Why is the dependency for my Python package unavailable?

Development
1

I’m writing my first Nix-expression in nixpkgs to install my own Python package:

{ buildPythonPackage, fetchPypi, stdenv }:

buildPythonPackage rec {
  pname = "vcard";
  version = "0.12.2";

  src = fetchPypi {
    inherit pname version;
    sha256 = "063b64ec0a4cff4e0f6a995cad04308524d3367a9521c2bff00daf2a430635b7";
  };

  meta = with stdenv.lib; {
    homepage = https://gitlab.com/victor-engmark/vcard;
    description = "vCard validator, class and utility functions";
    license = licenses.agpl3Plus;
    maintainers = [ maintainers.l0b0 ];
  };
}

However, nix-build --attr vcard complains:

Collecting python-dateutil (from vcard==0.12.2)
  ERROR: Could not find a version that satisfies the requirement python-dateutil (from vcard==0.12.2) (from versions: none)
ERROR: No matching distribution found for python-dateutil (from vcard==0.12.2)
builder for '/nix/store/m77wf6mpqch1m2fv4f18chihxp21g576-python3.7-vcard-0.12.2.drv' failed with exit code 1

The package builds fine both locally and in CI.

2

What happens when you are running nix search dateutil?

3

You need to add buildInputs to your expression. Check out other python packages for reference.

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