#StackBounty: #python #sqlalchemy #mypy How to resolve mypy error with sqlalchemy enum?

Bounty: 250

mypy reports an error in the following code:

import enum
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Enum

Base = declarative_base()

class MyEnum(enum.Enum):
    A = 1
    B = 2

class MyTable(Base):
    __tablename__ = 'my_table'

    col = Column(Enum(MyEnum), nullable=False)

c = MyTable(col=MyEnum.A)

Following is the error:

a.py:16: error: Incompatible type for "col" of "MyTable" (got
"MyEnum", expected "str")

How do I make this error go away without adding a "type: ignore" ? I could also replace MyEnum.A with MyEnum.A.name to make the error go away. But this doesn’t look clean and is also not suggested in sqlalchemy documentation.


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