root directory to mount. Note that you typically should include the terminating “/” character.

mount_point: str

An empty directory on the local file-system where the contents of the remote path will appear.

foreground: bool

Whether or not calling this function will block. Operation will typically be more stable if True.

threads: bool

Whether or not to create threads when responding to file operations within the mounter directory. Operation will typically be more stable if False.

ready_file: bool

Whether the FUSE process is ready. The .fuse_ready file will exist in the mount_point directory if True. Debugging purpose.

ops_class: FUSEr or Subclass of FUSEr

To override the default behavior of FUSEr. For Example, logging to file.

fsspec.generic.rsync(source, destination, delete_missing=False, source_field='size', dest_field='size', update_cond='different', inst_kwargs=None, fs=None, **kwargs)[source]

Sync files between two directory trees

(experimental)

Parameters:
source: str

Root of the directory tree to take files from. This must be a directory, but do not include any terminating “/” character

destination: str

Root path to copy into. The contents of this location should be identical to the contents of source when done. This will be made a directory, and the terminal “/” should not be included.

delete_missing: bool

If there are paths in the destination that don’t exist in the source and this is True, delete them. Otherwise, leave them alone.

source_field: str | callable

If update_field is “different”, this is the key in the info of source files to consider for difference. Maybe a function of the info dict.

dest_field: str | callable

If update_field is “different”, this is the key in the info of destination files to consider for difference. May be a function of the info dict.

update_cond: “different”|”always”|”never”

If “always”, every file is copied, regardless of whether it exists in the destination. If “never”, files that exist in the destination are not copied again. If “different” (default), only copy if the info fields given by source_field and dest_field (usually “size”) are different. Other comparisons may be added in the future.

inst_kwargs: dict|None

If fs is None, use this set of keyword arguments to make a GenericFileSystem instance

fs: GenericFileSystem|None

Instance to use if explicitly given. The instance defines how to to make downstream file system instances from paths.

Returns:
dict of the copy operations that were performed, {source: destination}
fsspec.get_filesystem_class(protocol)[source]

Fetch named protocol implementation from the registry

The dict known_implementations maps protocol names to the locations of classes implementing the corresponding file-system. When used for the first time, appropriate imports will happen and the class will be placed in the registry. All subsequent calls will fetch directly from the registry.

Some protocol implementations require additional dependencies, and so the import may fail. In this case, the string in the “err” field of the known_implementations will be given as the error message.

fsspec.get_mapper(url='', check=False, create=False, missing_exceptions=None, alternate_root=None, **kwargs)[source]

Create key-value interface for given URL and options

The URL will be of the form “protocol://location” and point to the root of the mapper required. All keys will be file-names below this location, and their values the contents of each key.

Also accepts compound URLs like zip::s3://bucket/file.zip , see fsspec.open.

Parameters:
url: str

Root URL of mapping

check: bool

Whether to attempt to read from the location before instantiation, to check that the mapping does exist

create: bool

Whether to make the directory corresponding to the root before instantiating

missing_exceptions: None or tuple

If given, these exception types will be regarded as missing keys and return KeyError when trying to read data. By default, you get (FileNotFoundError, IsADirectoryError, NotADirectoryError)

alternate_root: None or str

In cases of complex URLs, the parser may fail to pick the correct part for the mapper root, so this arg can override

Returns:
FSMap instance, the dict-like key-value store.
class fsspec.gui.FileSelector(url=None, filters=None, ignore=None, kwargs=None)[source]

Panel-based graphical file selector widget

Instances of this widget are interactive and can be displayed in jupyter by having them as the output of a cell, or in a separate browser tab using .show().

property fs

Current filesystem instance

open_file(mode='rb', compression=None, encoding=None)[source]

Create OpenFile instance for the currently selected item

For example, in a notebook you might do something like

[ ]: sel = FileSelector(); sel

# user selects their file

[ ]: with sel.open_file('rb') as f:
...      out = f.read()
Parameters:
mode: str (optional)

Open mode for the file.

compression: str (optional)

The interact with the file as compressed. Set to ‘infer’ to guess compression from the file ending

encoding: str (optional)

If using text mode, use this encoding; defaults to UTF8.

property storage_options

Value of the kwargs box as a dictionary

property urlpath

URL of currently selected item

fsspec.open(urlpath, mode='rb', compression=None, encoding='utf8', errors=None, protocol=None, newline=None, expand=None, **kwargs)[source]

Given a path or paths, return one OpenFile object.

Parameters:
urlpath: string or list

Absolute or relative filepath. Prefix with a protocol like s3:// to read from alternative filesystems. Should not include glob character(s).

mode: ‘rb’, ‘wt’, etc.
compression: string or None

If given, open file using compression codec. Can either be a compression name (a key in fsspec.compression.compr) or “infer” to guess the compression from the filename suffix.

encoding: str

For text mode only

errors: None or str

Passed to TextIOWrapper in text mode

protocol: str or None

If given, overrides the protocol found in the URL.

newline: bytes or None

Used for line terminator in text mode. If None, uses system default; if blank, uses no translation.

expand: bool or Nonw

Whether to regard file paths containing special glob characters as needing expansion (finding the first match) or absolute. Setting False allows using paths which do embed such characters. If None (default), this argument takes its value from the DEFAULT_EXPAND module variable, which takes its initial value from the “open_expand” config value at startup, which will be False if not set.

**kwargs: dict

Extra options that make sense to a particular storage connection, e.g. host, port, username, password, etc.

Returns:
OpenFile object.

Notes

For a full list of the available protocols and the implementations that they map across to see the latest online documentation:

Examples

>>> openfile = open('2015-01-01.csv')  
>>> openfile = open(
...     's3://bucket/2015-01-01.csv.gz', compression='gzip'
... )  
>>> with openfile as f:
...     df = pd.read_csv(f)  
...
fsspec.open_files(urlpath, mode='rb', compression=None, encoding='utf8', errors=None, name_function=None, num=1, protocol=None, newline=None, auto_mkdir=True, expand=True, **kwargs)[source]

Given a path or paths, return a list of OpenFile objects.

For writing, a str path must contain the “*” character, which will be filled in by increasing numbers, e.g., “part*” -> “part1”, “part2” if num=2.

For either reading or writing, can instead provide explicit list of paths.

Parameters:
urlpath: string or list

Absolute or relative filepath(s). Prefix with a protocol like s3:// to read from alternative filesystems. To read from multiple files you can pass a globstring or a list of paths, with the caveat that they must all have the same protocol.

mode: ‘rb’, ‘wt’, etc.
compression: string or None

If given, open file using compression codec. Can either be a compression name (a key in fsspec.compression.compr) or “infer” to guess the compression from the filename suffix.

encoding: str

For text mode only

errors: None or str

Passed to TextIOWrapper in text mode

name_function: function or None

if opening a set of files for writing, those files do not yet exist, so we need to generate their names by formatting the urlpath for each sequence number

num: int [1]

if writing mode, number of files we expect to create (passed to name+function)

protocol: str or None

If given, overrides the protocol found in the URL.

newline: bytes or None

Used for line terminator in text mode. If None, uses system default; if blank, uses no translation.

auto_mkdir: bool (True)

If in write mode, this will ensure the target directory exists before writing, by calling fs.mkdirs(exist_ok=True).

expand: bool
**kwargs: dict

Extra options that make sense to a particular storage connection, e.g. host, port, username, password, etc.

Returns:
An OpenFiles instance, which is a list of OpenFile objects that can
be used as a single context

Notes

For a full list of the available protocols and the implementations that they map across to see the latest online documentation:

Examples

>>> files = open_files('2015-*-*.csv')  
>>> files = open_files(
...     's3://bucket/2015-*-*.csv.gz', compression='gzip'
... )
fsspec.open_local(url: str | list[str] | Path | list[Path], mode: str = 'rb', **storage_options: dict) → str | list[str][source]

Open file(s) which can be resolved to local

For files which either are local, or get downloaded upon open (e.g., by file caching)

Parameters:
url: str or list(str)
mode: str

Must be read mode

storage_options:

passed on to FS for or used by open_files (e.g., compression)

Base Classes

fsspec.archive.AbstractArchiveFileSystem(...)

A generic superclass for implementing Archive-based filesystems.

fsspec.asyn.AsyncFileSystem(*args, **kwargs)

Async file operations, default implementations

fsspec.callbacks.Callback([size, value, hooks])

Base class and interface for callback mechanism

fsspec.callbacks.DotPrinterCallback([...])

Simple example Callback implementation

fsspec.callbacks.NoOpCallback([size, value, ...])

This implementation of Callback does exactly nothing

fsspec.callbacks.TqdmCallback([tqdm_kwargs])

A callback to display a progress bar using tqdm

fsspec.core.BaseCache(blocksize, fetcher, size)

Pass-though cache: doesn't keep anything, calls every time

fsspec.core.OpenFile(fs, path[, mode, ...])

File-like object to be used in a context

fsspec.core.OpenFiles(*args[, mode, fs])

List of OpenFile instances

fsspec.core.get_fs_token_paths(urlpath[, ...])

Filesystem, deterministic token, and paths from a urlpath and options.

fsspec.core.url_to_fs(url, **kwargs)

Turn fully-qualified and potentially chained URL into filesystem instance

fsspec.dircache.DirCache([...])

Caching of directory listings, in a structure like.

fsspec.FSMap(root, fs[, check, create, ...])

