38讲习题动动手0改进
user = input("请输入用户名：")password = input("请输入密码：")
initialuserpassword = {"小甲鱼":"I_love_FishC","不二如是":"FishC5201314"}
while user in initialuserpassword:
user = input("请重新输入用户名：")
initialuserpassword = password
break
print("目前已注册的用户名是：",initialuserpassword)
又改进了一下，不知道还有什么地方不妥
密码应该放在输入用户名之后，break 多加了，去掉。最后只打印一个人账户了，应该打印整个字典的账户 加个 for 循环。
另外你自己注册的账户只有在错误时添加到字典，而若没输入错误就没天骄到字典了
应该将字典赋值放置 while 循环外部，参考代码：
user = input("请输入用户名：")
initialuserpassword = {"小甲鱼":"I_love_FishC","不二如是":"FishC5201314"}
while user in initialuserpassword:
user = input("请重新输入用户名：")
password = input("请输入密码：")
initialuserpassword = password
print("目前已注册的用户名是：")
for i in initialuserpassword:
print(i)
user = input("请输入用户名：")
initialuserpassword = {"小甲鱼":"I_love_FishC","不二如是":"FishC5201314"}
while user in initialuserpassword:
print("改用户名已被注册！！！")
user = input("请重新输入用户名：")
password = input("请输入密码：")
initialuserpassword = password
print("-------------\n目前已注册的用户名是：")
for each in initialuserpassword:
print(each)
改过的，哈哈
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