有没有办法在while循环中简化isalpha，len函数？

Question

我是一个非常新的程序员。刚从 Python 开始。本质上，我必须编写一个程序来接受用户名输入，并进行一些验证。用户名必须介于 5-10 个字母字符之间。我得到代码来测试字符串的长度，但我没有得到它来测试字母字符。我做错了什么？

correct = True
while correct:
    username = input('Enter a username that has only alphabetical characters and is between 5 and 10 characters long:')
    if username.isalpha:
        while len(username) < 5:
            print('Invalid username! Please try again.')
            username = input('Enter a username that has only alphabetical characters' +
                             ' and is between 5 and 10 characters long:')
        if username.isalpha:
            while len(username) > 10:
                print('Invalid username! Please try again.')
                username = input('Enter a username that has only alphabetical characters' +
                                 ' and is between 5 and 10 characters long:')
            correct = False
else:
    print('Username accepted.')

Answer 1

isalpha 是一个函数，顺便说一句，你需要调用它所以 isalpha() 而不是

如果你想了解更多关于python字符串https://docs.python.org/3/library/string.html，我建议阅读官方python文档以便更好地学习

Answer 2

正如评论区所说，你漏掉了isalpha的括号()。
我还建议像这样编辑代码：

while True:
    username = input('Enter a username that has only alphabetical characters and is between 5 and 10 characters long:')
    if username.isalpha() and 5 <= len(username) <= 10:
        print('Username accepted.')
        break
    else:
        print('Invalid username! Please try again.')

有没有办法在while循环中简化isalpha，len函数？

Is there a way to simplify isalpha, len function, in a while loop?

python

validation

loops

function

isalpha