python中迭代器（iterator）用法实例分析
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:KevinHarris
#LastModified:03/11/04
#Description:ThisPythonscriptdemonstrateshowtouseiterators.
#---------------------------------------
myTuple=(1,2,3,4)
myIterator=iter(myTuple)
print(next(myIterator))
print(next(myIterator))
print(next(myIterator))
print(next(myIterator))
#Becareful,onemorecalltonext()
#andthisscriptwillthrowanexception!
#printmyIterator.next()
print("")
#---------------------------------------
#Ifyouhavenoideahowmanyitems
#canbesafelyaccesdviatheiterator,
#useatry/exceptblocktokeepyourscriptfromcrashing.
myTuple2=("one","two","three","four")
myIterator2=iter(myTuple2)
while1:
try:
print(next(myIterator2))
exceptStopIteration:
print("Exceptioncaught!Iteratormustbeempty!")
break
input('\n\nPressEntertoexit...')
希望本文所述对大家的Python程序设计有所帮助。