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。