Hi Juraj,
In the past, I have noticed this problem appear only on Python versions
prior to 3.10. Before PEP 604[1] – introduced in Python 3.10 – the pipe
operator was always used as an operator between objects instead of an
alias for Union in the annotations. A quick test verifies this:
Python 3.8.18 (default, Aug 25 2023, 13:20:30)
[GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from collections import Counter
>>> from typing import TypedDict
>>> class t(TypedDict):
... a: Counter | None
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in t
TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'
>>>
I have also attempted to build the docs removing this commit on my local
setup (outside of the Poetry shell) and it appears to be working with no
problems.
Best,
Luca
[1] https://peps.python.org/pep-0604/
