>
> use the PG ENUM type instead and add create_type=False: 
>
> from sqlalchemy.dialects.postgresql import ENUM 
>
> ENUM(‘male’, ‘female’, name=‘gt’, create_type=False) 
>

This method didn't work for me. The safest way I could find is to manually 
edit the autogenerated script, removing the reference to the column, and 
then adding the column manually later using op.execute. 

For example:
op.execute("ALTER TABLE ModelB ADD gender gender_type")

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