Wrap a FileSystem instance as a mutable wrapping.

fsspec.generic.GenericFileSystem(*args, **kwargs)

Wrapper over all other FS types

fsspec.registry.register_implementation(...)

Add implementation class to the registry

fsspec.spec.AbstractBufferedFile(fs, path[, ...])

Convenient class to derive from to provide buffering

fsspec.spec.AbstractFileSystem(*args, **kwargs)

An abstract super-class for pythonic file-systems

fsspec.spec.Transaction(fs, **kwargs)

Filesystem transaction write context
class fsspec.archive.AbstractArchiveFileSystem(*args, **kwargs)[source]

A generic superclass for implementing Archive-based filesystems.

Currently, it is shared amongst ZipFileSystem, LibArchiveFileSystem and TarFileSystem.

info(path, **kwargs)[source]

Give details of entry at path

Returns a single dictionary, with exactly the same information as ls would with detail=True.

The default implementation should calls ls and could be overridden by a shortcut. kwargs are passed on to `ls().

Some file systems might not be able to measure the file’s size, in which case, the returned dict will include 'size': None.

Returns:
dict with keys: name (full path in the FS), size (in bytes), type (file,
directory, or something else) and other FS-specific keys.
ls(path, detail=True, **kwargs)[source]

List objects at path.

This should include subdirectories and files at that location. The difference between a file and a directory must be clear when details are requested.

The specific keys, or perhaps a FileInfo class, or similar, is TBD, but must be consistent across implementations. Must include:

  • full path to the entry (without protocol)

  • size of the entry, in bytes. If the value cannot be determined, will be None.

  • type of entry, “file”, “directory” or other

Additional information may be present, appropriate to the file-system, e.g., generation, checksum, etc.

May use refresh=True|False to allow use of self._ls_from_cache to check for a saved listing and avoid calling the backend. This would be common where listing may be expensive.

Parameters:
path: str
detail: bool

if True, gives a list of dictionaries, where each is the same as the result of info(path). If False, gives a list of paths (str).

kwargs: may have additional backend-specific options, such as version

information

Returns:
List of strings if detail is False, or list of directory information
dicts if detail is True.
ukey(path)[source]

Hash of file properties, to tell if it has changed

class fsspec.callbacks.Callback(size=None, value=0, hooks=None, **kwargs)[source]

Base class and interface for callback mechanism

This class can be used directly for monitoring file transfers by providing callback=Callback(hooks=...) (see the hooks argument, below), or subclassed for more specialised behaviour.

Parameters:
size: int (optional)

Nominal quantity for the value that corresponds to a complete transfer, e.g., total number of tiles or total number of bytes

value: int (0)

Starting internal counter value

hooks: dict or None

A dict of named functions to be called on each update. The signature of these must be f(size, value, **kwargs)

absolute_update(value)[source]

Set the internal value state

Triggers call()

Parameters:
value: int
classmethod as_callback(maybe_callback=None)[source]

Transform callback=… into Callback instance

For the special value of None, return the global instance of NoOpCallback. This is an alternative to including callback=DEFAULT_CALLBACK directly in a method signature.

branch(path_1, path_2, kwargs)[source]

Set callbacks for child transfers

If this callback is operating at a higher level, e.g., put, which may trigger transfers that can also be monitored. The passed kwargs are to be mutated to add callback=, if this class supports branching to children.

Parameters:
path_1: str

Child’s source path

path_2: str

Child’s destination path

kwargs: dict

arguments passed to child method, e.g., put_file.

Returns:
branch_coro(fn)[source]

Wraps a coroutine, and pass a new child callback to it.

branched(path_1, path_2, **kwargs)[source]

Return callback for child transfers

If this callback is operating at a higher level, e.g., put, which may trigger transfers that can also be monitored. The function returns a callback that has to be passed to the child method, e.g., put_file, as callback= argument.

The implementation uses callback.branch for compatibility. When implementing callbacks, it is recommended to override this function instead of branch and avoid calling super().branched(...).

Prefer using this function over branch.

Parameters:
path_1: str

Child’s source path

path_2: str

Child’s destination path

**kwargs:

Arbitrary keyword arguments

Returns:
callback: Callback

A callback instance to be passed to the child method

call(hook_name=None, **kwargs)[source]

Execute hook(s) with current state

Each function is passed the internal size and current value

Parameters:
hook_name: str or None

If given, execute on this hook

kwargs: passed on to (all) hook(s)
close()[source]

Close callback.

relative_update(inc=1)[source]

Delta increment the internal counter

Triggers call()

Parameters:
inc: int
set_size(size)[source]

Set the internal maximum size attribute

Usually called if not initially set at instantiation. Note that this triggers a call().

Parameters:
size: int
wrap(iterable)[source]

Wrap an iterable to call relative_update on each iterations

Parameters:
iterable: Iterable

The iterable that is being wrapped

class fsspec.callbacks.DotPrinterCallback(chr_to_print='#', **kwargs)[source]

Simple example Callback implementation

Almost identical to Callback with a hook that prints a char; here we demonstrate how the outer layer may print “#” and the inner layer “.”

branch(path_1, path_2, kwargs)[source]

Mutate kwargs to add new instance with different print char

call(**kwargs)[source]

Just outputs a character

class fsspec.callbacks.NoOpCallback(size=None, value=0, hooks=None, **kwargs)[source]

This implementation of Callback does exactly nothing

call(*args, **kwargs)[source]

Execute hook(s) with current state

Each function is passed the internal size and current value

Parameters:
hook_name: str or None

If given, execute on this hook

kwargs: passed on to (all) hook(s)
class fsspec.callbacks.TqdmCallback(tqdm_kwargs=None, *args, **kwargs)[source]

A callback to display a progress bar using tqdm

Parameters:
tqdm_kwargsdict, (optional)

Any argument accepted by the tqdm constructor. See the tqdm doc. Will be forwarded to tqdm_cls.

tqdm_cls: (optional)

subclass of tqdm.tqdm. If not passed, it will default to tqdm.tqdm.

Examples

>>> import fsspec
>>> from fsspec.callbacks import TqdmCallback
>>> fs = fsspec.filesystem("memory")
>>> path2distant_data = "/your-path"
>>> fs.upload(
        ".",
        path2distant_data,
        recursive=True,
        callback=TqdmCallback(),
    )

You can forward args to tqdm using the tqdm_kwargs parameter.

>>> fs.upload(
        ".",
        path2distant_data,
        recursive=True,
        callback=TqdmCallback(tqdm_kwargs={"desc": "Your tqdm description"}),
    )

You can also customize the progress bar by passing a subclass of tqdm.

class TqdmFormat(tqdm):
    '''Provides a `total_time` format parameter'''
    @property
    def format_dict(self):
        d = super().format_dict
        total_time = d["elapsed"] * (d["total"] or 0) / max(d["n"], 1)
        d.update(total_time=self.format_interval(total_time) + " in total")
        return d

>>> with TqdmCallback(
        tqdm_kwargs={
            "desc": "desc",
            "bar_format": "{total_time}: {percentage:.0f}%|{bar}{r_bar}",
        },
        tqdm_cls=TqdmFormat,
    ) as callback:
        fs.upload(".", path2distant_data, recursive=True, callback=callback)
call(*args, **kwargs)[source]

Execute hook(s) with current state

Each function is passed the internal size and current value

Parameters:
hook_name: str or None

If given, execute on this hook

kwargs: passed on to (all) hook(s)
close()[source]

Close callback.

class fsspec.core.BaseCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int)[source]

Pass-though cache: doesn’t keep anything, calls every time

Acts as base class for other cachers

Parameters:
blocksize: int

How far to read ahead in numbers of bytes

fetcher: func

Function of the form f(start, end) which gets bytes from remote as specified

size: int

How big this file is

class fsspec.core.OpenFile(fs, path, mode='rb', compression=None, encoding=None, errors=None, newline=None)[source]

File-like object to be used in a context

Can layer (buffered) text-mode and compression over any file-system, which are typically binary-only.

These instances are safe to serialize, as the low-level file object is not created until invoked using with.

Parameters:
fs: FileSystem

The file system to use for opening the file. Should be a subclass or duck-type with fsspec.spec.AbstractFileSystem

path: str

Location to open

mode: str like ‘rb’, optional

Mode of the opened file

compression: str or None, optional

Compression to apply

encoding: str or None, optional

The encoding to use if opened in text mode.

errors: str or None, optional

How to handle encoding errors if opened in text mode.

newline: None or str

Passed to TextIOWrapper in text mode, how to handle line endings.

autoopen: bool

If True, calls open() immediately. Mostly used by pickle

pos: int

If given and autoopen is True, seek to this location immediately

close()[source]

Close all encapsulated file objects

open()[source]

Materialise this as a real open file without context

The OpenFile object should be explicitly closed to avoid enclosed file instances persisting. You must, therefore, keep a reference to the OpenFile during the life of the file-like it generates.

class fsspec.core.OpenFiles(*args, mode='rb', fs=None)[source]

List of OpenFile instances

Can be used in a single context, which opens and closes all of the contained files. Normal list access to get the elements works as normal.

A special case is made for caching filesystems - the files will be down/uploaded together at the start or end of the context, and this may happen concurrently, if the target filesystem supports it.

fsspec.core.get_fs_token_paths(urlpath, mode='rb', num=1, name_function=None, storage_options=None, protocol=None, expand=True)[source]

Filesystem, deterministic token, and paths from a urlpath and options.

