[Python] Why does mypy does not work with sqlalchemy?

I have the following code (snippet):

from sqlalchemy.orm import declarative_base

Base = declarative_base()


with pip I installed

$ pip install -U sqlalchemy[mypy] sqlalchemy-stubs mypy
$ pip list | egrep -i '(sqlal|mypy)'
mypy 0.982
mypy-extensions 0.4.3
SQLAlchemy 1.4.42
sqlalchemy-stubs 0.4
SQLAlchemy-Utils 0.38.3
sqlalchemy2-stubs 0.0.2a29


Still, when running mypy file.py, I'm getting:

$ python3 -mmypy test.py
test.py:1: error: Module "sqlalchemy.orm" has no attribute "declarative_base"
Found 1 error in 1 file (checked 1 source file)


I'm using Python 3.10.5 from within a virtualenv.

What can I do to debug more?

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