python支持多继承，但是不支持接口，zope.inteface是其三方的接口实现库，在twisted中有大量使用
from zope.interface import Interface from zope.interface import implementer import socket class IHostNameResolver(Interface): def getHostByName(name, timeout = (1, 3, 11, 45)): # 可以不用self """ Resolve the domain name C{name} into an IP address. """ """ 类装饰器等价于：implementer(IHostNameResolver)(HostNameResolver) """ @implementer(IHostNameResolver) class HostNameResolver: def getHostByName(self, name, timeout = (1, 3, 11, 45)): try: address = socket.gethostbyname(name) except socket.error: return 'none' else: return address resolver = HostNameResolver() print resolver.getHostByName('localhost') # 判断HostNameResolver是否实现了接口IHostNameResolver print IHostNameResolver.implementedBy(HostNameResolver) # True, 调用 SpecificationBasePy.implementedBy()
