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File-system specification

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A specification for pythonic filesystems.


pip install fsspec


conda install -c conda-forge fsspec


To produce a template or specification for a file-system interface, that specific implementations should follow, so that applications making use of them can rely on a common behaviour and not have to worry about the specific internal implementation decisions with any given backend. Many such implementations are included in this package, or in sister projects such as s3fs and gcsfs.

In addition, if this is well-designed, then additional functionality, such as a key-value store or FUSE mounting of the file-system implementation may be available for all implementations "for free".


Please refer to RTD


fsspec uses tox and tox-conda to manage dev and test environments. First, install conda with tox and tox-conda in a base environment (eg. conda install -c conda-forge tox tox-conda). Calls to tox can then be used to configure a development environment and run tests.

First, setup a development conda environment via tox -e dev. This will install fspec dependencies, test & dev tools, and install fsspec in develop mode. Then, activate the dev environment under .tox/dev via conda activate .tox/dev.


Tests can be run directly in the activated dev environment via pytest fsspec.

The full fsspec test suite can be run via tox, which will setup and execute tests against multiple dependency versions in isolated environment. Run tox -av to list available test environments, select environments via tox -e <env>.

The full fsspec suite requires a system-level docker, docker-compose, and fuse installation. See ci/ for a detailed installation example.

Code Formatting

fsspec uses Black to ensure a consistent code format throughout the project. black is automatically installed in the tox dev env, activated via conda activate .tox/dev.

Then, run black fsspec from the root of the filesystem_spec repository to auto-format your code. Additionally, many editors have plugins that will apply black as you edit files.

Optionally, you may wish to setup pre-commit hooks to automatically run black when you make a git commit. black is automatically installed in the tox dev env, activated via conda activate .tox/dev.

Then, run pre-commit install --install-hooks from the root of the filesystem_spec repository to setup pre-commit hooks. black will now be run before you commit, reformatting any changed files. You can format without committing via pre-commit run or skip these checks with git commit --no-verify.

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