本文实例讲述了Python读取英文文件并记录每个单词出现次数后降序输出。分享给大家供大家参考，具体如下：

对文中出现的句号，逗号和感叹号做了相应的处理

sorted排序函数用法：

按照 value 值降序排列：

sorted(dict.items(),key=lambda k:k[1],reverse=True)

按照 value 值升序排序：

sorted(dict.items(),key=lambda k:k[1],reverse=False)

或者

sorted(dict.items(),key=lambda k:k[1])

按照 key 值降序排列：

sorted(dict.items(),key=lambda k:k[0],reverse=True)

按照 key 值升序排列：

sorted(dict.items(),key=lambda k:k[0])

或者

sorted(dict.items(),key=lambda k:k[0],reverse=False)

Python示例：

# -*- coding:utf-8 -*-
#! python2
file_object=open("english.txt")
dict={}
for line in file_object:
  line=line.replace(","," ")
  line=line.replace("."," ")
  line=line.replace("!"," ")
  strs= line.split();
  for str in strs:
    if dict.has_key(str):
      dict[str]+=1
    else:
      dict[str]=1
result=sorted(dict.items(),key=lambda k:k[1],reverse=True)
print result

english.txt文件：

We are busy all day, like swarms of flies without souls, noisy, restless, unable to hear the voices of the soul. As time goes by, childhood away, we grew up, years away a lot of memories, once have also eroded the bottom of the childish innocence, we regardless of the shackles of mind, indulge in the world buckish, focus on the beneficial principle, we have lost themselves.

运行结果：

[('the', 7), ('of', 6), ('we', 3), ('have', 2), ('away', 2), ('flies', 1), ('regardless', 1), ('restless', 1), ('up', 1), ('indulge', 1), ('mind', 1), ('all', 1), ('voices', 1), ('are', 1), ('in', 1), ('We', 1), ('busy', 1), ('shackles', 1), ('also', 1), ('memories', 1), ('by', 1), ('to', 1), ('unable', 1), ('goes', 1), ('themselves', 1), ('lot', 1), ('on', 1), ('buckish', 1), ('focus', 1), ('souls', 1), ('hear', 1), ('innocence', 1), ('world', 1), ('years', 1), ('day', 1), ('noisy', 1), ('a', 1), ('eroded', 1), ('grew', 1), ('like', 1), ('lost', 1), ('swarms', 1), ('bottom', 1), ('soul', 1), ('As', 1), ('without', 1), ('principle', 1), ('beneficial', 1), ('time', 1), ('childish', 1), ('childhood', 1), ('once', 1)]