Question

所以我有一个学校项目的代码（它解释了变量名称），但是当我到达底部的for循环时，它表示列表索引超出了范围。它应该输入用户名，然后在要求输入密码之前检查它。我试图弄清楚什么是错的，但没有任何作用。

def passwordSystem():
    #TASK ONE
    username_array = []
    password_array = []
    for i in range (1, 30):
        username_to_be_entered = str(input("Enter a username"))
        acceptable_password = False
        while not acceptable_password:
            password_to_be_entered = str(input("Enter a password between 6 and 12 characters"))
            if len(password_to_be_entered) > 12 or len(password_to_be_entered) < 6:
                print ("Your password was not between 6 and 12 characters")
            else:
                acceptable_password = True
                print ("Password accepted")
        print ("Your username is:" ,username_to_be_entered)
        print ("Your password is:" ,password_to_be_entered)
    #TASK TWO
    username_accepted = False
    while not username_accepted:
        username_to_be_checked = str(input("Please enter your username"))
        for i in range (1, 30):
            if username_array[i] == username_to_be_checked:
                print ("Username accepted")
                username_accepted = True

Answer 1

你的名单永远是空的。在此代码块中，您需要将用户名和密码附加到各自的列表中。

while not acceptable_password:
    password_to_be_entered = str(input("Enter a password between 6 and 12 characters"))
    if len(password_to_be_entered) > 12 or len(password_to_be_entered) < 6:
        print ("Your password was not between 6 and 12 characters")
    else:
        acceptable_password = True
        username_array.append(username_to_be_entered)
        password_array.append(password_to_be_entered)
        print ("Password accepted")

然后，要检查用户名，您应该使用in关键字，而不是手动迭代整个列表。

#TASK TWO
username_accepted = False
while not username_accepted:
    username_to_be_checked = str(input("Please enter your username"))
    if username_to_be_checked in username_array:
        print ("Username accepted")
        username_accepted = True

不理解for循环

1 个答案: