fsspec — Filesystem Interfaces for Python

Filesystem Spec (fsspec) provides a unified, Pythonic interface to local, remote, and embedded file systems and bytes storage — including S3, GCS, Azure, HTTP, SFTP, memory, and more. It is the file-system abstraction layer used internally by Dask, pandas, PyArrow, Zarr, and many others. The current version is 2026.3.0, following a monthly calendar-versioning (CalVer) release cadence tied to the YYYY.MM.PATCH scheme.