python统计文本中的单词数和print的两种写法

#!/usr/bin/python# - * - coding: utf-8 - * -#作用，分别计算每个文本的单词数，并且输出所有文本的单词总数a = []sum = 0def count_words(filename):#filename = '1.txt' try:  with open(filename) as file_object:   t = file_object.read() except IOError:  print 'you have' + ' ' + filename + ' is not exist!' else:  words = t.split()  numbers = len(words)  a.append(numbers)    #print的两种写法，可以带逗号，后面直接跟参数值。也可以不带逗号，后面直接跟%参数值  print 'danci de geshi yigong shi %d'  %numbers#    #print 'danci de geshi yigong shi' , numbersfilenames = [ '1.txt','2.txt','3.txt' ]for filename in filenames: count_words(filename)for i in a: sum += int(i)print sum#两种写法，一个是用sum计数，一个用sum函数，#sum的参数是一个list，这里a就是list#print '所有单词总数为' + str(sum(a))