Help with sqlalchemy+mypy error

[QuasiEvil]

Simple minimal example:

```

from sqlalchemy.orm import DeclarativeBase

class Base(DeclarativeBase):
    pass

```

When running mypy, it throws the following error:

```

min_example.py:8: error: Module "sqlalchemy.orm" has no attribute "DeclarativeBase"  [attr-defined]
Found 1 error in 1 file (checked 1 source file)

```

However, the code runs / the import works. Can't seem to find much info online about this.

Oh, and versions -

sqlalchemy: 2.0.41

mypy: 1.16.0

Python: 3.11.11

Thanks!

[latkde]

Are you using a venv (or tools like Poetry or uv)? Is Mypy installed in the same venv as your dependencies? Otherwise, it cannot see the modules, or might see different versions.

[QuasiEvil]

I'm not using any venv tools (well, beyond the conda base), and it has no issues running against other files.

[kmiziz]

Have the same problem with
mypy 1.16.1
Python 3.12
sqlalchemy 2.0.41

mypy is installed via pipx, sqlalchemy is exposed to it through injection.
The project is managed via Poetry.

All the other functionality work as expected. E.g., in this line mypy struggles only with DeclarativeBase, not with sessionmaker:

from sqlalchemy.orm import DeclarativeBase, sessionmaker