sample.nix

# generated using pypi2nix tool (version: 1.8.1)
# See more at: https://github.com/garbas/pypi2nix

{ pkgs ? import <nixpkgs> {}
}:

let

  inherit (pkgs) makeWrapper stdenv glibcLocales;
  inherit (pkgs.stdenv.lib) fix' extends inNixShell;

  pythonPackages =
  import "${toString pkgs.path}/pkgs/top-level/python-packages.nix" {
    inherit pkgs;
    inherit (pkgs) stdenv;
    python = pkgs.python27Full;
    # patching pip so it does not try to remove files when running nix-shell
    overrides =
      self: super: {
        bootstrapped-pip = super.bootstrapped-pip.overrideDerivation (old: {
          patchPhase = old.patchPhase + ''
            if [ -e $out/${pkgs.python27Full.sitePackages}/pip/req/req_install.py ]; then
              sed -i \
                -e "s|paths_to_remove.remove(auto_confirm)|#paths_to_remove.remove(auto_confirm)|"  \
                -e "s|self.uninstalled = paths_to_remove|#self.uninstalled = paths_to_remove|"  \
                $out/${pkgs.python27Full.sitePackages}/pip/req/req_install.py
            fi
          '';
        });
      };
  };

  commonBuildInputs = with pkgs; [ mysql55 gfortran blas pkgconfig freetype.dev libpng agg libressl ];
  commonDoCheck = false;

  withPackages = pkgs':
    let
      pkgs = builtins.removeAttrs pkgs' ["__unfix__"];
      interpreterWithPackages = selectPkgsFn: pythonPackages.buildPythonPackage {
        name = "python27Full-interpreter";
        buildInputs = [ makeWrapper ] ++ (selectPkgsFn pkgs);
        buildCommand = ''
          mkdir -p $out/bin
          ln -s ${pythonPackages.python.interpreter} \
              $out/bin/${pythonPackages.python.executable}
          for dep in ${builtins.concatStringsSep " "
              (selectPkgsFn pkgs)}; do
            if [ -d "$dep/bin" ]; then
              for prog in "$dep/bin/"*; do
                if [ -x "$prog" ] && [ -f "$prog" ]; then
                  ln -s $prog $out/bin/`basename $prog`
                fi
              done
            fi
          done
          for prog in "$out/bin/"*; do
            wrapProgram "$prog" --prefix PYTHONPATH : "$PYTHONPATH" --set LC_CTYPE en_US.UTF-8 --set LC_ALL en_US.UTF-8 --set LANG en_US.UTF-8 --unset LD_LIBRARY_PATH
          done
          pushd $out/bin
          ln -s ${pythonPackages.python.executable} python
          ln -s ${pythonPackages.python.executable} \
              python2
          popd
        '';
        passthru.interpreter = pythonPackages.python;
      };

      interpreter = interpreterWithPackages builtins.attrValues;
    in {
      __old = pythonPackages;
      inherit interpreter;
      inherit interpreterWithPackages;
      mkDerivation = pythonPackages.buildPythonPackage;
      packages = pkgs;
      overrideDerivation = drv: f:
        pythonPackages.buildPythonPackage (
          drv.drvAttrs // f drv.drvAttrs // { meta = drv.meta; }
        );
      withPackages = pkgs'':
        withPackages (pkgs // pkgs'');
    };

  python = withPackages {};

  generated = self: {
    "LinkChecker" = python.mkDerivation {
      name = "LinkChecker-9.2";
      src = pkgs.fetchurl { url = "https://files.pythonhosted.org/packages/a9/b3/33de0997bd24c6551a5f13182dbc2b59774cf98c78dcffad37a6f8d57a65/LinkChecker-9.2.tar.gz"; sha256 = "ba556cd1c172c2cbcb92fc3405d48f44fa56c3074ed3b7ead87f635ad54fb907"; };
      doCheck = commonDoCheck;
      checkPhase = "";
      installCheckPhase = "";
      buildInputs = commonBuildInputs;
      propagatedBuildInputs = [
      self."requests"
    ];
      meta = with pkgs.stdenv.lib; {
        homepage = "http://wummel.github.io/linkchecker/";
        license = licenses.gpl1;
        description = "check links in web documents or full websites";
      };
    };

    "opencv3" = pythonPackages.opencv3.overrideAttrs(oldAttrs: {
      version = "3.4.3";
    });
  };
  localOverridesFile = ./requirements_override.nix;
  overrides = import localOverridesFile { inherit pkgs python; };
  commonOverrides = [
    
  ];
  allOverrides =
    (if (builtins.pathExists localOverridesFile)
     then [overrides] else [] ) ++ commonOverrides;

in python.withPackages
   (fix' (pkgs.lib.fold
            extends
            generated
            allOverrides
         )
   )