使用tuple统计文件中单词的个数

 name = input("Enter file:")
 if len(name) < 1 : name = "input.txt"
 fhand = open(name)

 counts = dict()
 for line in fhand:
     words = line.split()
     for word in words:
         # find the value that key is word, if not, return 0
         counts[word] = counts.get(word, 0) + 1

 lst = list()
 for key, val in counts.items():
     lst.append( (val, key) )

 lst.sort(reverse = True)
 for val, key in lst[:10]:
     print (key, val)