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Generate nix expressions for Python packages.

The original author of pip2nix started the project with the following motivation:

I needed something that can work not only with pypi but also with local paths, VCS links, and dependency links. I couldn't get any of the other generators to work, so I started my own :-)

Major difference between pip2nix and pypi2nix is that pip2nix can be used to extend nixpkgs Python package set and reuse its package functions where pypi2nix maintains separate package tree from nixpkgs. Bot approaches have their own pros and cons.

Be aware that pip2nix is not yet mature software. It is a tool to aid Python developers who use Nix to automate a good chunk of the work to maintain a Nix based development environments.

The recommended usage at the moment is inside of a nix-shell, since this avoids putting a specific version into the user's environment:

$ git clone https://github.com/nix-community/pip2nix
$ cd pip2nix
$ nix-shell release.nix -A pip2nix.python36

Alternatively pip2nix can be installed into the user's environment:

$ git clone https://github.com/nix-community/pip2nix
$ nix-env -f pip2nix/release.nix -iA pip2nix.python36

To generate python-packages.nix for a set of requirements:

$ pip2nix generate -r requirements.txt

pip2nix generate takes the same set of package specifications pip install does.

Problems and questions should go to GitHub issues.

Tomasz Kontusz started the project back in 2015, he's ktosiek on Freenode, and @tkontusz on Twitter.

In 2016 Johannes Bornhold took over as maintainer, since he was actively using pip2nix and Tomas was not actively using it himself anymore. Find him via https://www.johbo.com.

In 2019 Asko Soukka forked the project below https://github.com/nix-community/ and took over as maintainer.