Question

输入任何用户名和密码（不管是否正确）后，它会继续打印另一部分代码。

登录部分工作正常，但之后未显示正确的输出。它不断显示： “输入了错误的登录详细信息你有帐号吗？是或否”

这让我和我的老师都感到困惑。我用登录/注册系统的示例浏览了不同的网站。我也尝试过以不同的方式重新排列代码。

这是代码：

username = input("Please enter your username: ")
password = input("Please enter your password: ")
file = open("Usernames.txt","r")
found = False
for line in file:
    user = line.split(",")
    if user[0] == username and user[1] == password:
        found = True
        print("Username: " + user[0])
        print("~~~~~")
        print("Welcome to the game, " + user[0])
    else:
        found == False
        print("Incorrect login details entered")
        print("Have you made an account?")
        ans = input("Yes or No ")
        while ans not in ("Yes", "No"):
            if ans == "Yes":
                print ("Please sign in again")
                username = input("Please enter your correct username: ")
                password = input("Please enter your correct password: ")
            elif ans == "No":
                print("Would you like to make an account? ")
            else:
                ans = input("Please enter Yes or No ")

用户名和密码正确时的预期结果：

Username: Smartic
~~~~~
Welcome to the game, Smartic

用户名和密码不正确时的预期结果：

Incorrect login details entered
Have you made an account?
Yes or No

用户输入Yes时的预期结果：

Please sign in again
Please enter your correct username:
Please enter your correct password:

用户输入No时的预期结果：

Would you like to make an account?

用户输入Yes或No以外的内容时的预期结果：

Please enter Yes or No

Answer 1

无论输入什么用户名，都不能满足文件中的每个用户名。每次都没有，您的错误文本将被打印。按照this question中的说明重新设置代码格式。

Answer 2

更改您的：

while ans not in ("Yes", "No"):

在：

while True:

此外，我建议创建一个函数。

正如约翰·戈登（John Gordon）提到的使用中断，因此您的脚本将如下所示：

username = input("Please enter your username: ")
password = input("Please enter your password: ")
user = {0:'e',1:'w'}
found = False

if user[0] == username and user[1] == password:
    found = True
    print("Username: " + user[0])
    print("~~~~~")
    print("Welcome to the game, " + user[0])
else:
    found == False
    print("Incorrect login details entered")
    print("Have you made an account?")
    ans = input("Yes or No ")
    while True:
        if ans == "Yes":
            print ("Please sign in again")
            username = input("Please enter your correct username: ")
            password = input("Please enter your correct password: ")
            break
        elif ans == "No":
            print("Would you like to make an account? ")
            break
        else:
            ans = input("Please enter Yes or No ")
            break

Answer 3

文件中每一行的末尾都有一个新行。您可以使用strip（）函数删除换行符。

if user[0] == username and user[1].strip() == password:
    found = True
    print("Username: " + user[0])
    print("~~~~~")
    print("Welcome to the game, " + user[0])

我的代码会一直打印部分代码，而不是继续执行程序的其余部分

3 个答案: