Python逐行更改目录中所有文件中的字符串

import os

def replace_string_in_files(directory, old_string, new_string):
    for root, dirs, files in os.walk(directory):
        for file in files:
            file_path = os.path.join(root, file)
            with open(file_path, 'r') as f:
                lines = f.readlines()
            
            with open(file_path, 'w') as f:
                for line in lines:
                    new_line = line.replace(old_string, new_string)
                    f.write(new_line)

# 示例用法
directory = '/path/to/directory'  # 替换为目标目录的路径
old_string = 'old_string'  # 替换为需要更改的字符串
new_string = 'new_string'  # 替换为新的字符串

replace_string_in_files(directory, old_string, new_string)