Parameters:
urlpath: string or iterable

Absolute or relative filepath, URL (may include protocols like s3://), or globstring pointing to data.

mode: str, optional

Mode in which to open files.

num: int, optional

If opening in writing mode, number of files we expect to create.

name_function: callable, optional

If opening in writing mode, this callable is used to generate path names. Names are generated for each partition by urlpath.replace('*', name_function(partition_index)).

storage_options: dict, optional

Additional keywords to pass to the filesystem class.

protocol: str or None

To override the protocol specifier in the URL

expand: bool

Expand string paths for writing, assuming the path is a directory

fsspec.core.url_to_fs(url, **kwargs)[source]

Turn fully-qualified and potentially chained URL into filesystem instance

Parameters:
urlstr

The fsspec-compatible URL

**kwargs: dict

Extra options that make sense to a particular storage connection, e.g. host, port, username, password, etc.

Returns:
filesystemFileSystem

The new filesystem discovered from url and created with **kwargs.

urlpathstr

The file-systems-specific URL for url.

class fsspec.dircache.DirCache(use_listings_cache=True, listings_expiry_time=None, max_paths=None, **kwargs)[source]

Caching of directory listings, in a structure like:

{"path0": [
    {"name": "path0/file0",
     "size": 123,
     "type": "file",
     ...
    },
    {"name": "path0/file1",
    },
    ...
    ],
 "path1": [...]
}

Parameters to this class control listing expiry or indeed turn caching off

__init__(use_listings_cache=True, listings_expiry_time=None, max_paths=None, **kwargs)[source]
Parameters:
use_listings_cache: bool

If False, this cache never returns items, but always reports KeyError, and setting items has no effect

listings_expiry_time: int or float (optional)

Time in seconds that a listing is considered valid. If None, listings do not expire.

max_paths: int (optional)

The number of most recent listings that are considered valid; ‘recent’ refers to when the entry was set.

class fsspec.FSMap(root, fs, check=False, create=False, missing_exceptions=None)[source]

Wrap a FileSystem instance as a mutable wrapping.

The keys of the mapping become files under the given root, and the values (which must be bytes) the contents of those files.

Parameters:
root: string

prefix for all the files

fs: FileSystem instance
check: bool (=True)

performs a touch at the location, to check for write access.

Examples

>>> fs = FileSystem(**parameters)  
>>> d = FSMap('my-data/path/', fs)  
or, more likely
>>> d = fs.get_mapper('my-data/path/')

>>> d['loc1'] = b'Hello World'  
>>> list(d.keys())  
['loc1']
>>> d['loc1']  
b'Hello World'
clear()[source]

Remove all keys below root - empties out mapping

delitems(keys)[source]

Remove multiple keys from the store

property dirfs

dirfs instance that can be used with the same keys as the mapper

getitems(keys, on_error='raise')[source]

Fetch multiple items from the store

If the backend is async-able, this might proceed concurrently

Parameters:
keys: list(str)

They keys to be fetched

on_error“raise”, “omit”, “return”

If raise, an underlying exception will be raised (converted to KeyError if the type is in self.missing_exceptions); if omit, keys with exception will simply not be included in the output; if “return”, all keys are included in the output, but the value will be bytes or an exception instance.

Returns:
dict(key, bytes|exception)
pop(key, default=None)[source]

Pop data

setitems(values_dict)[source]

Set the values of multiple items in the store

Parameters:
values_dict: dict(str, bytes)
class fsspec.generic.GenericFileSystem(*args, **kwargs)[source]

Wrapper over all other FS types

<experimental!>

This implementation is a single unified interface to be able to run FS operations over generic URLs, and dispatch to the specific implementations using the URL protocol prefix.

Note: instances of this FS are always async, even if you never use it with any async backend.

fsspec.registry.register_implementation(name, cls, clobber=False, errtxt=None)[source]

Add implementation class to the registry

Parameters:
name: str

Protocol name to associate with the class

cls: class or str

if a class: fsspec-compliant implementation class (normally inherits from fsspec.AbstractFileSystem, gets added straight to the registry. If a str, the full path to an implementation class like package.module.class, which gets added to known_implementations, so the import is deferred until the filesystem is actually used.

clobber: bool (optional)

Whether to overwrite a protocol with the same name; if False, will raise instead.

errtxt: str (optional)

If given, then a failure to import the given class will result in this text being given.

class fsspec.spec.AbstractBufferedFile(fs, path, mode='rb', block_size='default', autocommit=True, cache_type='readahead', cache_options=None, size=None, **kwargs)[source]

Convenient class to derive from to provide buffering

In the case that the backend does not provide a pythonic file-like object already, this class contains much of the logic to build one. The only methods that need to be overridden are _upload_chunk, _initiate_upload and _fetch_range.

close()[source]

Close file

Finalizes writes, discards cache

commit()[source]

Move from temp to final destination

discard()[source]

Throw away temporary file

flush(force=False)[source]

Write buffered data to backend store.

Writes the current buffer, if it is larger than the block-size, or if the file is being closed.

Parameters:
force: bool

When closing, write the last block even if it is smaller than blocks are allowed to be. Disallows further writing to this file.

info()[source]

File information about this path

read(length=-1)[source]

Return data from cache, or fetch pieces as necessary

Parameters:
length: int (-1)

Number of bytes to read; if <0, all remaining bytes.

readable()[source]

Whether opened for reading

readinto(b)[source]

mirrors builtin file’s readinto method

https://docs.python.org/3/library/io.html#io.RawIOBase.readinto

readline()[source]

Read until first occurrence of newline character

Note that, because of character encoding, this is not necessarily a true line ending.

readlines()[source]

Return all data, split by the newline character

readuntil(char=b'\n', blocks=None)[source]

Return data between current position and first occurrence of char

char is included in the output, except if the end of the tile is encountered first.

Parameters:
char: bytes

Thing to find

blocks: None or int

How much to read in each go. Defaults to file blocksize - which may mean a new read on every call.

seek(loc, whence=0)[source]

Set current file location

Parameters:
loc: int

byte location

whence: {0, 1, 2}

from start of file, current location or end of file, resp.

seekable()[source]

Whether is seekable (only in read mode)

tell()[source]

Current file location

writable()[source]

Whether opened for writing

write(data)[source]

Write data to buffer.

Buffer only sent on flush() or if buffer is greater than or equal to blocksize.

Parameters:
data: bytes

Set of bytes to be written.

class fsspec.spec.AbstractFileSystem(*args, **kwargs)[source]

An abstract super-class for pythonic file-systems

Implementations are expected to be compatible with or, better, subclass from here.

cat(path, recursive=False, on_error='raise', **kwargs)[source]

Fetch (potentially multiple) paths’ contents

Parameters:
recursive: bool

If True, assume the path(s) are directories, and get all the contained files

on_error“raise”, “omit”, “return”

If raise, an underlying exception will be raised (converted to KeyError if the type is in self.missing_exceptions); if omit, keys with exception will simply not be included in the output; if “return”, all keys are included in the output, but the value will be bytes or an exception instance.

kwargs: passed to cat_file
Returns:
dict of {path: contents} if there are multiple paths
or the path has been otherwise expanded
cat_file(path, start=None, end=None, **kwargs)[source]

Get the content of a file

Parameters:
path: URL of file on this filesystems
start, end: int

Bytes limits of the read. If negative, backwards from end, like usual python slices. Either can be None for start or end of file, respectively

kwargs: passed to ``open()``.
cat_ranges(paths, starts, ends, max_gap=None, on_error='return', **kwargs)[source]

Get the contents of byte ranges from one or more files

Parameters:
paths: list

A list of of filepaths on this filesystems

starts, ends: int or list

Bytes limits of the read. If using a single int, the same value will be used to read all the specified files.

checksum(path)[source]

Unique value for current version of file

If the checksum is the same from one moment to another, the contents are guaranteed to be the same. If the checksum changes, the contents might have changed.

This should normally be overridden; default will probably capture creation/modification timestamp (which would be good) or maybe access timestamp (which would be bad)

classmethod clear_instance_cache()[source]

Clear the cache of filesystem instances.

Notes

Unless overridden by setting the cachable class attribute to False, the filesystem class stores a reference to newly created instances. This prevents Python’s normal rules around garbage collection from working, since the instances refcount will not drop to zero until clear_instance_cache is called.

copy(path1, path2, recursive=False, maxdepth=None, on_error=None, **kwargs)[source]

Copy within two locations in the filesystem

on_error“raise”, “ignore”

If raise, any not-found exceptions will be raised; if ignore any not-found exceptions will cause the path to be skipped; defaults to raise unless recursive is true, where the default is ignore

cp(path1, path2, **kwargs)[source]

Alias of AbstractFileSystem.copy.

created(path)[source]

Return the created timestamp of a file as a datetime.datetime

classmethod current()[source]

Return the most recently instantiated FileSystem

If no instance has been created, then create one with defaults

delete(path, recursive=False, maxdepth=None)[source]

Alias of AbstractFileSystem.rm.

disk_usage(path, total=True, maxdepth=None, **kwargs)[source]

Alias of AbstractFileSystem.du.

download(rpath, lpath, recursive=False, **kwargs)[source]

Alias of AbstractFileSystem.get.

du(path, total=True, maxdepth=None, withdirs=False, **kwargs)[source]

Space used by files and optionally directories within a path

Directory size does not include the size of its contents.

