sqlalchemy postgresql enum does not create type on db migrate

I decided on this problem using that.

I changed the code of migration, and migration looks like this:

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

def upgrade():
    banner_status = postgresql.ENUM('active', 'inactive', 'archive', name="banner_status")
    banner_status.create(op.get_bind())

    op.add_column('banner', sa.Column('status', sa.Enum('active', 'inactive', 'archive', name="banner_status"), nullable=True))

def downgrade():
    op.drop_column('banner', 'status')

    banner_status = postgresql.ENUM('active', 'inactive', 'archive', name="banner_status")
    banner_status.drop(op.get_bind())

And now python manage.py db upgrade\downgrade is successfully executed.