python中迭代器iterator用法实例分析

这篇文章主要介绍了python中迭代器（iterator）用法,实例分析了Python中迭代器的相关使用技巧,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了python中迭代器（iterator）用法。分享给大家供大家参考。具体如下：

#--------------------------------------- # Name: iterators.py # Author: Kevin Harris # Last Modified: 03/11/04 # Description: This Python script demonstrates how to use iterators. #--------------------------------------- myTuple = (1, 2, 3, 4) myIterator = iter( myTuple ) print( next( myIterator ) ) print( next( myIterator ) ) print( next( myIterator ) ) print( next( myIterator ) ) # Becareful, one more call to next() # and this script will throw an exception! #print myIterator.next() print( " " ) #--------------------------------------- # If you have no idea how many items # can be safely accesd via the iterator, # use a try/except block to keep your script from crashing. myTuple2 = ( "one", "two", "three", "four" ) myIterator2 = iter( myTuple2 ) while 1: try: print( next( myIterator2 ) ) except stopiteration: print( "Exception caught! Iterator must be empty!" ) break input( 'nnPress Enter to exit...' )

希望本文所述对大家的Python程序设计有所帮助。