Type annotations (for mypy etc.)

[gjcarneiro]

One cool featured that would be nice to have would be if capnpy would automatically generate Python type annotations.

Relevant links:

• http://mypy-lang.org/
• https://www.python.org/dev/peps/pep-0484/
• https://www.python.org/dev/peps/pep-0561/

[nickmyatt]

This would be useful, but I cannot see any further announcements: https://github.com/cython/cython/issues/1826#issuecomment-323846354

[akhilman]

I just tried to manually write the type annotation to the .pyi file. It works well with pylsp even with a compiled pyx extension. The docstring defined in .pyi also showed up as class documentation.