python 抽象类、抽象方法的实现

python

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

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