python 抽象类、抽象方法的实现

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

from abc import ABCMeta, abstractmethod

#抽象类
class Headers(object):
__metaclass__ = ABCMeta

def __init__(self):
self.headers = ''

@abstractmethod
def _getBaiduHeaders(self):pass

def __str__(self):
return str(self.headers)

def __repr__(self):
return repr(self.headers)

#实现类
class BaiduHeaders(Headers):
def __init__(self, url, username, password):
self.url = url
self.headers = self._getBaiduHeaders(username, password)

def _getBaiduHeaders(self, username, password):
client = GLOBAL_SUDS_CLIENT.Client(self.url)
headers = client.factory.create('ns0:AuthHeader')
headers.username = username
headers.password = password
headers.token = _baidu_headers['token']
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