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 osimport shutildef 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 osimport reimport shutildef 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网站的支持！
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