python-替换txt文件内容-我的学习python之路

#!/usr/bin/python

import re

f1=open('a.txt','r+')

f2=f1.readlines()

reg=r'hello'

f4=open('a2.txt','w+')

#def tihuan(f3):

for i in f2:

f3=re.sub(reg,'csvt',i)

print f3

# f4.write(re.sub(reg,'csvt',i))

f4.write(f3)

f1.close()

f4.close()