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）
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【听图阁-专注于Python设计】网站的支持！
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