Merge pull request #317 from PrivateStorageio/nix-devshell-pythonpath

Some Nix-based development environment amenities

requirements/elpy.in

+# support elpy
+pip
+setuptools
+jedi

shell.nix

@@ -18,6 +18,7 @@ let
     requirements =
       ''
       ${builtins.readFile ./requirements/test.in}
+      ${builtins.readFile ./requirements/elpy.in}
       ${zkapauthorizer.requirements}
       '';
   };
@@ -27,6 +28,10 @@ pkgs.mkShell {
   # runs.
   PYTHONDONTWRITEBYTECODE = "1";
 
+  # Put this source tree into the Python import path, too, for a `setup.py
+  # develop`-like experience.
+  PYTHONPATH = "${builtins.toString ./.}/src";
+
   buildInputs = [
     # Supply all of the runtime and testing dependencies.
     python-env