Pypi2nix installed but won't run

Help
1

I’ve installed nix on Mac OS Catalina after encountering several problems. I was not able to find the installation
nix --version gave me
nix: command not found'
until I read a suggestion to run
. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
now i have
nix (Nix) 2.6.0

I attempted to install pypi2nix
nix-env -iA nixpkgs.pypi2nix but got the error
Package ‘pypi2nix-2.0.4’ in /nix/store/0p5yvrdi3ss7s6p0ndgwi7dy8bjg4d3f-nixpkgs/nixpkgs/pkgs/development/tools/pypi2nix/default.nix:7 is marked as broken

So I temporarily allowed broken packages
export NIXPKGS_ALLOW_BROKEN=1
The installation of pipi2nix appeared to complete but, if I try run run pypi2nix I get

ImportError: cannot import name 'nix_prefetch_github' from 'nix_prefetch_github' (/nix/store/7f4r80iciwfs2z5dwiwrhmgn4cw1n24p-python3.9-nix-prefetch-github-5.0.1/lib/python3.9/site-packages/nix_prefetch_github/__init__.py)

All I need to do is run pypi2nix on an updated requirements.txt and generate an updated dependencies.nix

Any suggestions would be appreciated

2

When it’s marked as broken that generally means what it says, the package is broken. You can see it marked broken here and also there’s a link to why. The repo also notes that pypi2nix is abandoned. If you’re able to use Poetry for your Python project there’s poetry2nix. There are a variety of ways to use Python in the manual as well.

That said if you desperately need pypi2nix you can try installing an old version maybe.

3

OK. Thanks for clearing that up. And thanks for the suggestions.

4

Also see the nixos wiki page for python describing several ways of managing python environments, one of which is mach-nix (maintained by myself) which is targeted towards requirements.txt based environments and should be suitable as a pypi2nix replacement.

5

Hi
Thanks for your help. I will surely look in to that.

6

mach-nix is dead, long live dream2nix