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: 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...' )
希望本文所述对大家的Python程序设计有所帮助。