python建立sqlite表格出错,新手问题

>>> engine = create_engine('sqlite:///./yanf.db',echo=True)

metadata = MetaData(engine)
users_table=Table('users',metadata,
... Column(id,Integer,primary_key=True),
... Column('name',String(40)),
... Column('email',String(40)))
Traceback (most recent call last):
File "", line 2, in
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/schema.py", line 1092, in init
self._init_items(*args)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/schema.py", line 72, in _init_items
item._set_parent_with_dispatch(self)
AttributeError: 'builtin_function_or_method' object has no attribute '_set_parent_with_dispatch'

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