一、修改原文件方式
二、把原文件内容和要修改的内容写到新文件中进行存储的方式
2.1 python字符串替换的方法,修改文件内容
2.2 python 使用正则表达式 替换文件内容 re.sub 方法替换
# 传入文件(file),将旧内容(old_content)替换为新内容(new_content)
def replace(file, old_content, new_content):
content = read_file(file)
content = content.replace(old_content, new_content)
rewrite_file(file, content)
# 读文件内容
def read_file(file):
with open(file, encoding='UTF-8') as f:
read_all = f.read()
f.close()
return read_all
# 写内容到文件
def rewrite_file(file, data):
with open(file, 'w', encoding='UTF-8') as f:
f.write(data)
f.close()
# 替换操作(将test.txt文件中的'Hello World!'替换为'Hello Qt!')
replace(r'test.txt', 'Hello World!', 'Hello Qt!')
import pickle
def ReadAllContent(path):
f = open(path,"r")
txt = f.read()
f.close()
return txt
def WriteAllContent(path, content):
file = open(path,"w")
file.write(content)
file.close()
def UpdateFile(path,targetContent,replaceContent):
"""
read file
if find
replace
write to file
"""
print("src file: {0}".format(path))
content = ReadAllContent(path)
contentIndex = content.find(targetContent)
print("contentIdnex: {0}".format(contentIndex))
if contentIndex > 0:
WriteAllContent(path, content.replace(targetContent,replaceContent))
#!/usr/bin/python
# coding=utf-8
import re
import os
s = os.sep
root = os.getcwd()
for root,dirs,files in os.walk(root):
for name in files:
if name.endswith(".java"):
print(os.path.join(root, name))
a= open(os.path.join(root, name),'r') #打开所有文件
str = a.read()
str = str.replace('sdfsdf','sdf')
b = open(os.path.join(root, name),'w')
b.write(str) #再写入
b.close() #关闭文件
一、修改原文件方式
def alter(file,old_str,new_str):
"""
替换文件中的字符串
:param file:文件名
:param old_str:就字符串
:param new_str:新字符串
:return:
"""
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)
alter("file1", "09876", "python")
二、把原文件内容和要修改的内容写到新文件中进行存储的方式
2.1 python字符串替换的方法,修改文件内容
import os
def alter(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)
alter("file1", "python", "测试")
2.2 python 使用正则表达式 替换文件内容 re.sub 方法替换
import re,os
def alter(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)
alter("file1", "admin", "password")