Parameters:
path: str
total: bool

Whether to sum all the file sizes

maxdepth: int or None

Maximum number of directory levels to descend, None for unlimited.

withdirs: bool

Whether to include directory paths in the output.

kwargs: passed to ``find``
Returns:
Dict of {path: size} if total=False, or int otherwise, where numbers
refer to bytes used.
end_transaction()[source]

Finish write transaction, non-context version

exists(path, **kwargs)[source]

Is there a file at the given path

expand_path(path, recursive=False, maxdepth=None, **kwargs)[source]

Turn one or more globs or directories into a list of all matching paths to files or directories.

kwargs are passed to glob or find, which may in turn call ls

find(path, maxdepth=None, withdirs=False, detail=False, **kwargs)[source]

List all files below path.

Like posix find command without conditions

Parameters:
pathstr
maxdepth: int or None

If not None, the maximum number of levels to descend

withdirs: bool

Whether to include directory paths in the output. This is True when used by glob, but users usually only want files.

kwargs are passed to ``ls``.
static from_dict(dct: Dict[str, Any]) → AbstractFileSystem[source]

Recreate a filesystem instance from dictionary representation.

See .to_dict() for the expected structure of the input.

Parameters:
dct: Dict[str, Any]
Returns:
file system instance, not necessarily of this particular class.

Warning

This can import arbitrary modules (as determined by the cls key). Make sure you haven’t installed any modules that may execute malicious code at import time.

static from_json(blob: str) → AbstractFileSystem[source]

Recreate a filesystem instance from JSON representation.

See .to_json() for the expected structure of the input.

Parameters:
blob: str
Returns:
file system instance, not necessarily of this particular class.

Warning

This can import arbitrary modules (as determined by the cls key). Make sure you haven’t installed any modules that may execute malicious code at import time.

property fsid

Persistent filesystem id that can be used to compare filesystems across sessions.

get(rpath, lpath, recursive=False, callback=<fsspec.callbacks.NoOpCallback object>, maxdepth=None, **kwargs)[source]

Copy file(s) to local.

Copies a specific file or tree of files (if recursive=True). If lpath ends with a “/”, it will be assumed to be a directory, and target files will go within. Can submit a list of paths, which may be glob-patterns and will be expanded.

Calls get_file for each source.

get_file(rpath, lpath, callback=<fsspec.callbacks.NoOpCallback object>, outfile=None, **kwargs)[source]

Copy single remote file to local

get_mapper(root='', check=False, create=False, missing_exceptions=None)[source]

Create key/value store based on this file-system

Makes a MutableMapping interface to the FS at the given root path. See fsspec.mapping.FSMap for further details.

glob(path, maxdepth=None, **kwargs)[source]

Find files by glob-matching.

If the path ends with ‘/’, only folders are returned.

We support "**", "?" and "[..]". We do not support ^ for pattern negation.

The maxdepth option is applied on the first ** found in the path.

kwargs are passed to ls.

head(path, size=1024)[source]

Get the first size bytes from file

info(path, **kwargs)[source]

Give details of entry at path

Returns a single dictionary, with exactly the same information as ls would with detail=True.

The default implementation should calls ls and could be overridden by a shortcut. kwargs are passed on to `ls().

Some file systems might not be able to measure the file’s size, in which case, the returned dict will include 'size': None.

Returns:
dict with keys: name (full path in the FS), size (in bytes), type (file,
directory, or something else) and other FS-specific keys.
invalidate_cache(path=None)[source]

Discard any cached directory information

Parameters:
path: string or None

If None, clear all listings cached else listings at or under given path.

isdir(path)[source]

Is this entry directory-like?

isfile(path)[source]

Is this entry file-like?

lexists(path, **kwargs)[source]

If there is a file at the given path (including broken links)

listdir(path, detail=True, **kwargs)[source]

Alias of AbstractFileSystem.ls.

ls(path, detail=True, **kwargs)[source]

List objects at path.

This should include subdirectories and files at that location. The difference between a file and a directory must be clear when details are requested.

The specific keys, or perhaps a FileInfo class, or similar, is TBD, but must be consistent across implementations. Must include:

  • full path to the entry (without protocol)

  • size of the entry, in bytes. If the value cannot be determined, will be None.

  • type of entry, “file”, “directory” or other

Additional information may be present, appropriate to the file-system, e.g., generation, checksum, etc.

May use refresh=True|False to allow use of self._ls_from_cache to check for a saved listing and avoid calling the backend. This would be common where listing may be expensive.

Parameters:
path: str
detail: bool

if True, gives a list of dictionaries, where each is the same as the result of info(path). If False, gives a list of paths (str).

kwargs: may have additional backend-specific options, such as version

information

Returns:
List of strings if detail is False, or list of directory information
dicts if detail is True.
makedir(path, create_parents=True, **kwargs)[source]

Alias of AbstractFileSystem.mkdir.

makedirs(path, exist_ok=False)[source]

Recursively make directories

Creates directory at path and any intervening required directories. Raises exception if, for instance, the path already exists but is a file.

Parameters:
path: str

leaf directory name

exist_ok: bool (False)

If False, will error if the target already exists

mkdir(path, create_parents=True, **kwargs)[source]

Create directory entry at path

For systems that don’t have true directories, may create an for this instance only and not touch the real filesystem

Parameters:
path: str

location

create_parents: bool

if True, this is equivalent to makedirs

kwargs:

may be permissions, etc.

mkdirs(path, exist_ok=False)[source]

Alias of AbstractFileSystem.makedirs.

modified(path)[source]

Return the modified timestamp of a file as a datetime.datetime

move(path1, path2, **kwargs)[source]

Alias of AbstractFileSystem.mv.

mv(path1, path2, recursive=False, maxdepth=None, **kwargs)[source]

Move file(s) from one location to another

open(path, mode='rb', block_size=None, cache_options=None, compression=None, **kwargs)[source]

Return a file-like object from the filesystem

The resultant instance must function correctly in a context with block.

Parameters:
path: str

Target file

mode: str like ‘rb’, ‘w’

See builtin open()

block_size: int

Some indication of buffering - this is a value in bytes

cache_optionsdict, optional

Extra arguments to pass through to the cache.

compression: string or None

If given, open file using compression codec. Can either be a compression name (a key in fsspec.compression.compr) or “infer” to guess the compression from the filename suffix.

encoding, errors, newline: passed on to TextIOWrapper for text mode
pipe(path, value=None, **kwargs)[source]

Put value into path

(counterpart to cat)

Parameters:
path: string or dict(str, bytes)

If a string, a single remote location to put value bytes; if a dict, a mapping of {path: bytesvalue}.

value: bytes, optional

If using a single path, these are the bytes to put there. Ignored if path is a dict

pipe_file(path, value, **kwargs)[source]

Set the bytes of given file

put(lpath, rpath, recursive=False, callback=<fsspec.callbacks.NoOpCallback object>, maxdepth=None, **kwargs)[source]

Copy file(s) from local.

Copies a specific file or tree of files (if recursive=True). If rpath ends with a “/”, it will be assumed to be a directory, and target files will go within.

Calls put_file for each source.

put_file(lpath, rpath, callback=<fsspec.callbacks.NoOpCallback object>, **kwargs)[source]

Copy single file to remote

read_block(fn, offset, length, delimiter=None)[source]

Read a block of bytes from

Starting at offset of the file, read length bytes. If delimiter is set then we ensure that the read starts and stops at delimiter boundaries that follow the locations offset and offset + length. If offset is zero then we start at zero. The bytestring returned WILL include the end delimiter string.

If offset+length is beyond the eof, reads to eof.

Parameters:
fn: string

Path to filename

offset: int

Byte offset to start read

length: int

Number of bytes to read. If None, read to end.

delimiter: bytes (optional)

Ensure reading starts and stops at delimiter bytestring

See also

fsspec.utils.read_block()

Examples

>>> fs.read_block('data/file.csv', 0, 13)  
b'Alice, 100\nBo'
>>> fs.read_block('data/file.csv', 0, 13, delimiter=b'\n')  
b'Alice, 100\nBob, 200\n'

Use length=None to read to the end of the file. >>> fs.read_block(‘data/file.csv’, 0, None, delimiter=b’n’) # doctest: +SKIP b’Alice, 100nBob, 200nCharlie, 300’

read_bytes(path, start=None, end=None, **kwargs)[source]

Alias of AbstractFileSystem.cat_file.

read_text(path, encoding=None, errors=None, newline=None, **kwargs)[source]

Get the contents of the file as a string.

Parameters:
path: str

URL of file on this filesystems

encoding, errors, newline: same as `open`.
rename(path1, path2, **kwargs)[source]

Alias of AbstractFileSystem.mv.

rm(path, recursive=False, maxdepth=None)[source]

Delete files.

Parameters:
path: str or list of str

File(s) to delete.

recursive: bool

If file(s) are directories, recursively delete contents and then also remove the directory

maxdepth: int or None

Depth to pass to walk for finding files to delete, if recursive. If None, there will be no limit and infinite recursion may be possible.

rm_file(path)[source]

Delete a file

rmdir(path)[source]

Remove a directory, if empty

sign(path, expiration=100, **kwargs)[source]

Create a signed URL representing the given path

Some implementations allow temporary URLs to be generated, as a way of delegating credentials.

Parameters:
pathstr

The path on the filesystem

expirationint

Number of seconds to enable the URL for (if supported)

Returns:
URLstr

The signed URL

Raises:
NotImplementedErrorif method is not implemented for a filesystem
size(path)[source]

Size in bytes of file

sizes(paths)[source]

Size in bytes of each file in a list of paths

start_transaction()[source]

Begin write transaction for deferring files, non-context version

stat(path, **kwargs)[source]

Alias of AbstractFileSystem.info.

tail(path, size=1024)[source]

Get the last size bytes from file

to_dict(*, include_password: bool = True) → Dict[str, Any][source]

JSON-serializable dictionary representation of this filesystem instance.

