由于python 没有抽象类、接口的概念，所以要实现这种功能得abc.py 这个类库,具体方式如下

1 from abc import ABCMeta, abstractmethod 2  3 #抽象类 4 class Headers(object): 5     __metaclass__ = ABCMeta 6  7     def __init__(self): 8         self.headers = '' 9 10     @abstractmethod11     def _getBaiduHeaders(self):pass12 13     def __str__(self):14         return str(self.headers)15 16     def __repr__(self):17         return repr(self.headers)18 19 #实现类20 class BaiduHeaders(Headers):21     def __init__(self, url, username, password):22         self.url = url23         self.headers = self._getBaiduHeaders(username, password)24 25     def _getBaiduHeaders(self, username, password):26         client = GLOBAL_SUDS_CLIENT.Client(self.url)27         headers = client.factory.create('ns0:AuthHeader')28         headers.username = username29         headers.password = password30         headers.token = _baidu_headers['token']31         return headers

如果子类不实现父类的_getBaiduHeaders方法,则抛出TypeError: Can't instantiate abstract class BaiduHeaders with abstract methods  异常