python的接口实现zope.interface示例
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()
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