TypeError: 'type' object is not subscriptable in python 3.8

[danielyan86129]

After install 0.2.1, from taskgroup import TaskGroup as AsyncioTaskGroup will fail with this error:

(py38) ➜  ~ python3                                
Python 3.8.19 (default, Mar 20 2024, 19:58:24) 
[GCC 11.2.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from taskgroup import TaskGroup as AsyncioTaskGroup
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/yajieyan/miniconda3/envs/py38/lib/python3.8/site-packages/taskgroup/__init__.py", line 9, in <module>
    from .runners import run, Runner
  File "/home/yajieyan/miniconda3/envs/py38/lib/python3.8/site-packages/taskgroup/runners.py", line 22, in <module>
    from .tasks import task_factory as _task_factory
  File "/home/yajieyan/miniconda3/envs/py38/lib/python3.8/site-packages/taskgroup/tasks.py", line 18, in <module>
    _TaskYieldType: TypeAlias = Optional[asyncio.Future[object]]
TypeError: 'type' object is not subscriptable

[danielyan86129]

Instead version 0.0.0a4 works.

[graingert]

yes, Python 3.8 is EOL @danielyan86129

[graingert]

@danielyan86129 can you test 0.2.2? Also why are you using an EOL python version?