sqlalchemy enum AttributeError: 'list' object has no attribute 'replace'

在column中使用Enum:

class User(Base):
    __tablename__ = 'user'
 
    USER_ROLE_CHOICES = ['SU', 'GA', 'CU']
 
    id = Column(Integer, primary_key=True)
    password = Column(String(128))
    last_login = Column(DateTime)
    is_superuser = Column(Boolean)
    username = Column(String(30), unique=True)
    first_name = Column(String(30))
    last_name = Column(String(30))
    email = Column(String(30))
    is_staff = Column(Boolean)
    is_active = Column(Boolean)
    date_joined = Column(DateTime)
    role = Column(Enum(USER_ROLE_CHOICES))  #AttributeError: 'list' object has no attribute 'replace'
    group = relationship('UserGroup',
                         secondary=user_usergroup,
                         backref='user')

在stackoverflower上找了一下，发现这么用可以：

role = Column(Enum('SU', 'GA', 'CU'))