This directory stores symlinks to standard library modules and packages that are fully type-annotated and ready to be used in type checking of the rest of the stdlib or Tools/ and so on.

Due to most of the standard library being untyped, we prefer not to point mypy directly at Lib/ for type checking. Additionally, mypy as a tool does not support shadowing typing-related standard libraries like types, typing, and collections.abc.

So instead, we set mypy_path to include this directory, which only links modules and packages we know are safe to be type-checked themselves and used as dependencies. See Lib/_pyrepl/mypy.ini for a usage example.

Add it to typed-stdlib.txt and run make_symlinks.py --symlink.

The symlinks in this directory are skipped in source tarballs in Python releases. This ensures they don't end up in the SBOM. To recreate them, run the make_symlinks.py --symlink script.