The example “fastapi-sqlalchemy” cannot be executed ...

[hustlmh]

hi, I cloned the git-master code and try to run the example without any modification in my miniconda environment where python version is 3.8.11, but the example “fastapi-sqlalchemy” cannot be executed.
The error message is "TypeError: 'ABCMeta' object is not subscriptable".
related environment is
uvicorn 0.15.0
fastapi 0.68.1
dependency-injector 4.36.0

how to fix it ?
Thanks !

fastapi-sqlalchemy % python -m webapp.application

Traceback (most recent call last):
File "/Users/zoo/miniconda3/envs/gui/lib/python3.8/runpy.py", line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/Users/zoo/miniconda3/envs/gui/lib/python3.8/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/Users/zoo/Downloads/python-dependency-injector-master/examples/miniapps/fastapi-sqlalchemy/webapp/application.py", line 5, in
from .containers import Container
File "/Users/zoo/Downloads/python-dependency-injector-master/examples/miniapps/fastapi-sqlalchemy/webapp/containers.py", line 5, in
from .database import Database
File "/Users/zoo/Downloads/python-dependency-injector-master/examples/miniapps/fastapi-sqlalchemy/webapp/database.py", line 16, in
class Database:
File "/Users/zoo/Downloads/python-dependency-injector-master/examples/miniapps/fastapi-sqlalchemy/webapp/database.py", line 32, in Database
def session(self) -> Callable[..., AbstractContextManager[Session]]:
TypeError: 'ABCMeta' object is not subscriptable

[rmk135]

Thanks for reporting the issue @hustlmh . After a quick search, I found that adding from __future__ import annotations might help as a workaround. I didn't test it yet. A dirtier but 100% working fix is to just remove type annotations from line 32:

    @contextmanager
    def session(self) -> Callable[..., AbstractContextManager[Session]]:

I'll also try to see how to make it work on all supported Python versions. Thanks again.

[vlio20]

@rmk135 where should this import be set?
@hustlmh , did it work for you?