python----iter\next

#!coding:utf-8
#!python version 2.7

class mysqence(object):
    def __init__(self,start,stop):
        self.start=start
        self.stop=stop
        self.current=start
    def __iter__(self):
        return self
    def next(self):
        ‘‘‘如果是python3.0环境，它已经不在用next了，而是把名字改成__next__‘‘‘
        current=self.current
        if current <= self.stop:
            self.current=self.current+1
            return current
        else:
            raise StopIteration

for x in mysqence(1,5):
    print x