Installation¶

Required dependencies¶

Required dependencies include:

Python (3.12 or later)
packaging (22.0 or later)
numpy (2.0 or later)
numcodecs (0.14 or later)
google-crc32c (1.5 or later)
typing_extensions (4.14 or later)
donfig (0.8 or later)

pip¶

Zarr is available on PyPI. Install it using pip:

pip install zarr

There are a number of optional dependency groups you can install for extra functionality. These can be installed using pip install "zarr[<extra>]", e.g. pip install "zarr[gpu]"

remote: support for reading/writing to remote data stores (fsspec, obstore)
gpu: support for GPUs (cupy)
cli: support for the zarr command-line interface (typer)
optional: support for path-like access to local and remote stores (universal-pathlib)
cast-value-rs: support for the cast_value codec (cast-value-rs)

conda¶

Zarr is also published to conda-forge. Install it using conda:

conda install -c conda-forge zarr

Conda does not support optional dependencies, so you will have to manually install any packages needed to enable extra functionality.

Nightly wheels¶

Development wheels are built nightly and published to the scientific-python-nightly-wheels index. To install the latest nightly build:

pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple zarr

Note that nightly wheels may be unstable and are intended for testing purposes.

Dependency support¶

Zarr has endorsed Scientific-Python SPEC 0 and now follows the version support window as outlined below:

Python: 36 months after initial release
Core package dependencies (e.g. NumPy): 24 months after initial release

Development¶

To install the latest development version of Zarr, see the contributing guide.