如何在Python中循环此登录？

如何循环登录，以便每当有人使用错误的用户名和密码登录时，程序将再次询问用户名和密码，直到正确为止

def login():
    global Account
    UserName_File = 'users.csv'
    Separation = ','

    print('Welcome to the eHealth program, please sign in')
    UserName = input('Fill in your username: ')
    Password = input('Fill in your password: ')
    File = open(UserName_File, 'r')

    Signedin = False
    while Signedin != True:
        Account = File.readline()
        Account = Account.split(Separation)
        Account[-1] = Account[-1].strip('\n')
        print(Account)
        if Account[0] == '': #If the .csv file is empty or when the username and password are wrong 
            print('Failed to sign in, please try again')
            File.close()
            return
        else:
            UserName_File = Account[0]
            Password_File = Account[1]
            User = Account[2] #Doctor or patient
            if UserName_File == UserName and Password_File == Password and User == 'patient':
                Signedin = True
                print('Succesfully logged in, welcome patient')
                File.close()
                return
                #start to run patient functions
            elif UserName_File == UserName and Password_File == Password and User == 'doctor':
                Signedin = True
                print('Succesfully logged in, welcome doctor')
                File.close()
                return
                #start to run doctor functions

Account = ''
login()
print(Account)

users.csv包含

username,password,function
patient,patient1,patient
doctor,doctor1,doctor
etc...

---

要使当前代码正常工作，只需将

input

部分移动到while循环中，然后删除

return

调用。固定代码：

def login():
    global Account
    UserName_File = 'users.csv'
    Separation = ','

    print('Welcome to the eHealth program, please sign in')

    Signedin = False

    while Signedin != True:

        UserName = input('Fill in your username: ')
        Password = input('Fill in your password: ')
        File = open(UserName_File, 'r')
        Account = File.readline()
        Account = Account.split(Separation)
        Account[-1] = Account[-1].strip('\n')
        print(Account)
        if Account[0] == '': #If the .csv file is empty or when the username and password are wrong 
            print('Failed to sign in, please try again')
            File.close()
        else:
            UserName_File = Account[0]
            Password_File = Account[1]
            User = Account[2] #Doctor or patient
            if UserName_File == UserName and Password_File == Password and User == 'patient':
                Signedin = True
                print('Succesfully logged in, welcome patient')
                File.close()
                #start to run patient functions
            elif UserName_File == UserName and Password_File == Password and User == 'doctor':
                Signedin = True
                print('Succesfully logged in, welcome doctor')
                File.close()
                #start to run doctor functions


Account = ''
login()
print(Account)

---

return

将始终退出正在执行的函数，而不是循环。

我希望这是学校作业或其他形式的玩具程序。在CSV文件中存储明文密码非常不安全。不幸的是，这将继续循环“登录失败，请重试”错误。@DamienBrils我在那里犯了很多愚蠢的错误，对不起。“我现在正在寻找一个合适的答案。”达米恩布里尔斯说，“我想现在应该可以了。”。对不起，我以前的回答很糟糕。