python library for user input

Question

I am implementing a small command line tool in python that needs to ask the user a couple of questions. I use

raw_input(\'Are you male or female?\')
<         


        

Answer 1

I don't know if such a library exists, but you could write an high-order function like this:

def check_input(predicate, msg, error_string="Illegal Input"):
    while True:
        result = input(msg).strip()
        if predicate(result):
            return result
        print(error_string)

result = check_input(lambda x: x in ['male', 'female'],
                                   'Are you male or female? ')
print(result)

Output:

Are you male or female? foo
Illegal Input
Are you male or female? bar
Illegal Input
Are you male or female? Male
Illegal Input
Are you male or female? male
male