Setup a development environment for Python in NixOS: failed tries

a.md

These are failed experiments to setup a development environment for Python in NixOS.

The working solution can be found: https://github.com/monadplus/python-template-nix

shell0.nix

with import <nixpkgs> {}; # Please, fix always the package

(let
  python = let
    packageOverrides = self: super: {
      pandas = super.pandas.overridePythonAttrs(old: rec {
        doCheck = false;
      });
    };
  in pkgs.python37.override {inherit packageOverrides; self = python;};

in python.withPackages(ps: [ ps.pandas ])).env

shell1.nix

let unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
    pkgs = import unstableTarball {};

    pythonPackages = pkgs.python35Packages;
in
  pkgs.mkShell rec {
    name = "impurePythonEnv";
    venvDir = "./.venv";
    buildInputs = [

      pythonPackages.python

      pythonPackages.venvShellHook

      #pythonPackages.numpy
      #pythonPackages.requests

      pkgs.openssl
      pkgs.git
      pkgs.gcc

    ];

    postShellHook = ''
      pip install -r requirements.txt
    '';

  }