python 重载 __hash__ __eq__

__author__ = 'root'

from urlparse import urlparse





class host_news():



    def __init__(self, id, url):

        self.id = id

        urlinfo = urlparse(url)

        self.host = urlinfo.hostname

        self.url = url



    def __init__(self, id, host, url):

        self.id = id

        self.host = host

        self.url = url



    def __eq__(self, other):

        return self.host == other.host



    def __hash__(self):

        return self.host.__hash__()



    def __str__(self):

        return 'id:%s   host:%s url:%s' % (self.id, self.host, self.url)





if __name__ == '__main__':

    o1 = host_news(0, 'www'*2, 'www.1')

    o2 = host_news(0, 'www'*2, '100')

    o3 = host_news(1, 'qqq'*2, '10000')

    print o1 is o2

    print o1 == o2



    t = [o1, o3]

    print o2 in t

# 注释掉__hash__ __eq__ 结果就全是false