Python:输入验证字符串长度 [英] Python: Input validate with string length

问题描述

好，所以我需要确保电话号码长度正确.我想到了这一点，但遇到语法错误.

Ok so i need to ensure that a phone number length is correct. I came up with this but get a syntax error.

phone = int(input("Please enter the customer's Phone Number."))
if len(str(phone)) == 11:
    else: phone = int(input("Please enter the customer's Phone Number."))
phonumber.append(phone)

推荐答案

您可以尝试使用它来询问电话号码，直到正确为止:

You may try this to be asking for the phone number until it is correct:

phone = ""
while len(str(phone)) != 11:
    phone = int(input("Please enter the customer's Phone Number."))
phonumber.append(phone)

如果您还想检查输入内容是数字而不是文本，那么在这种情况下，还应该捕获int引发的异常，例如:

If you want to check also that the input is a number and not text, you should also trap the exception raised by int in that case, for example:

phone = ""
while len(str(phone)) != 11:
    try:
        phone = int(input("Please enter the customer's Phone Number."))
    except ValueError:
        phone = ""
phonumber.append(phone)

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