Parameters:
include_password: bool, default True

Whether to include the password (if any) in the output.

Returns:
Dictionary with keys cls (the python location of this class),
protocol (text name of this class’s protocol, first one in case of
multiple), args (positional args, usually empty), and all other
keyword arguments as their own keys.

Warning

Serialized filesystems may contain sensitive information which have been passed to the constructor, such as passwords and tokens. Make sure you store and send them in a secure environment!

to_json(*, include_password: bool = True) → str[source]

JSON representation of this filesystem instance.

Parameters:
include_password: bool, default True

Whether to include the password (if any) in the output.

Returns:
JSON string with keys cls (the python location of this class),
protocol (text name of this class’s protocol, first one in case of
multiple), args (positional args, usually empty), and all other
keyword arguments as their own keys.

Warning

Serialized filesystems may contain sensitive information which have been passed to the constructor, such as passwords and tokens. Make sure you store and send them in a secure environment!

touch(path, truncate=True, **kwargs)[source]

Create empty file, or update timestamp

Parameters:
path: str

file location

truncate: bool

If True, always set file size to 0; if False, update timestamp and leave file unchanged, if backend allows this

property transaction

A context within which files are committed together upon exit

Requires the file class to implement commit() and discard() for the normal and exception cases.

transaction_type

alias of Transaction

ukey(path)[source]

Hash of file properties, to tell if it has changed

unstrip_protocol(name: str) → str[source]

Format FS-specific path to generic, including protocol

upload(lpath, rpath, recursive=False, **kwargs)[source]

Alias of AbstractFileSystem.put.

walk(path, maxdepth=None, topdown=True, on_error='omit', **kwargs)[source]

Return all files belows path

List all files, recursing into subdirectories; output is iterator-style, like os.walk(). For a simple list of files, find() is available.

When topdown is True, the caller can modify the dirnames list in-place (perhaps using del or slice assignment), and walk() will only recurse into the subdirectories whose names remain in dirnames; this can be used to prune the search, impose a specific order of visiting, or even to inform walk() about directories the caller creates or renames before it resumes walk() again. Modifying dirnames when topdown is False has no effect. (see os.walk)

Note that the “files” outputted will include anything that is not a directory, such as links.

Parameters:
path: str

Root to recurse into

maxdepth: int

Maximum recursion depth. None means limitless, but not recommended on link-based file-systems.

topdown: bool (True)

Whether to walk the directory tree from the top downwards or from the bottom upwards.

on_error: “omit”, “raise”, a collable

if omit (default), path with exception will simply be empty; If raise, an underlying exception will be raised; if callable, it will be called with a single OSError instance as argument

kwargs: passed to ``ls``
write_bytes(path, value, **kwargs)[source]

Alias of AbstractFileSystem.pipe_file.

write_text(path, value, encoding=None, errors=None, newline=None, **kwargs)[source]

Write the text to the given file.

An existing file will be overwritten.

Parameters:
path: str

URL of file on this filesystems

value: str

Text to write.

encoding, errors, newline: same as `open`.
class fsspec.spec.Transaction(fs, **kwargs)[source]

Filesystem transaction write context

Gathers files for deferred commit or discard, so that several write operations can be finalized semi-atomically. This works by having this instance as the .transaction attribute of the given filesystem

complete(commit=True)[source]

Finish transaction: commit or discard all deferred files

start()[source]

Start a transaction on this FileSystem

Built-in Implementations

fsspec.implementations.arrow.ArrowFSWrapper(...)

FSSpec-compatible wrapper of pyarrow.fs.FileSystem.

fsspec.implementations.arrow.HadoopFileSystem(...)

A wrapper on top of the pyarrow.fs.HadoopFileSystem to connect it's interface with fsspec

fsspec.implementations.cached.CachingFileSystem(...)

Locally caching filesystem, layer over any other FS

fsspec.implementations.cached.SimpleCacheFileSystem(...)

Caches whole remote files on first access

fsspec.implementations.cached.WholeFileCacheFileSystem(...)

Caches whole remote files on first access

fsspec.implementations.dask.DaskWorkerFileSystem(...)

View files accessible to a worker as any other remote file-system

fsspec.implementations.data.DataFileSystem(...)

A handy decoder for data-URLs

fsspec.implementations.dbfs.DatabricksFileSystem(...)

Get access to the Databricks filesystem implementation over HTTP.

fsspec.implementations.dirfs.DirFileSystem(...)

Directory prefix filesystem

fsspec.implementations.ftp.FTPFileSystem(...)

A filesystem over classic FTP

fsspec.implementations.git.GitFileSystem(...)

Browse the files of a local git repo at any hash/tag/branch

fsspec.implementations.github.GithubFileSystem(...)

Interface to files in github

fsspec.implementations.http.HTTPFileSystem(...)

Simple File-System for fetching data via HTTP(S)

fsspec.implementations.jupyter.JupyterFileSystem(...)

View of the files as seen by a Jupyter server (notebook or lab)

fsspec.implementations.libarchive.LibArchiveFileSystem(...)

Compressed archives as a file-system (read-only)

fsspec.implementations.local.LocalFileSystem(...)

Interface to files on local storage

fsspec.implementations.memory.MemoryFileSystem(...)

A filesystem based on a dict of BytesIO objects

fsspec.implementations.reference.ReferenceFileSystem(...)

View byte ranges of some other file as a file system Initial version: single file system target, which must support async, and must allow start and end args in _cat_file.

fsspec.implementations.reference.LazyReferenceMapper(root)

This interface can be used to read/write references from Parquet stores.

fsspec.implementations.sftp.SFTPFileSystem(...)

Files over SFTP/SSH

fsspec.implementations.smb.SMBFileSystem(...)

Allow reading and writing to Windows and Samba network shares.

fsspec.implementations.tar.TarFileSystem(...)

Compressed Tar archives as a file-system (read-only)

fsspec.implementations.webhdfs.WebHDFS(...)

Interface to HDFS over HTTP using the WebHDFS API.

fsspec.implementations.zip.ZipFileSystem(...)

Read/Write contents of ZIP archive as a file-system
class fsspec.implementations.arrow.ArrowFSWrapper(*args, **kwargs)[source]

FSSpec-compatible wrapper of pyarrow.fs.FileSystem.

Parameters:
fspyarrow.fs.FileSystem
__init__(fs, **kwargs)[source]

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.arrow.HadoopFileSystem(*args, **kwargs)[source]

A wrapper on top of the pyarrow.fs.HadoopFileSystem to connect it’s interface with fsspec

__init__(host='default', port=0, user=None, kerb_ticket=None, replication=3, extra_conf=None, **kwargs)[source]
Parameters:
host: str

Hostname, IP or “default” to try to read from Hadoop config

port: int

Port to connect on, or default from Hadoop config if 0

user: str or None

If given, connect as this username

kerb_ticket: str or None

If given, use this ticket for authentication

replication: int

set replication factor of file for write operations. default value is 3.

extra_conf: None or dict

Passed on to HadoopFileSystem

class fsspec.implementations.cached.CachingFileSystem(*args, **kwargs)[source]

Locally caching filesystem, layer over any other FS

This class implements chunk-wise local storage of remote files, for quick access after the initial download. The files are stored in a given directory with hashes of URLs for the filenames. If no directory is given, a temporary one is used, which should be cleaned up by the OS after the process ends. The files themselves are sparse (as implemented in MMapCache), so only the data which is accessed takes up space.

Restrictions:

  • the block-size must be the same for each access of a given file, unless all blocks of the file have already been read

  • caching can only be applied to file-systems which produce files derived from fsspec.spec.AbstractBufferedFile ; LocalFileSystem is also allowed, for testing

__init__(target_protocol=None, cache_storage='TMP', cache_check=10, check_files=False, expiry_time=604800, target_options=None, fs=None, same_names: bool | None = None, compression=None, cache_mapper: AbstractCacheMapper | None = None, **kwargs)[source]
Parameters:
target_protocol: str (optional)

Target filesystem protocol. Provide either this or fs.

cache_storage: str or list(str)

Location to store files. If “TMP”, this is a temporary directory, and will be cleaned up by the OS when this process ends (or later). If a list, each location will be tried in the order given, but only the last will be considered writable.

cache_check: int

Number of seconds between reload of cache metadata

check_files: bool

Whether to explicitly see if the UID of the remote file matches the stored one before using. Warning: some file systems such as HTTP cannot reliably give a unique hash of the contents of some path, so be sure to set this option to False.

expiry_time: int

The time in seconds after which a local copy is considered useless. Set to falsy to prevent expiry. The default is equivalent to one week.

target_options: dict or None

Passed to the instantiation of the FS, if fs is None.

fs: filesystem instance

The target filesystem to run against. Provide this or protocol.

same_names: bool (optional)

By default, target URLs are hashed using a HashCacheMapper so that files from different backends with the same basename do not conflict. If this argument is true, a BasenameCacheMapper is used instead. Other cache mapper options are available by using the cache_mapper keyword argument. Only one of this and cache_mapper should be specified.

compression: str (optional)

To decompress on download. Can be ‘infer’ (guess from the URL name), one of the entries in fsspec.compression.compr, or None for no decompression.

cache_mapper: AbstractCacheMapper (optional)

The object use to map from original filenames to cached filenames. Only one of this and same_names should be specified.

class fsspec.implementations.cached.SimpleCacheFileSystem(*args, **kwargs)[source]

Caches whole remote files on first access

This class is intended as a layer over any other file system, and will make a local copy of each file accessed, so that all subsequent reads are local. This implementation only copies whole files, and does not keep any metadata about the download time or file details. It is therefore safer to use in multi-threaded/concurrent situations.

