pythonPackages.django_extensions : init at 1.8.1

[wizzup]

Motivation for this change

To add django-extensions to python-modules

Things done

• Tested using sandboxing : nix.useSandbox on NixOS
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested installation : nix-shell -I nixpkgs=/nix/nixpkgs -p python27Packages.django_extensions python36Packages.django_extensions
• Tested execution : tested manage.py with shell_plus and graph_models
• Fits CONTRIBUTING.md.

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[FRidh]

please add a comment explaining why you disable tests.

[wizzup]

The test was failed at the time I create this PR, due to many dependencies are missing.

I fix this in next commit. Now pass all the tests.

[FRidh]

Will you maintain this package?

[wizzup]

No, I won't. I don't think I have enough knowledge on python packaging.

I use django for my own personal project and found this project useful. Try to install it and think it would save time for other if the package is ready-to-use.

[Mic92]

The python packaging part can be handled by core maintainers. Often is more important to have someone, who knows how the library is supposed to work and have ways to use/test newer versions of it.

[lsix]

According to https://github.com/django-extensions/django-extensions/blob/b66dad0b4a3525a0f95977d198df87230907a154/setup.py#L130W six should probably be places in the propagatedBuildInputs.

[wizzup]

Thank a lot. I don't really understand build system (buildInputs, propagatedBuildInputs, nativeBuildInputs, etc). I try reading manual but doesn't fully get them.

Never have any problem with current expression, so I assume I wrote it correctly.

[Mic92]

For python they have the following semantics:

• propagatedBuildInputs: all python packages, which should be available for consumers of this package or in other words runtime dependencies
• buildInputs: dependencies only needed to build the package, for python this is most often test dependencies like mock and pytest.
• nativeBuildInputs: if this package would be cross-compiled, host-native packages like compilers would be included here, however it is not that common for python packages to require them.

[dotlambda]

@wizzup Do you still use the package? It's currently broken and I'd prefer to remove it if noone needs it.
EDIT: I've pushed an update to #43201.

[wizzup]

I didn't use django anymore currently, feel free to remove it if it no longer working.