python--迭代器的实现

#!/usr/local/python/bin/python3
"""
一个迭代器的例子
"""

class exsample(object):
"""
exsample 类实现迭代功能
__iter__返回一个迭代器
__next__定义每一次迭代要返回的值
"""
def __init__(self,counter=10):
self.index=0
self.counter=counter

def __iter__(self):
return self

def __next__(self):
if self.index <self.counter:
self.index=self.index+1
return self.index -1
else:
raise StopIteration()

if __name__=="__main__":
for x in exsample():
print(x)

[root@workstudio tmp]# ./main.py
0
1
2
3
4
5
6
7
8
9