方式一：原文件修改

def change_file(file,old_str,new_str):
"""
param file:文件名
param old_str:旧字符串
param new_str:新字符串
"""
file_data = ""
with open(file, "r", encoding="utf-8") as f:
for line in f:
if old_str in line:
line = line.replace(old_str,new_str)
file_data += line
with open(file,"w",encoding="utf-8") as f:
f.write(file_data)

change_file("filename", "12345", "xxxxx")

方式二：新文件替换

import os
def change_file(file,old_str,new_str):
"""
将替换的字符串写到一个新的文件中，然后将原文件删除，新文件改为原来文件的名字
:param file: 文件路径
:param old_str: 需要替换的字符串
:param new_str: 替换的字符串
:return: None
"""
with open(file, "r", encoding="utf-8") as f1,open("%s.bak" % file, "w", encoding="utf-8") as f2:
for line in f1:
if old_str in line:
line = line.replace(old_str, new_str)
f2.write(line)
os.remove(file)
os.rename("%s.bak" % file, file)

chnage_file("filename", "12345", "xxxxx")

方式三：正则（属于第二种方式）

import re,os
def change_file(file,old_str,new_str):
with open(file, "r", encoding="utf-8") as f1,open("%s.bak" % file, "w", encoding="utf-8") as f2:
for line in f1:
f2.write(re.sub(old_str,new_str,line))
os.remove(file)
os.rename("%s.bak" % file, file)
change_file("filename", "12345", "xxxxx")

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原文链接：https://blog.csdn.net/qq_37117595/article/details/127800887