如何使用sqlalchemy-migrate编写alter column name migration？

pip install sqlalchemy-migrate

migrate.py create <migration_name>

from sqlalchemy import MetaData, Table, Column, String
from sqlalchemy.sql.ddl import AlterColumn
from sqlalchemy_migrate import upgrade, downgrade

metadata = MetaData()

# 定义User表
user_table = Table('user', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String(50)),
    Column('email', String(100))
)

# 定义重命名操作
rename_email_column = AlterColumn('user', 'email', new_column_name='email_address')

# 定义upgrade()方法
def upgrade(migrate_engine):
    metadata.bind = migrate_engine
    user_table.c['email'].alter(name='email_address')

# 定义downgrade()方法
def downgrade(migrate_engine):
    metadata.bind = migrate_engine
    user_table.c['email_address'].alter(name='email')

migrate.py upgrade <migration_name>

migrate.py downgrade <migration_name>