现有plain text titled test.txt，统计其中的单词出现的个数。

test.txt的内容：

i have have application someday oneday day demo

i have some one coma ideal naive i

用python实现的代码：

import re

count = {}

f = open('test','r')

b = f.read()

#print b

cd = re.split('[ \\n]+',b) #注意split的用法

print cd

for i in cd:

count[i] = count.get(i,0) + 1#注意get()方法的用法

print count

执行代码后得到的结果：

['i','have','application','someday','oneday','day','demo','i','some','one','coma','ideal','naive','i']

{'someday': 1,'i': 3,'demo': 1,'naive': 1,'some': 1,'one': 1,'application': 1,'ideal': 1,'have': 3,'coma': 1,'oneday': 1,'day': 1}

shell实现的方法为：

tr " " "\\n"

运行结果为

1 application

1 coma

1 day

1 demo

3 have

3 i

1 ideal

1 naive

1 one

1 oneday

1 some

1 someday