Python 用户名存储示例：使用 JSON 文件

import json

filename = 'username.json'

try: with open(filename) as f: username = json.load(f) except FileNotFoundError: username = input('What is your name? ') with open(filename, 'w') as f: json.dump(username, f) print(f'We'll remember you when you come back, {username}!') else: print(f'Welcome back, {username}!')