练习 10.14：验证⽤户 最后⼀个 remember_me.py 版本假设⽤户要么 已输⼊其⽤户名，要么是⾸次运⾏该程序。我们应修改这个程序，以 防当前⽤户并⾮上次运⾏该程序的⽤户。
要求
为此，在 greet_user() 中打印欢迎⽤户回来的消息之前，询问他⽤户名是否是对的。如果不对，就调⽤ get_new_username() 让⽤户输⼊正确的⽤户名。
代码
from pathlib import Path
import json
def get_stored_username(path):
"""如果存储了⽤户名，就获取它"""
if path.exists():
contents = path.read_text()
username = json.loads(contents)
return username['username']
else:
return None
def get_new_username(path):
"""获取用户名以判断是否相符"""
username = input("What is your name?: ")
return username
def get_new_user_info(path):
"""提⽰⽤户输⼊用户信息"""
user_info = {}
username = input("What is your name?: ")
user_info['username'] = username
age = input("How old are you?: ")
user_info['age'] = age
fav_food = input("What food you like?: ")
user_info['favorite food'] = fav_food
contents = json.dumps(user_info)
path.write_text(contents)
return username
def greet_user():
"""问候⽤户，并指出其名字"""
path = Path('username.json')
new_name = get_new_username(path)
username = get_stored_username(path)
if new_name == username:
print("it's right")
if username:
print(f"Welcome back, {username}!")
else:
username = get_new_user_info(path)
print(f"We'll remember you when you come back, {username}!")
else:
print("username is wrong")
greet_user()
def get_info():
"""获取用户信息"""
path = Path('username.json')
contents = path.read_text()
infos = json.loads(contents)
for key, value in infos.items():
print(f"{key}:{value}")
return infos
def judgment_user(path):
"""判断用户是谁"""
path = Path('username.json')
username = get_stored_username(path)
greet_user()
get_info()
打印
