如何让程序进入输入？

Question

编写一个程序，要求用户输入密码、名字、姓氏和 ID。如果其中任何一个无效，则程序会不断要求提供有效输入。规则如下：

• 密码必须至少为 7 个字符，必须包含至少一个大写字母、至少一个小写字母和至少 1 个数字
• 名字和姓氏只能包含字母
• ID 只能包含数字

在您输入所有内容后，将它们有效地打印在屏幕上。由于密码是敏感信息，只打印前三个字符，其余长度，打印'*'

password = 'Pass1234'
first_name = 'John'
last_name = 'Smith'
ID = '1234'
    
p = input('Input your password: ')
    
if (len(p)<6):
    print('Invalid password. Must be at least 6 characters')
    p = input('Input your password: ')

elif not p.islower():
    print('Invalid password. Must have at least 1 lowercase character')
elif not p.isupper():
    print('Invalid password. Must have at least 1 uppercase character')

if p == password:
    print('Well done! This is a valid password')

password_list = list(password)
password_list[3] = '*'
password_list[4] = '*'
password_list[5] = '*'
password_list[6] = '*'
password_list[7] = '*'
edited_password = ''.join(password_list)


fn = input('Please enter your first name: ')
ln = input('Please enter your last name: ')

for f in fn:
    if f.isdigit():
        print('Invalid Name! Name should only contain letters')
        fn = input('Please enter your first name: ')
for l in ln:
    if l.isdigit():
        print('Invalid Name! Name should only contain letters')
        ln = input('Please enter your last name: ')
if fn == first_name or 'john' and ln == last_name or 'smith':
    print('Well done! This is a valid name')


I = input('Please enter your ID: ')

if I.isupper():
    print('Invalid ID! ID should only contain numbers')
    I = input('Please enter your ID: ')
elif I.islower():
    print('Invalid ID! ID should only contain numbers')
    I = input('Please enter your ID: ')
elif I == ID:
    ('Well done! This is a valid ID')

print('Name:', first_name, last_name)
print('ID:', ID)
print('Password:', edited_password)

输出：

Input your password: Pass1234
Invalid password. Must have at least 1 lowercase character
Well done! This is a valid password
Please enter your first name: John
Please enter your last name: Smith
Well done! This is a valid name
Please enter your ID: 1234
Name: John Smith
ID: 1234
Password: Pas*****

如何修复我的程序不打印小写错误消息？

Answer 1

你可以做这样的事情。您遇到的问题是您正在检查您的整个密码是否为小写，而不是至少有 1 个字符。

当然，您可能希望将输入变量从“p”更改为“密码”，而不是在页面顶部对其进行硬编码。

p = input("Input your password: ")
upper = 0
lower = 0 
number = 0
while True:
    for x in p:
        if x.isupper()==True:
            upper+=1
        elif x.islower()==True:
            lower+=1
        elif x.isalpha()==False:
            number+=1
    if len(p) < 7 or upper <= 0 or lower <= 0 or number <= 0:
        print ('password not complex enough')
        p = input('please enter password again ')
        upper = 0
        lower = 0
        number = 0
    else:
        break