with import <nixpkgs> {};
(let
  myPythonPackage = python35Packages.buildPythonPackage rec {
      pname = "myPackageName";
      name = pname + "-" + version;
      version = "0.1";
      src = builtins.fetchGit {
        url = /home/user/packages/someGitRepositoryAsADirectory;
        rev = "a892e558f11b8b81713da49b1092fc479d692372";
      };
      doCheck = false;
      propagatedBuildInputs = with pkgs.python35Packages; [
        # Python dependencies for myPythonPackage go here
      ];
};
in pkgs.python35.buildEnv.override rec {
  extraLibs = with pkgs.python35Packages;

  ######## Add extra packages you want in the environment here #########
  # It can be python packages or non-python packages
  # If not a python package, then use pkgs prefix `pkgs.packageName` like `pkgs.openssl`
  # Otherwise just use the name of the python package like `pandas` or `numpy`
  # By default, it includes extra `ipykernel`, which is ipython kernel.

  [ myPythonPackage ipykernel ];

}
).env