This is the only of the caching filesystems that supports write: you will be given a real local open file, and upon close and commit, it will be uploaded to the target filesystem; the writability or the target URL is not checked until that time.

__init__(**kwargs)[source]
Parameters:
target_protocol: str (optional)

Target filesystem protocol. Provide either this or fs.

cache_storage: str or list(str)

Location to store files. If “TMP”, this is a temporary directory, and will be cleaned up by the OS when this process ends (or later). If a list, each location will be tried in the order given, but only the last will be considered writable.

cache_check: int

Number of seconds between reload of cache metadata

check_files: bool

Whether to explicitly see if the UID of the remote file matches the stored one before using. Warning: some file systems such as HTTP cannot reliably give a unique hash of the contents of some path, so be sure to set this option to False.

expiry_time: int

The time in seconds after which a local copy is considered useless. Set to falsy to prevent expiry. The default is equivalent to one week.

target_options: dict or None

Passed to the instantiation of the FS, if fs is None.

fs: filesystem instance

The target filesystem to run against. Provide this or protocol.

same_names: bool (optional)

By default, target URLs are hashed using a HashCacheMapper so that files from different backends with the same basename do not conflict. If this argument is true, a BasenameCacheMapper is used instead. Other cache mapper options are available by using the cache_mapper keyword argument. Only one of this and cache_mapper should be specified.

compression: str (optional)

To decompress on download. Can be ‘infer’ (guess from the URL name), one of the entries in fsspec.compression.compr, or None for no decompression.

cache_mapper: AbstractCacheMapper (optional)

The object use to map from original filenames to cached filenames. Only one of this and same_names should be specified.

class fsspec.implementations.cached.WholeFileCacheFileSystem(*args, **kwargs)[source]

Caches whole remote files on first access

This class is intended as a layer over any other file system, and will make a local copy of each file accessed, so that all subsequent reads are local. This is similar to CachingFileSystem, but without the block-wise functionality and so can work even when sparse files are not allowed. See its docstring for definition of the init arguments.

The class still needs access to the remote store for listing files, and may refresh cached files.

__init__(target_protocol=None, cache_storage='TMP', cache_check=10, check_files=False, expiry_time=604800, target_options=None, fs=None, same_names: bool | None = None, compression=None, cache_mapper: AbstractCacheMapper | None = None, **kwargs)
Parameters:
target_protocol: str (optional)

Target filesystem protocol. Provide either this or fs.

cache_storage: str or list(str)

Location to store files. If “TMP”, this is a temporary directory, and will be cleaned up by the OS when this process ends (or later). If a list, each location will be tried in the order given, but only the last will be considered writable.

cache_check: int

Number of seconds between reload of cache metadata

check_files: bool

Whether to explicitly see if the UID of the remote file matches the stored one before using. Warning: some file systems such as HTTP cannot reliably give a unique hash of the contents of some path, so be sure to set this option to False.

expiry_time: int

The time in seconds after which a local copy is considered useless. Set to falsy to prevent expiry. The default is equivalent to one week.

target_options: dict or None

Passed to the instantiation of the FS, if fs is None.

fs: filesystem instance

The target filesystem to run against. Provide this or protocol.

same_names: bool (optional)

By default, target URLs are hashed using a HashCacheMapper so that files from different backends with the same basename do not conflict. If this argument is true, a BasenameCacheMapper is used instead. Other cache mapper options are available by using the cache_mapper keyword argument. Only one of this and cache_mapper should be specified.

compression: str (optional)

To decompress on download. Can be ‘infer’ (guess from the URL name), one of the entries in fsspec.compression.compr, or None for no decompression.

cache_mapper: AbstractCacheMapper (optional)

The object use to map from original filenames to cached filenames. Only one of this and same_names should be specified.

class fsspec.implementations.dask.DaskWorkerFileSystem(*args, **kwargs)[source]

View files accessible to a worker as any other remote file-system

When instances are run on the worker, uses the real filesystem. When run on the client, they call the worker to provide information or data.

Warning this implementation is experimental, and read-only for now.

__init__(target_protocol=None, target_options=None, fs=None, client=None, **kwargs)[source]

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.data.DataFileSystem(*args, **kwargs)[source]

A handy decoder for data-URLs

__init__(**kwargs)[source]

No parameters for this filesystem

class fsspec.implementations.dbfs.DatabricksFileSystem(*args, **kwargs)[source]

Get access to the Databricks filesystem implementation over HTTP. Can be used inside and outside of a databricks cluster.

__init__(instance, token, **kwargs)[source]

Create a new DatabricksFileSystem.

Parameters:
instance: str

The instance URL of the databricks cluster. For example for an Azure databricks cluster, this has the form adb-<some-number>.<two digits>.azuredatabricks.net.

token: str

Your personal token. Find out more here: https://docs.databricks.com/dev-tools/api/latest/authentication.html

class fsspec.implementations.dirfs.DirFileSystem(*args, **kwargs)[source]

Directory prefix filesystem

The DirFileSystem is a filesystem-wrapper. It assumes every path it is dealing with is relative to the path. After performing the necessary paths operation it delegates everything to the wrapped filesystem.

__init__(path=None, fs=None, fo=None, target_protocol=None, target_options=None, **storage_options)[source]
Parameters:
path: str

Path to the directory.

fs: AbstractFileSystem

An instantiated filesystem to wrap.

target_protocol, target_options:

if fs is none, construct it from these

fo: str

Alternate for path; do not provide both

class fsspec.implementations.ftp.FTPFileSystem(*args, **kwargs)[source]

A filesystem over classic FTP

__init__(host, port=21, username=None, password=None, acct=None, block_size=None, tempdir=None, timeout=30, encoding='utf-8', **kwargs)[source]

You can use _get_kwargs_from_urls to get some kwargs from a reasonable FTP url.

Authentication will be anonymous if username/password are not given.

Parameters:
host: str

The remote server name/ip to connect to

port: int

Port to connect with

username: str or None

If authenticating, the user’s identifier

password: str of None

User’s password on the server, if using

acct: str or None

Some servers also need an “account” string for auth

block_size: int or None

If given, the read-ahead or write buffer size.

tempdir: str

Directory on remote to put temporary files when in a transaction

timeout: int

Timeout of the ftp connection in seconds

encoding: str

Encoding to use for directories and filenames in FTP connection

class fsspec.implementations.git.GitFileSystem(*args, **kwargs)[source]

Browse the files of a local git repo at any hash/tag/branch

(experimental backend)

__init__(path=None, fo=None, ref=None, **kwargs)[source]
Parameters:
path: str (optional)

Local location of the repo (uses current directory if not given). May be deprecated in favour of fo. When used with a higher level function such as fsspec.open(), may be of the form “git://[path-to-repo[:]][ref@]path/to/file” (but the actual file path should not contain “@” or “:”).

fo: str (optional)

Same as path, but passed as part of a chained URL. This one takes precedence if both are given.

ref: str (optional)

Reference to work with, could be a hash, tag or branch name. Defaults to current working tree. Note that ls and open also take hash, so this becomes the default for those operations

kwargs
class fsspec.implementations.github.GithubFileSystem(*args, **kwargs)[source]

Interface to files in github

An instance of this class provides the files residing within a remote github repository. You may specify a point in the repos history, by SHA, branch or tag (default is current master).

Given that code files tend to be small, and that github does not support retrieving partial content, we always fetch whole files.

When using fsspec.open, allows URIs of the form:

  • “github://path/file”, in which case you must specify org, repo and may specify sha in the extra args

  • ‘github://org:repo@/precip/catalog.yml’, where the org and repo are part of the URI

  • ‘github://org:repo@sha/precip/catalog.yml’, where the sha is also included

sha can be the full or abbreviated hex of the commit you want to fetch from, or a branch or tag name (so long as it doesn’t contain special characters like “/”, “?”, which would have to be HTTP-encoded).

For authorised access, you must provide username and token, which can be made at https://github.com/settings/tokens

__init__(org, repo, sha=None, username=None, token=None, timeout=None, **kwargs)[source]

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.http.HTTPFileSystem(*args, **kwargs)[source]

Simple File-System for fetching data via HTTP(S)

ls() is implemented by loading the parent page and doing a regex match on the result. If simple_link=True, anything of the form “http(s)://server.com/stuff?thing=other”; otherwise only links within HTML href tags will be used.

