Python一直提示直到有效

Question

我正在编写一个提示输入用户名的脚本。用户名的长度必须是 3 个或更多且 10 个或更少的字符。我想使用 while 重构代码，而不是重复提示。def hint_username(username):    if len(username) < 3:        print("Invalid Username, minimum of 3 characters")        myUser = input("Please enter username: ")        hint_username(myUser)    elif len(username) >10:        print("Invalid Username, maximum of 10 characters")        myUser = input("Please enter username: ")        hint_username(myUser)    else:        print("Valid Username")myUser = input("Please enter username: ")hint_username(myUser)

Answer 1

while您可以使用循环来执行此操作。我不建议递归调用函数来验证用户输入。

def invalid_username(username):

    return not 3 <= len(username) <= 10

myUser = input("Please enter username: ")

while invalid_username(myUser):

    myUser = input(

        "Invalid username! Username must be 3 to 10 characters.\n"

        "Please enter username: "

    )

print("Valid Username")

Python 导师中的示例代码