nixpkgs/pkgs/development/interpreters/python/catch_conflicts/README.md

catch_conflicts.py

The file catch_conflicts.py is in a subdirectory because, if it isn't, the /nix/store/ directory is added to sys.path causing a delay when building.

Pointers:

• https://docs.python.org/3/library/sys.html#sys.path

• https://github.com/NixOS/nixpkgs/pull/23600