__init__(simple_links=True, block_size=None, same_scheme=True, size_policy=None, cache_type='bytes', cache_options=None, asynchronous=False, loop=None, client_kwargs=None, get_client=<function get_client>, encoded=False, **storage_options)[source]

NB: if this is called async, you must await set_client

Parameters:
block_size: int

Blocks to read bytes; if 0, will default to raw requests file-like objects instead of HTTPFile instances

simple_links: bool

If True, will consider both HTML <a> tags and anything that looks like a URL; if False, will consider only the former.

same_scheme: True

When doing ls/glob, if this is True, only consider paths that have http/https matching the input URLs.

size_policy: this argument is deprecated
client_kwargs: dict

Passed to aiohttp.ClientSession, see https://docs.aiohttp.org/en/stable/client_reference.html For example, {'auth': aiohttp.BasicAuth('user', 'pass')}

get_client: Callable[…, aiohttp.ClientSession]

A callable which takes keyword arguments and constructs an aiohttp.ClientSession. It’s state will be managed by the HTTPFileSystem class.

storage_options: key-value

Any other parameters passed on to requests

cache_type, cache_options: defaults used in open
class fsspec.implementations.jupyter.JupyterFileSystem(*args, **kwargs)[source]

View of the files as seen by a Jupyter server (notebook or lab)

__init__(url, tok=None, **kwargs)[source]
Parameters:
urlstr

Base URL of the server, like “http://127.0.0.1:8888”. May include token in the string, which is given by the process when starting up

tokstr

If the token is obtained separately, can be given here

kwargs
class fsspec.implementations.libarchive.LibArchiveFileSystem(*args, **kwargs)[source]

Compressed archives as a file-system (read-only)

Supports the following formats: tar, pax , cpio, ISO9660, zip, mtree, shar, ar, raw, xar, lha/lzh, rar Microsoft CAB, 7-Zip, WARC

See the libarchive documentation for further restrictions. https://www.libarchive.org/

Keeps file object open while instance lives. It only works in seekable file-like objects. In case the filesystem does not support this kind of file object, it is recommended to cache locally.

This class is pickleable, but not necessarily thread-safe (depends on the platform). See libarchive documentation for details.

__init__(fo='', mode='r', target_protocol=None, target_options=None, block_size=5242880, **kwargs)[source]
Parameters:
fo: str or file-like

Contains ZIP, and must exist. If a str, will fetch file using open_files(), which must return one file exactly.

mode: str

Currently, only ‘r’ accepted

target_protocol: str (optional)

If fo is a string, this value can be used to override the FS protocol inferred from a URL

target_options: dict (optional)

Kwargs passed when instantiating the target FS, if fo is a string.

class fsspec.implementations.local.LocalFileSystem(*args, **kwargs)[source]

Interface to files on local storage

Parameters:
auto_mkdir: bool

Whether, when opening a file, the directory containing it should be created (if it doesn’t already exist). This is assumed by pyarrow code.

__init__(auto_mkdir=False, **kwargs)[source]

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.memory.MemoryFileSystem(*args, **kwargs)[source]

A filesystem based on a dict of BytesIO objects

This is a global filesystem so instances of this class all point to the same in memory filesystem.

__init__(*args, **storage_options)

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.reference.ReferenceFileSystem(*args, **kwargs)[source]

View byte ranges of some other file as a file system Initial version: single file system target, which must support async, and must allow start and end args in _cat_file. Later versions may allow multiple arbitrary URLs for the targets. This FileSystem is read-only. It is designed to be used with async targets (for now). This FileSystem only allows whole-file access, no open. We do not get original file details from the target FS. Configuration is by passing a dict of references at init, or a URL to a JSON file containing the same; this dict can also contain concrete data for some set of paths. Reference dict format: {path0: bytes_data, path1: (target_url, offset, size)} https://github.com/fsspec/kerchunk/blob/main/README.md

__init__(fo, target=None, ref_storage_args=None, target_protocol=None, target_options=None, remote_protocol=None, remote_options=None, fs=None, template_overrides=None, simple_templates=True, max_gap=64000, max_block=256000000, cache_size=128, **kwargs)[source]
Parameters:
fodict or str

The set of references to use for this instance, with a structure as above. If str referencing a JSON file, will use fsspec.open, in conjunction with target_options and target_protocol to open and parse JSON at this location. If a directory, then assume references are a set of parquet files to be loaded lazily.

targetstr

For any references having target_url as None, this is the default file target to use

ref_storage_argsdict

If references is a str, use these kwargs for loading the JSON file. Deprecated: use target_options instead.

target_protocolstr

Used for loading the reference file, if it is a path. If None, protocol will be derived from the given path

target_optionsdict

Extra FS options for loading the reference file fo, if given as a path

remote_protocolstr

The protocol of the filesystem on which the references will be evaluated (unless fs is provided). If not given, will be derived from the first URL that has a protocol in the templates or in the references, in that order.

remote_optionsdict

kwargs to go with remote_protocol

fsAbstractFileSystem | dict(str, (AbstractFileSystem | dict))
Directly provide a file system(s):

  • a single filesystem instance

  • a dict of protocol:filesystem, where each value is either a filesystem instance, or a dict of kwargs that can be used to create in instance for the given protocol

If this is given, remote_options and remote_protocol are ignored.

template_overridesdict

Swap out any templates in the references file with these - useful for testing.

simple_templates: bool

Whether templates can be processed with simple replace (True) or if jinja is needed (False, much slower). All reference sets produced by kerchunk are simple in this sense, but the spec allows for complex.

max_gap, max_block: int

For merging multiple concurrent requests to the same remote file. Neighboring byte ranges will only be merged when their inter-range gap is <= max_gap. Default is 64KB. Set to 0 to only merge when it requires no extra bytes. Pass a negative number to disable merging, appropriate for local target files. Neighboring byte ranges will only be merged when the size of the aggregated range is <= max_block. Default is 256MB.

cache_sizeint

Maximum size of LRU cache, where cache_size*record_size denotes the total number of references that can be loaded in memory at once. Only used for lazily loaded references.

kwargspassed to parent class
class fsspec.implementations.reference.LazyReferenceMapper(root, fs=None, out_root=None, cache_size=128, categorical_threshold=10)[source]

This interface can be used to read/write references from Parquet stores. It is not intended for other types of references. It can be used with Kerchunk’s MultiZarrToZarr method to combine references into a parquet store. Examples of this use-case can be found here: https://fsspec.github.io/kerchunk/advanced.html?highlight=parquet#parquet-storage

__init__(root, fs=None, out_root=None, cache_size=128, categorical_threshold=10)[source]

This instance will be writable, storing changes in memory until full partitions are accumulated or .flush() is called.

To create an empty lazy store, use .create()

Parameters:
rootstr

Root of parquet store

fsfsspec.AbstractFileSystem

fsspec filesystem object, default is local filesystem.

cache_sizeint, default=128

Maximum size of LRU cache, where cache_size*record_size denotes the total number of references that can be loaded in memory at once.

categorical_thresholdint

Encode urls as pandas.Categorical to reduce memory footprint if the ratio of the number of unique urls to total number of refs for each variable is greater than or equal to this number. (default 10)

class fsspec.implementations.sftp.SFTPFileSystem(*args, **kwargs)[source]

Files over SFTP/SSH

Peer-to-peer filesystem over SSH using paramiko.

Note: if using this with the open or open_files, with full URLs, there is no way to tell if a path is relative, so all paths are assumed to be absolute.

__init__(host, **ssh_kwargs)[source]
Parameters:
host: str

Hostname or IP as a string

temppath: str

Location on the server to put files, when within a transaction

ssh_kwargs: dict

Parameters passed on to connection. See details in https://docs.paramiko.org/en/3.3/api/client.html#paramiko.client.SSHClient.connect May include port, username, password…

class fsspec.implementations.smb.SMBFileSystem(*args, **kwargs)[source]

Allow reading and writing to Windows and Samba network shares.

When using fsspec.open() for getting a file-like object the URI should be specified as this format: smb://workgroup;user:password@server:port/share/folder/file.csv.

Example:

>>> import fsspec
>>> with fsspec.open(
...     'smb://myuser:mypassword@myserver.com/' 'share/folder/file.csv'
... ) as smbfile:
...     df = pd.read_csv(smbfile, sep='|', header=None)

Note that you need to pass in a valid hostname or IP address for the host component of the URL. Do not use the Windows/NetBIOS machine name for the host component.

The first component of the path in the URL points to the name of the shared folder. Subsequent path components will point to the directory/folder/file.

The URL components workgroup , user, password and port may be optional.

Note

For working this source require smbprotocol to be installed, e.g.:

$ pip install smbprotocol
# or
# pip install smbprotocol[kerberos]

Note: if using this with the open or open_files, with full URLs, there is no way to tell if a path is relative, so all paths are assumed to be absolute.

__init__(host, port=None, username=None, password=None, timeout=60, encrypt=None, share_access=None, register_session_retries=5, auto_mkdir=False, **kwargs)[source]

You can use _get_kwargs_from_urls to get some kwargs from a reasonable SMB url.

Authentication will be anonymous or integrated if username/password are not given.

Parameters:
host: str

The remote server name/ip to connect to

port: int or None

Port to connect with. Usually 445, sometimes 139.

username: str or None

Username to connect with. Required if Kerberos auth is not being used.

password: str or None

User’s password on the server, if using username

timeout: int

Connection timeout in seconds

encrypt: bool

Whether to force encryption or not, once this has been set to True the session cannot be changed back to False.

share_access: str or None

Specifies the default access applied to file open operations performed with this file system object. This affects whether other processes can concurrently open a handle to the same file.

  • None (the default): exclusively locks the file until closed.

  • ‘r’: Allow other handles to be opened with read access.

  • ‘w’: Allow other handles to be opened with write access.

