mypy error: Argument 1 to "fileConfig" has incompatible type "Optional[str]"

[scratchmex]

Describe the bug

start with alembic init migrations and you will get the error. Basically fileConfig expects an str not None. By default when alembic is called via the cli the parameter is filled with alembic.ini but in the class definition of Config by default is None

Expected behavior

To Reproduce
Please try to provide a Minimal, Complete, and Verifiable example, with the migration script and/or the SQLAlchemy tables or models involved.
See also Reporting Bugs on the website.

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Error

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Versions.

• OS:
• Python:
• Alembic: alembic 1.7.6
• SQLAlchemy:
• Database:
• DBAPI:

Additional context

Have a nice day!

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the main branch:

add conditional for fileConfig() https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/3578

[zzzeek]

sure thing