dlwh / filesystem_spec

A specification that python filesystems should adhere to.

filesystem_spec

A specification for pythonic filesystems.

Install

pip install fsspec

or

conda install -c conda-forge fsspec

Purpose

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".

Documentation

Please refer to RTD

Develop

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 {env} where env is one of {py36,py37,py38,py39}. This will install fsspec dependencies, test & dev tools, and install fsspec in develop mode. You may activate the dev environment under .tox/{env} via conda activate .tox/{env}.

Testing

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

Alternatively, the full fsspec test suite can also be run via tox, which will also build the appropriate environment (see above), with the environment specified by the TOXENV environment variable.

The full fsspec suite requires a system-level docker, docker-compose, and fuse installation.

Code Formatting

fsspec uses Black to ensure a consistent code format throughout the project. 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. black is included in the tox environments.

Optionally, you may wish to setup pre-commit hooks to automatically run black when you make a git commit. 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.