Which OS should it used?

[zongbb1983]

Which OS should it used? Windows or Linux? or something else? For I used it under the Windows system, this error occured.

Traceback (most recent call last):
File "C:\Users\jack\PycharmProjects\flask-main\src\flask\app.py", line 7, in
import typing as t
File "C:\Users\jack\PycharmProjects\flask-main\src\flask\typing.py", line 5, in
if t.TYPE_CHECKING: # pragma: no cover
AttributeError: partially initialized module 'typing' has no attribute 'TYPE_CHECKING' (most likely due to a circular import)

[CheeseCake87]

You need to change the name of your typing.py file to something other than the name of the package you are trying to use.

[mikebionic]

Try adding dot before package

import .typing as t