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

''' 遇到问题没人解答？小编创建了一个Python学习交流QQ群：778463939 寻找有志同道合的小伙伴，互帮互助,群里还有不错的视频学习教程和PDF电子书！ ''' import os import 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 os import re import 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()

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