Python文件操作中进行字符串替换（保存到新文件/当前文件）
题目：
- 首先将文件：
/etc/selinux/config进行备份 文件名为/etc/selinux/config.bak - 再文件：
/etc/selinux/config中的enforcing替换为disabled
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=enforcing
- 方法一：用
replace
import os
import shutil
def selinux_config():
"""
关闭SELINUX
修改文件内容
:return:
"""
file_selinux = '/etc/selinux/config'
backup_file_selinux = file_selinux + '.bak'
temp_file_selinux = file_selinux + '.temp'
if not os.path.exists(backup_file_selinux):
shutil.copy2(file_selinux, backup_file_selinux)
with open(file_selinux, mode='r') as fr, open(temp_file_selinux, mode='w') as fw:
origin_line = 'SELINUX=enforcing'
update_line = 'SELINUX=disabled'
for line in fr:
fw.write(line.replace(origin_line, update_line))
os.remove(file_selinux)
os.rename(temp_file_selinux, file_selinux)
if __name__ == '__main__':
selinux_config()
- 方法二：用
re.sub
#! /usr/bin/env python
# -*- coding: utf-8 -*-
import os
import re
import shutil
def selinux_config():
"""
关闭SELINUX
修改文件内容
:return:
"""
file_selinux = '/etc/selinux/config'
backup_file_selinux = file_selinux + '.bak'
temp_file_selinux = file_selinux + '.temp'
if not os.path.exists(backup_file_selinux):
shutil.copy2(file_selinux, backup_file_selinux)
with open(file_selinux, mode='r') as fr, open(temp_file_selinux, mode='w') as fw:
origin_line = 'SELINUX=enforcing'
update_line = 'SELINUX=disabled'
for line in fr:
re_sub_list = re.sub(origin_line, update_line, line) # 这里用re.sub进行替换后放入 re_sub_list中
fw.writelines(re_sub_list) # 将列表中的每一行进行写入。writelines是将序列对象中的每一行进行写入。
os.remove(file_selinux)
os.rename(temp_file_selinux, file_selinux)
if __name__ == '__main__':
selinux_config()
