在第一行插入字符串使用python3

Question

我要插入

# -*- coding: utf-8 -*-

到多路径（包括子目录和diff目录）中多文件的第一行当我使用open + whrite python代码时，结果将追加到底部

import os

def show_folder_content(folder_path):
    folder_content = os.listdir(folder_path)
    for item in folder_content:
        if os.path.isdir(folder_path + '\\' + item):
            print('folder：' + item)

            show_folder_content(folder_path + '\\' + item)
        elif os.path.isfile(folder_path + '\\' + item):
            print('file：' + item)
            f = open(folder_path + '\\' + item, "a")
            f.write("\n# -*- coding: utf-8 -*-")
            f.close()
        else:
            print('other：' + item)

target_folder = 'F:\\project\\test_source'
show_folder_content(target_folder)

如何附加所有文件的顶部（第一行），原因是'我想洗澡使我的代码支持utf8

Answer 1

import os

def show_folder_content(folder_path):
    folder_content = os.listdir(folder_path)
    for item in folder_content:
        if os.path.isdir(folder_path + '\\' + item):
            print('folder：' + item)

            show_folder_content(folder_path + '\\' + item)
        elif os.path.isfile(folder_path + '\\' + item):
            print('file：' + item)
            with open(folder_path + '\\' + item, "r+") as f:
                s = f.read(); f.seek(0); f.write("# -*- coding: utf-8 -*-\n" + s)

            # f = open(folder_path + '\\' + item, "a")
            # f.write("\n# -*- coding: utf-8 -*-")
            # f.close()
        else:
            print('other：' + item)


target_folder = 'F:\\project\\test_source'
show_folder_content(target_folder)