def greetuser(): username = getstoredname() if username and input("Is that your name: " + username + " (y/n)")=="y": print("Welcome back, " + username + "!") else: username = getnewname() print ("We'll remember you when you come back, " + username + "!")

我回答过的问题: Python-QA

import json
'''
如果以前存储了用户名，就加载它,并询问是否为该用户的用户名，否则，
就提示用户输入用户名并存储它 。
'''
filename = 'username.json'
try:

with open(filename) as f_obj: username = json.load(f_obj) if input('Is that your name: ' + username +'?' + ' (y/n) \n')=='y': print("Welcom back,%s!" %username) else: username = input('What is your name?\n') with open(filename,'w') as f_obj: json.dump(username,f_obj) print("We'll remember you when you come back,%s!" % username)

except FileNotFoundError:

username = input('What is your name?\n') with open(filename,'w') as f_obj: json.dump(username,f_obj) print("We'll remember you when you come back,%s!" % username)