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:
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#--------------------------------------- # 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。