Python----iter\next

1, Description: __getitem__\setitem can iterate, it has not been recommended; __iter__\next is recommended.

2, Python will first check __iter__\next and then go to check __getitem__\__setitem__, that is __iter__ priority.

Example:

#!coding:utf-8#!python version 2.7classmysqence (object):def __init__(self,start,stop): Self.start=Start Self.stop=Stop Self.current=Startdef __iter__(self):return SelfdefNext (self):" "if it's a python3.0 environment, it's not using next anymore, it's changing the name to __next__." " Current=self.currentifCurrent <=self.stop:self.current=self.current+1return CurrentElse:            Raisestopiteration forXinchMysqence (1,5):    PrintX

Python----iter\next