Zarr Python

Overview

Zarr is a Python library for storing large N-dimensional arrays with chunking and compression. Apply this skill for efficient parallel I/O, cloud-native workflows, and seamless integration with NumPy, Dask, and Xarray.

Current upstream: zarr 3.2.1 (released 2026-05-05). Docs: zarr.readthedocs.io. New arrays default to Zarr format 3; set zarr_format=2 for legacy interop. Zarr 3.2 adds rectilinear chunks and continues to refine the v3 codec pipeline. This skill is a community guide maintained by K-Dense Inc., not an official zarr-developers package.

Quick Start

Installation

uv pip install "zarr==3.2.1"

Requires Python 3.12+ and NumPy 2.0+ for current stable Zarr-Python. For remote stores (S3, GCS, HTTP), pin the optional extras/backends in your project lockfile: