Question

我正在自学python，遇到了一个我似乎找不到解决方法的问题。我创建了一段代码，将输入的密码与数据库中存储的密码进行比较。我的代码应该有两种可能。

1）如果密码正确。提示用户输入新密码，然后必须再次出现输入密码的提示（这次接受新密码）。

2）如果密码不正确，将提示用户输入密码，直到输入正确的密码为止。

在VBS中，我曾经能够使用GOTO命令。我不确定是否可以在Python中使用它，是否可以避免使用它，因为它会使程序难以遵循。

password = "@123"
entry = input("Please Input The Password:")

if (password == entry):
    entry = input("Password correct you may enter a new password.")
else:
    entry = input("Password Incorrect, Try again.")

Answer 1

有多种方法可以完成此操作。这是使用while循环和break语句实现此目标的简单方法。

["en-US", "en"]

希望有帮助。

Answer 2

while password != entry: # Executes until (password == entry), and does not execute if it is met, even for the first time.
    print('Sorry, wrong password.')
    entry = input('Enter password >') # or other source of data
print('Correct!')

编辑：执行此操作的其他方法：

while True: # forever loop, but
    entry = input('Enter password >') # or other source of data
    if password == entry:
        print('Correct!') # you can also put this outside of the loop
        break # exit the loop no matter what
        # do not put code after the break statement, it will not run!
    print('Sorry, wrong password') # will execute only if password != entry, break ignores the rest of the code in the loop

Answer 3

最容易用while语句创建函数。

password = "@123"
def login():
    while True:
        answer = input("Please Input The Password:")
        if answer == password:
            print("Password correct you may enter a new password.")
        else:
            print("Password Incorrect, Try again.")
            break
login()

如何避免循环回代码行？

3 个答案: