The python-skeletons repository is deprecated. There is now a standard for type hints in Python:

• PEP 484: Type Hints for syntax and semantics of type hints
• The Typeshed repository for the common collection of Python stubs

PyCharm 2017.1 and newer bundles the whole Typeshed repo, but only a few modules from it are actually enabled in PyCharm (including builtins, typing, six, and several others).

If you want to add any other module from Typeshed to your project, you can put it inside your project's root or into the source folders of your project.

Feel free to contribute your changes to the Typeshed repo. Make sure you've read the contributing notes. More modules from Typeshed will be enabled in the next versions of PyCharm.

• Old docs about python-skeletons (Deprecated!)