题目：

1.首先将文件：/etc/selinux/config 进行备份 文件名为 /etc/selinux/config.bak

2.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()

总结

以上所述是小编给大家介绍的Python文件操作中进行字符串替换的方法(保存到新文件/当前文件) ,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

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