python 文件替换

#/usr/bin/python
#coding:utf8

#文件内容替换练习
#1.把a.t中的hello替换为csvt,并保存到文件a2.t中。
#2.把a.t中的hello替换为csvt,并保存到原文件中去。

#problem1:

fp1 = file("a.t","r")
fp2 = file("a2.t","w")

for s in fp1.readlines():
fp2.write(s.replace("hello","csvt"))
fp1.close()
fp2.close()
#problem2:
fp3 = file("a.t","r+")
s = fp3.read()
fp3.seek(0,0)
fp3.write(s.replace("hello","i love u"))
fp3.close()

[user1@localhost ~]$ ls
a.t Documents Music Pictures Templates Videos
a.t~ Downloads new.txt Public test.txt
Desktop filefindreplace.py new.txt~ replace.py test.txt~
[user1@localhost ~]$ rm a.t~
[user1@localhost ~]$ rm new.txt~
[user1@localhost ~]$ rm test.txt~
[user1@localhost ~]$ ls
a.t Documents filefindreplace.py new.txt Public Templates Videos
Desktop Downloads Music Pictures replace.py test.txt
[user1@localhost ~]$ vim replace.py
[user1@localhost ~]$ python replace.py
[user1@localhost ~]$ ls
a2.t Desktop Downloads Music Pictures replace.py test.txt
a.t Documents filefindreplace.py new.txt Public Templates Videos
[user1@localhost ~]$ cat a2.t
csvt world
csvt csvt world
[user1@localhost ~]$

[user1@localhost Desktop]$ cd ~
[user1@localhost ~]$ ls
a2.t Desktop Downloads Music Pictures replace.py test.txt
a.t Documents filefindreplace.py new.txt Public Templates Videos
[user1@localhost ~]$ cat a.t
hello world
hello hello world
[user1@localhost ~]$ cat a2.t
csvt world
csvt csvt world
[user1@localhost ~]$ vim replace.py
[user1@localhost ~]$ python replace.py
[user1@localhost ~]$ cat a.t
i love u world
i love u i love u world
[user1@localhost ~]$ cat a2.t
csvt world
csvt csvt world
[user1@localhost ~]$