# fsspec/filesystem_spec

A specification that python filesystems should adhere to.

Repository: https://github.com/fsspec/filesystem_spec
Canonical: https://ross.abutalabs.com/products/filesystem_spec
Language: Python
License: BSD-3-Clause
License Family: permissive
Last push: 2026-08-25T14:31:37+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 3054, "days_push": 8, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1345, forks 469 (observed 2026-08-28T04:04:27.317403+00:00)

## What it is
fsspec is a Python specification and library defining a common interface for filesystem-like backends, with built-in implementations for local, memory, zip, and other file systems. It lets applications work uniformly across storage backends like S3, GCS, and SSH via sister packages such as s3fs and gcsfs.

## Use cases
- read and write files on s3 and gcs with the same python code
- abstract local and remote storage behind one api
- open remote files lazily in pandas or dask
- implement a custom python filesystem backend
- cache remote files locally for faster access
- mount or access key-value stores as a filesystem

## When to choose
- you need a unified file interface across local and cloud storage
- you build libraries that should work with any storage backend
- you want lazy, chunked access to remote files in data pipelines

## When to avoid
- you only need simple local file I/O with no abstraction
- you need POSIX-level guarantees like locking or permissions across backends
- you need a full FUSE mount with production-grade performance

## Facets
- artifact type: library
- maturity: active
- function: file-system, sdk, developer-tools
- domain: files, developer-tools
- platform: python, cross-platform
- tags: filesystem-abstraction, remote-storage, pyfilesystem, data-pipelines, data-engineering

## Member repositories
- fsspec/filesystem_spec (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:27.317403+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:42:45.380748+00:00, confidence not recorded.
  - readme: https://github.com/fsspec/filesystem_spec (fetched 2026-08-28T04:04:27.317403+00:00, sha 5547fad06dfe)
- Data as of 2026-08-30T08:39:29.467469+00:00.