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：
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sorted(dict.items(),key=lambda k:k[1],reverse=True)
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按照value值升序排序：
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sorted(dict.items(),key=lambda k:k[1],reverse=False)
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或者
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sorted(dict.items(),key=lambda k:k[1])
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按照key值降序排列：
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sorted(dict.items(),key=lambda k:k[0],reverse=True)
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按照key值升序排列：
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sorted(dict.items(),key=lambda k:k[0])
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或者
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sorted(dict.items(),key=lambda k:k[0],reverse=False)
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Python示例：
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# -*- 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
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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)]
希望本文所述对大家Python程序设计有所帮助。
原文链接：http://www.cnblogs.com/hanxiaomin/p/6132270.html