How to limit the type of characters input python

Question

How can I limit the number of characters and type of characters that can be inputted.

s = input('What is your number)

a number can only be 9 digits so it should be limited to 9 digits and only numbers

x = input('what is your email address)

an email address can contain a minimum of 8 characters and a maximum of 60 characters and also must contain an @ symbol.

How would I go about doing this?

You can not limit the input while the user is typing. You will have to take the input, check it and reprompt if it fails the check. — Klaus D.
– Klaus D., Commented Nov 20, 2018 at 3:46
And how about the number the type of characters? Also, when I get the length what do I do with it? — Call More
– Call More, Commented Nov 20, 2018 at 3:49
How to do it? You will have to write code. Tell us if you get stuck! — Klaus D.
– Klaus D., Commented Nov 20, 2018 at 3:51

Mark White · Accepted Answer · 2018-11-20 05:16:01Z

2

In fact, my dear friend, you cannot limit input function, but you can achieve what you want by this way:

def isnumber(s):
    if s.isdigit() and len(s) <= 9:
        return True
    else:
        print('you should input number and length less than 9')
        return False

def main():
    s = input('What is your number')
    while not isnumber(s):
        s = input('What is your number')
    print("your number is", s)


if __name__ == "__main__":
    main()

answered Nov 20, 2018 at 5:16

Mark White

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