  • ‘d’: Allow other handles to be opened with delete access.

auto_mkdir: bool

Whether, when opening a file, the directory containing it should be created (if it doesn’t already exist). This is assumed by pyarrow and zarr-python code.

class fsspec.implementations.tar.TarFileSystem(*args, **kwargs)[source]

Compressed Tar archives as a file-system (read-only)

Supports the following formats: tar.gz, tar.bz2, tar.xz

__init__(fo='', index_store=None, target_options=None, target_protocol=None, compression=None, **kwargs)[source]

Create and configure file-system instance

Instances may be cachable, so if similar enough arguments are seen a new instance is not required. The token attribute exists to allow implementations to cache instances if they wish.

A reasonable default should be provided if there are no arguments.

Subclasses should call this method.

Parameters:
use_listings_cache, listings_expiry_time, max_paths:

passed to DirCache, if the implementation supports directory listing caching. Pass use_listings_cache=False to disable such caching.

skip_instance_cache: bool

If this is a cachable implementation, pass True here to force creating a new instance even if a matching instance exists, and prevent storing this instance.

asynchronous: bool
loop: asyncio-compatible IOLoop or None
class fsspec.implementations.webhdfs.WebHDFS(*args, **kwargs)[source]

Interface to HDFS over HTTP using the WebHDFS API. Supports also HttpFS gateways.

Four auth mechanisms are supported:

insecure: no auth is done, and the user is assumed to be whoever they

say they are (parameter user), or a predefined value such as “dr.who” if not given

spnego: when kerberos authentication is enabled, auth is negotiated by

requests_kerberos https://github.com/requests/requests-kerberos . This establishes a session based on existing kinit login and/or specified principal/password; parameters are passed with kerb_kwargs

token: uses an existing Hadoop delegation token from another secured

service. Indeed, this client can also generate such tokens when not insecure. Note that tokens expire, but can be renewed (by a previously specified user) and may allow for proxying.

basic-auth: used when both parameter user and parameter password

are provided.

__init__(host, port=50070, kerberos=False, token=None, user=None, password=None, proxy_to=None, kerb_kwargs=None, data_proxy=None, use_https=False, session_cert=None, session_verify=True, **kwargs)[source]
Parameters:
host: str

Name-node address

port: int

Port for webHDFS

kerberos: bool

Whether to authenticate with kerberos for this connection

token: str or None

If given, use this token on every call to authenticate. A user and user-proxy may be encoded in the token and should not be also given

user: str or None

If given, assert the user name to connect with

password: str or None

If given, assert the password to use for basic auth. If password is provided, user must be provided also

proxy_to: str or None

If given, the user has the authority to proxy, and this value is the user in who’s name actions are taken

kerb_kwargs: dict

Any extra arguments for HTTPKerberosAuth, see https://github.com/requests/requests-kerberos/blob/master/requests_kerberos/kerberos_.py

data_proxy: dict, callable or None

If given, map data-node addresses. This can be necessary if the HDFS cluster is behind a proxy, running on Docker or otherwise has a mismatch between the host-names given by the name-node and the address by which to refer to them from the client. If a dict, maps host names host->data_proxy[host]; if a callable, full URLs are passed, and function must conform to url->data_proxy(url).

use_https: bool

Whether to connect to the Name-node using HTTPS instead of HTTP

session_cert: str or Tuple[str, str] or None

Path to a certificate file, or tuple of (cert, key) files to use for the requests.Session

session_verify: str, bool or None

Path to a certificate file to use for verifying the requests.Session.

kwargs
class fsspec.implementations.zip.ZipFileSystem(*args, **kwargs)[source]

Read/Write contents of ZIP archive as a file-system

Keeps file object open while instance lives.

This class is pickleable, but not necessarily thread-safe

__init__(fo='', mode='r', target_protocol=None, target_options=None, compression=0, allowZip64=True, compresslevel=None, **kwargs)[source]
Parameters:
fo: str or file-like

Contains ZIP, and must exist. If a str, will fetch file using open_files(), which must return one file exactly.

mode: str

Accept: “r”, “w”, “a”

target_protocol: str (optional)

If fo is a string, this value can be used to override the FS protocol inferred from a URL

target_options: dict (optional)

Kwargs passed when instantiating the target FS, if fo is a string.

compression, allowZip64, compresslevel: passed to ZipFile

Only relevant when creating a ZIP

Other Known Implementations

  • abfs for Azure Blob service

  • adl for Azure DataLake storage

  • alluxiofs to access fsspec implemented filesystem with Alluxio distributed cache

  • boxfs for access to Box file storage

  • dropbox for access to dropbox shares

  • dvc to access DVC/Git repository as a filesystem

  • gcsfs for Google Cloud Storage

  • gdrive to access Google Drive and shares (experimental)

  • huggingface_hub to access the Hugging Face Hub filesystem, with protocol “hf://”

  • lakefs for lakeFS data lakes

  • ocifs for access to Oracle Cloud Object Storage

  • ocilake for OCI Data Lake storage

  • ossfs for Alibaba Cloud (Aliyun) Object Storage System (OSS)

  • p9fs for 9P (Plan 9 Filesystem Protocol) servers

  • s3fs for Amazon S3 and other compatible stores

  • wandbfs to access Wandb run data (experimental)

  • webdav4 for WebDAV

Read Buffering

fsspec.caching.BlockCache(blocksize, ...[, ...])

Cache holding memory as a set of blocks.

fsspec.caching.BytesCache(blocksize, ...[, trim])

Cache which holds data in a in-memory bytes object

fsspec.caching.MMapCache(blocksize, fetcher, ...)

memory-mapped sparse file cache

fsspec.caching.ReadAheadCache(blocksize, ...)

Cache which reads only when we get beyond a block of data

fsspec.caching.FirstChunkCache(blocksize, ...)

Caches the first block of a file only

fsspec.caching.BackgroundBlockCache(...[, ...])

Cache holding memory as a set of blocks with pre-loading of the next block in the background.
class fsspec.caching.BlockCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int, maxblocks: int = 32)[source]

Cache holding memory as a set of blocks.

Requests are only ever made blocksize at a time, and are stored in an LRU cache. The least recently accessed block is discarded when more than maxblocks are stored.

Parameters:
blocksizeint

The number of bytes to store in each block. Requests are only ever made for blocksize, so this should balance the overhead of making a request against the granularity of the blocks.

fetcherCallable
sizeint

The total size of the file being cached.

maxblocksint

The maximum number of blocks to cache for. The maximum memory use for this cache is then blocksize * maxblocks.

cache_info()[source]

The statistics on the block cache.

Returns:
NamedTuple

Returned directly from the LRU Cache used internally.

class fsspec.caching.BytesCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int, trim: bool = True)[source]

Cache which holds data in a in-memory bytes object

Implements read-ahead by the block size, for semi-random reads progressing through the file.

Parameters:
trim: bool

As we read more data, whether to discard the start of the buffer when we are more than a blocksize ahead of it.

class fsspec.caching.MMapCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int, location: str | None = None, blocks: set[int] | None = None)[source]

memory-mapped sparse file cache

Opens temporary file, which is filled blocks-wise when data is requested. Ensure there is enough disc space in the temporary location.

This cache method might only work on posix

class fsspec.caching.ReadAheadCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int)[source]

Cache which reads only when we get beyond a block of data

This is a much simpler version of BytesCache, and does not attempt to fill holes in the cache or keep fragments alive. It is best suited to many small reads in a sequential order (e.g., reading lines from a file).

class fsspec.caching.FirstChunkCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int)[source]

Caches the first block of a file only

This may be useful for file types where the metadata is stored in the header, but is randomly accessed.

class fsspec.caching.BackgroundBlockCache(blocksize: int, fetcher: Callable[[int, int], bytes], size: int, maxblocks: int = 32)[source]

Cache holding memory as a set of blocks with pre-loading of the next block in the background.

Requests are only ever made blocksize at a time, and are stored in an LRU cache. The least recently accessed block is discarded when more than maxblocks are stored. If the next block is not in cache, it is loaded in a separate thread in non-blocking way.

Parameters:
blocksizeint

The number of bytes to store in each block. Requests are only ever made for blocksize, so this should balance the overhead of making a request against the granularity of the blocks.

fetcherCallable
sizeint

The total size of the file being cached.

maxblocksint

The maximum number of blocks to cache for. The maximum memory use for this cache is then blocksize * maxblocks.

cache_info() → CacheInfo[source]

The statistics on the block cache.

Returns:
NamedTuple

Returned directly from the LRU Cache used internally.

Utilities

fsspec.utils.read_block(f, offset, length[, ...])

Read a block of bytes from a file
fsspec.utils.read_block(f: IO[bytes], offset: int, length: int | None, delimiter: bytes | None = None, split_before: bool = False) → bytes[source]

Read a block of bytes from a file

Parameters:
f: File

Open file

offset: int

Byte offset to start read

length: int

Number of bytes to read, read through end of file if None

delimiter: bytes (optional)

Ensure reading starts and stops at delimiter bytestring

split_before: bool (optional)

Start/stop read before delimiter bytestring.

If using the ``delimiter=`` keyword argument we ensure that the read
starts and stops at delimiter boundaries that follow the locations
``offset`` and ``offset + length``. If ``offset`` is zero then we
start at zero, regardless of delimiter. The bytestring returned WILL
include the terminating delimiter string.

Examples

>>> from io import BytesIO  
>>> f = BytesIO(b'Alice, 100\nBob, 200\nCharlie, 300')  
>>> read_block(f, 0, 13)  
b'Alice, 100\nBo'

>>> read_block(f, 0, 13, delimiter=b'\n')  
b'Alice, 100\nBob, 200\n'

>>> read_block(f, 10, 10, delimiter=b'\n')  
b'Bob, 200\nCharlie, 300'