Docs Python: fix example on how to override the package set

Not passing in the newly created interpreter as `self` results in an
incorrect `passthru`. Solves #64334.

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/languages-frameworks/python.section.md b/doc/languages-frameworks/python.section.md
index 1dc111114bd..77b387dd302 100644
--- a/doc/languages-frameworks/python.section.md
+++ b/doc/languages-frameworks/python.section.md
@@ -636,7 +636,7 @@ with import <nixpkgs> {};
         };
       });
     };
-  in pkgs.python3.override {inherit packageOverrides;};
+  in pkgs.python3.override {inherit packageOverrides; self = python;};
 
 in python.withPackages(ps: [ps.blaze])).env
 ```