The addresses of multiprocessing.connection can also be bytes

[lw]

Typeshed says that the addresses used in multiprocessing.connection are str | tuple[str, int]. However, sometimes a bytes can be returned as well:

$ python3
Python 3.9.15 (main, Nov 24 2022, 14:31:59)
[GCC 11.2.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing.connection import Listener
>>> l = Listener("", "AF_UNIX")
>>> l.address
b'\x00listener-1553475-0'

I believe this is "new" starting in Python 3.9.

[srittau]

I think our best bet - unfortunately - is annotating address using Any. (Cf. python/typing#566)