Question

在下面提到的代码中我添加了user_input.lower（）但是，这段代码没有给出输入的预期输出为W，M或S，有人可以解释我为什么，我在python中错误地使用字符串方法？

# Password Generator
import random
import string

print('----------------PASSWORD GENERATOR-------------------')

print('''We will help you to generate 3 types of passwords
1. Weak passwords : It will consist 4 alphabets.
2. Moderate passwords: It will consist 7 alphanumeric characters.
3. Strong Passwords : It will consist 10 alphanumeric and symbol     
characters.''')


while True:
        user_input = input('''
    What type of password you need?
    Enter "W" for weak password
    Enter "M" for moderate password
    Enter "S" for strong password\n''')

    # To reduce chances of error if user gives command in upper or lower case.
       user_input.lower()


        if user_input is 'w':
            alphabet = string.ascii_letters # string.digits + string.punctuation
            password = ''.join(random.choice(alphabet) for i in range(4))
            print(password)
            break

        elif user_input is 'm':
            alphabet = string.ascii_letters + string.digits # string.punctuation
            password = ''.join(random.choice(alphabet) for i in range(7))
            print(password)
            break

        elif user_input is 's':
            alphabet = string.ascii_letters + string.digits + string.punctuation
            password = ''.join(random.choice(alphabet) for i in range(10))
            print(password)
            break

        else:
            print('Please enter a valid choice')

Answer 1

这是因为当你使用“.lower（）”时，实际上并没有将输出保存到变量中。因此，要将其保存在变量中，您必须执行“user_input = user_input.lower（）”。

如何在python中应用String方法的概念？

1 个答案: