1.the using of exception
2.file opration
import os >>> try: data = open(‘sketch.txt‘) for each in data: try: (role,message) = each.split(‘:‘) print(role + ‘ says: ‘ + message, end=‘‘) except ValueError: pass data.close() except IOError: print(‘file is missing‘)
you can get the sketch.txt from the python offical webstatie
Learn Python From 'Head First Python' [3] : Exception
原文：http://www.cnblogs.com/zhuojiniao/p/3961659.html