Python - 以递归方式查找和替换文本文件中的字符串的方法

import os

def replace_string_in_file(file_path, old_str, new_str):
    with open(file_path, 'r') as file:
        file_data = file.read()

    file_data = file_data.replace(old_str, new_str)

    with open(file_path, 'w') as file:
        file.write(file_data)

def replace_string_in_directory(directory_path, old_str, new_str):
    for root, dirs, files in os.walk(directory_path):
        for file in files:
            if file.endswith('.txt'):
                file_path = os.path.join(root, file)
                replace_string_in_file(file_path, old_str, new_str)

        for dir in dirs:
            dir_path = os.path.join(root, dir)
            replace_string_in_directory(dir_path, old_str, new_str)

if __name__ == '__main__':
    directory_path = 'path/to/directory'
    old_str = 'old_string'
    new_str = 'new_string'
    replace_string_in_directory(directory_path, old_str, new_str)