pythonNew.diff

diff --git a/pkgs/development/interpreters/python/interpreter.nix b/pkgs/development/interpreters/python/interpreter.nix
index 3683543..cf5a3fa 100644
--- a/pkgs/development/interpreters/python/interpreter.nix
+++ b/pkgs/development/interpreters/python/interpreter.nix
@@ -10,13 +10,15 @@ let
 
   inherit (stdenv) lib;
 
+  override = overrides: (import ./interpreter.nix { inherit pkgs stdenv python overrides; }).pkgs;
+
   # Package set
   packages = let
 
     inherit (lib) fix' extends fold;
 
     pythonPackages = self: import ./support.nix {
-      inherit pkgs python buildPythonPackage mkDerivation wrapPython setuptools;
+      inherit pkgs python buildPythonPackage mkDerivation wrapPython setuptools override;
     } self;
 
     commonConfiguration = import ../../../top-level/python-packages.nix { inherit pkgs stdenv; };
diff --git a/pkgs/development/interpreters/python/support.nix b/pkgs/development/interpreters/python/support.nix
index 896dee5..43ed51a 100644
--- a/pkgs/development/interpreters/python/support.nix
+++ b/pkgs/development/interpreters/python/support.nix
@@ -1,5 +1,6 @@
 { pkgs
 , python
+, override
 , buildPythonPackage
 , mkDerivation
 , wrapPython
@@ -20,7 +21,7 @@ let
 
 in rec {
 
-  inherit python mkDerivation buildPythonPackage wrapPython setuptools;
+  inherit python mkDerivation buildPythonPackage wrapPython setuptools override;
   inherit modules;
 
   pythonAtLeast = versionAtLeast python.pythonVersion;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 11e9d2f..9a27bb6 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7151,14 +7151,16 @@ self: super: with super; {
   };
 
   lti = let
-    self' = (self.override {self = self';}) // {pytest = self.pytest_27;};
-    mock_1_0_1 = self'.mock.overrideDerivation (_: rec {
-      name = "mock-1.0.1";
-      propagatedBuildInputs = null;
-      src = pkgs.fetchurl {
-        url = "http://pypi.python.org/packages/source/m/mock/${name}.tar.gz";
-        sha256 = "0kzlsbki6q0awf89rc287f3aj8x431lrajf160a70z0ikhnxsfdq";
-      };
+    self' = self.override (super: self: {
+      pytest = self.pytest_27;
+      mock_1_0_1 = self'.mock.overrideDerivation (_: rec {
+        name = "mock-1.0.1";
+        src = pkgs.fetchurl {
+          url = "http://pypi.python.org/packages/source/m/mock/${name}.tar.gz";
+          sha256 = "0kzlsbki6q0awf89rc287f3aj8x431lrajf160a70z0ikhnxsfdq";
+        };
+        propagatedBuildInputs = null;
+      });
     });
   in buildPythonPackage rec {
     version = "0.4.1";