python 迭代器

# !/usr/bin/env python
# -*- coding: utf-8 -
class MyIterator(object):
    def __init__(self,step):
        self.step=step
    def next(self):
    ##发回下一个元素
      if self.step == 0:
         raise StopIteration
      self.step -=1
      print '-------------'
      print 1+self.step+1
      print '-------------'
      return self.step
    def __iter__(self):
         return self
for e1 in MyIterator(4):
    print e1


C:Python27python.exe "C:/Users/TLCB/PycharmProjects/untitled/mycompany/baidu api/a3.py"
-------------
5
-------------
3
-------------
4
-------------
2
-------------
3
-------------
1
-------------
2
-------------
0

Process finished with exit code 0