python中迭代器（iterator）用法实例分析_Python

python中迭代器（iterator）用法实例分析

2020-06-16 09:55重负在身 Python

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( '\n\nPress Enter to exit...' )