diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index faab3eb785e4..ef358c7b63fc 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -36,7 +36,7 @@
             stdenv
           ];
           providesSetupHook = lib.attrByPath [ "provides" "setupHook"] false;
-          valid = value: !((lib.isDerivation value) && !((pythonPackages.hasPythonModule value) || (providesSetupHook value))) || (lib.elem value exceptions);
+          valid = value: !lib.isDerivation value || pythonPackages.hasPythonModule value || providesSetupHook value || lib.elem value exceptions;
           func = name: value: if (valid value) then value else throw "${name} should use `buildPythonPackage` or `toPythonModule` if it is to be part of the Python packages set.";
         in lib.mapAttrs func items;
       in ensurePythonModules (callPackage