Python设计模式之抽象工厂模式原理与用法详解

#!/usr/bin/env python# -*- coding:utf-8 -*-__author__ = 'Andy'"""大话设计模式设计模式――抽象工厂模式抽象工厂模式(Abstract Factory Pattern):提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们的类"""import sys#抽象用户表类class User(object):  def get_user(self):    pass  def insert_user(self):    pass#抽象部门表类class Department(object):  def get_department(self):    pass  def insert_department(self):    pass#操作具体User数据库类-Mysqlclass MysqlUser(User):  def get_user(self):    print 'MysqlUser get User'  def insert_user(self):    print 'MysqlUser insert User'#操作具体Department数据库类-Mysqlclass MysqlDepartment(Department):  def get_department(self):    print 'MysqlDepartment get department'  def insert_department(self):    print 'MysqlDepartment insert department'#操作具体User数据库-Orcalclass OrcaleUser(User):  def get_user(self):    print 'OrcalUser get User'  def insert_user(self):    print 'OrcalUser insert User'#操作具体Department数据库类-Orcalclass OrcaleDepartment(Department):  def get_department(self):    print 'OrcalDepartment get department'  def insert_department(self):    print 'OrcalDepartment insert department'#抽象工厂类class AbstractFactory(object):  def create_user(self):    pass  def create_department(self):    passclass MysqlFactory(AbstractFactory):  def create_user(self):    return MysqlUser()  def create_department(self):    return MysqlDepartment()class OrcaleFactory(AbstractFactory):  def create_user(self):    return OrcaleUser()  def create_department(self):    return OrcaleDepartment()if __name__ == "__main__":  db = sys.argv[1]  myfactory = ''  if db == 'Mysql':    myfactory = MysqlFactory()  elif db == 'Orcal':    myfactory = OrcaleFactory()  else:    print "不支持的数据库类型"    exit(0)  user = myfactory.create_user()  department = myfactory.create_department()  user.insert_user()  user.get_user()  department.insert_department()  department.get_department()