原创测试开发ampampamp自动化测试规范（第四篇）

　　2.1.2.常用设计模式（python）创建型，主要是封装实现对象的创建
　　单例class Single(object):     ＂＂＂     单例     ＂＂＂     _instance=None     def __new__(cls,*args,**kwargs):         if cls._instance is None:             cls._instance = object.__new__(cls,*args,**kwargs)         return cls._instance 行为型，主要是对象间的协作关系
　　责任链class LogFilter(object):     def __init__(self, filters=None):         self._filters = []         if filters is not None:             self._filters = self._filters + filters      def filter(self, log_content):         for filter in self._filters:             filter.fileter(log_content)   class BlackListLogFilter(object):     @classmethod     def filter(cls, log_content):         print(＂black list filter is running＂)   class KeyWordsLogFilter(object):     @classmethod     def filter(cls, log_content):         print(＂key words filter is running＂)   log_filter=LogFilter([BlackListLogFilter, KeyWordsLogFilter]) log_filter.filter(log_content) 结构型，主要是组装现有的类、对象，增强功能达到目的
　　适配器def write_log(log, destination):     destination.write(log)   class MySqlLogWriter(object):     ＂＂＂     适配器，扩展desination使mysql具有日志写入功能     ＂＂＂     def __init__(self, conn):         self._mysql_con = conn      def write(self, log):         self._mysql_con.save(log)  mysql_writer=MySqlLogWriter(mysql_con) write_log(log,mysql_writer)