Alembic migration for modifying a Enum field

alter_enum_alembic_mysql.py

from alembic import op
import sqlalchemy as sa


def upgrade():
    op.alter_column(table_name='items', column_name='status', nullable=False, server_default="pending_with_moderator", name="status",
    				type_=sa.types.Enum('pending_with_moderator','pending_with_user','awaiting_user_modification','awaiting_moderator_modification','approved'),
    				existing_type=sa.types.Enum('pending_with_moderator', 'pending_with_user', 'approved'),existing_server_default="pending_with_moderator",
    				existing_nullable=False)


def downgrade():
    op.alter_column(table_name='items', column_name='status', nullable=False, server_default="pending_with_moderator", name="status",
    	existing_type=sa.types.Enum('pending_with_moderator','pending_with_user','awaiting_user_modification','awaiting_moderator_modification','approved'),
    				type_=sa.types.Enum('pending_with_moderator', 'pending_with_user', 'approved'),existing_server_default="pending_with_moderator",
    				existing_nullable=False)