sqlalchemyデータベース作成エラー

私は作業しているプロジェクトがあり、私はすべてのテーブルとデータベースを作成できない小さなエラーが発生しています。sqlalchemyデータベース作成エラー

[email protected]:/vagrant/PayUp$ python setup_database.py 
Traceback (most recent call last): 
    File "setup_database.py", line 22, in <module> 
    class Users(Base): 
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/api.py", line 50, in __init__ 
    _as_declarative(cls, classname, cls.__dict__) 
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/base.py", line 227, in _as_declarative 
    if not table.c.contains_column(c): 
AttributeError: 'str' object has no attribute 'c'

、私は次のようである使用していますコード：

#The following are all of the standard imports that are needed to run the database 
import os 
import sys 
from sqlalchemy import Column, ForeignKey, Integer, String, Index 
from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy.orm import relationship 
from sqlalchemy import create_engine 

#The following is what will create the declarative_base base that will be imported to every tables 
Base = declarative_base() 

#The following is the user table which will store the users id and username 
class Users(Base): 
    __table__ = 'users' 

    id = Column(Integer, primary_key = True) 
    user_name = Column(String(16), nullable = False, unique = True, index = True) 

class User_Auth(Base): 
    __table__ = 'user_auth' 

    id = Column(Integer, primary_key = True) 
    last_name = Column(String(16), nullable = False) 
    first_name = Column(String(16), nullable = False) 
    password = Column(String(225), nullable = False) 

class User_Info(Base): 

    __table__ = 'user_info' 

    id = Column(Integer, primary_key = True) 
    email = Column(String(50), nullable = False, index = True, unique = True) 
    phone = Column(Integer(12), nullable = True, unique = True) 
    age = Column(Integer(2), nullable = False) 
    gender = Column(String(2), nullable = True) 

class User_Location(Base): 
    __table__ = 'user_location' 

    id = Column(Integer, primary_key = True) 
    street = Column(String(200), mullable = False) 
    city = Column(String(35), nullable = False) 
    state = Column(String(3), nullable = False) 
    zip_code = Column(Integer(5), nullable = False, index = True) 


engine = create_engine('sqlite:///payup.db') 

Base.metadata.create_all(engine)

出典

2016-10-15 omar jandali