python中迭代器（iterator）的用法，pythoniterator,#-----------

python中迭代器（iterator）的用法，pythoniterator,#-----------

#------------------------------------------------------------------------------#           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!" )        breakinput( '\n\nPress Enter to exit...' )