【python 练习】替换文件内容

最新推荐文章于 2021-01-14 15:30:42 发布

hometohw

最新推荐文章于 2021-01-14 15:30:42 发布

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分类专栏： python 文章标签： python input import fp file 工作

本文链接：https://blog.youkuaiyun.com/hometohw/article/details/7483404

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1.替换

import re
file_name='new  4.txt'
fp=open(file_name,'r')
alllines=fp.readlines()
fp.close()
fp=open(file_name,'w')
for eachline in alllines:
    a=re.sub('<host_ip>0.0.0.0</host_ip>','<host_ip>1.1.1.1</host_ip>',eachline)
    fp.writelines(a)
fp.close()

2.单行替换

import re
import os
filelist=['new  4.txt','new  5.txt']
workdir=input('please input WORK_HOME : ')
os.chdir(workdir)
ipold=input('Please input the old ip : ')
ipnew=input('Please input the new ip : ')
for filename in filelist:
    fp=open(filename,'r')
    alllines=fp.read()
    fp.close()
    fp=open(filename,'w')
    fp.writelines(re.sub(ipold,ipnew,alllines))
    fp.close()

3.多行替换

import re
import os
filelist=['new  4.txt','new  5.txt']
workdir=input('please input WORK_HOME : ')
os.chdir(workdir)
ipold=input('Please input the old ip : ')
ipnew=input('Please input the new ip : ')
for filename in filelist:
    fp=open(filename,'r')
    alllines=fp.readlines()
    fp.close()
    fp=open(filename,'w')
    fp.truncate()
    for eachline in alllines:
        fp.writelines(re.sub(ipold,ipnew,eachline))
    fp.close()

4.能用的

import re
import os
filelist=['new  4.txt','new  5.txt']
workdir=input('请输入工作目录，当前目录请直接按回车 : ')
if workdir!='':
    os.chdir(workdir)
oldip=input('请输入原来IP : ')
newip=input('请输入当前IP : ')
for filename in filelist:
    fp=open(filename,'r')
    alllines=fp.read()
    fp.close()
    fp=open(filename,'w')
    fp.writelines(re.sub(oldip,newip,alllines))
    fp.close()