在学习C的时候，我们经常会做这样的算法题来提高我们的编程能力，然而在python中使用封装好的类库，就可以简单完成。
需要的模块有：re :该模块可以通过一定的规则寻找目标 Counter主要是用于统计个数
代码：
#coding:utf-8
import re
from collections import Counter
filePath = './sound.txt'
def getCountWords(file):
"统计输入文件内容中单词的个数"
pattern = "[A-Za-z]+|\$?\d+%?$"
with open(file) as f:
r = re.findall(pattern,f.read())
print r
print '*'*20
return Counter(r).most_common()
if __name__ == '__main__':
print getCountWords(filePath)
sound.txt中的内容为：
When I was young I'd listen to the radio
Waiting for my favorite songs
When they played I'd sing along,
It make me smile.
Those were such happy times and not so long ago
How I wondered where they'd gone.
But they're back again just like a long lost friend
All the songs I love so well.
Every shalala every wo'wo
still shines.
Every shing-a-ling-a-ling that they're starting to sing
so fine
When they get to the part
where he's breaking her heart
It can really make me cry
just like before.
It's yesterday once more.
(Shoobie do lang lang)
Looking bak on how it was in years gone by
And the good times that had
makes today seem rather sad,
So much has changed.
It was songs of love that I would sing to them
And I'd memorise each word.
Those old melodies still sound so good to me
As they melt the years away
Every shalala every wo'wo still shines
Every shing-a-ling-a-ling that they're startingTo sing
so fine
All my best memorise come back clearly to me
Some can even make me cry
just like before.
It's yesterday once more.
(Shoobie do lang lang)
Every shalala every wo'wo still shines.
Every shing-a-ling-a-ling that they're starting to sing
so fine
Every shalala every wo'wo still shines.
Every shing-a-ling-a-ling that they're starting to sing
so fine
昨日重现 (中文歌词) 歌手:卡朋特
年少时我喜欢听着收音机 等候我喜欢的歌曲轻轻响起
我独自为它伴唱 让我感到欢喜 这样的幸福时光早已远去
我多想知道他们到了那里？ 象失散朋友再次回来 所有的歌曲
我还是那样喜欢 每一句 sha la la la 每一句wo wo 仍散发光芒
每一句sing aling aling 他们唱得还是如此动听
当歌曲演绎到 伤心的地方 确实让我哭泣 这是 昨日重现啊
回头看看走过的这些时光 幸福记忆让今天的我很感伤 有太多已经改变
那首我曾为他唱的爱情歌曲 每句歌词还印在我脑海里
那些旧的记忆依旧那么美妙 为我带走 这么多年的忧伤
每一句 sha la la la 每一句wo wo 仍散发光芒
每一句sing aling aling 他们唱得还是如此动听 所有美妙回忆
清晰向我袭击 一些确实让我哭泣 就象以前那样 这是昨日重现啊
结果为：
