SQLAlchemy─根据多个表映射类

# ! /usr/bin/env python
# -*- coding: utf-8 -*-
# login_frontend.py

""" Python        2.7.3
    Cherrypy      3.2.2
    PostgreSQL    9.1
    psycopy2      2.4.5
    SQLAlchemy    0.7.10
"""
# ! /usr/bin/env python
# -*- coding: utf-8 -*-