handy.py

from os import name, system

def question(prompt, type_, predicate=None):
    while True:
        answer = input(prompt)
        try:
            thing = type_(answer)
            if predicate is None or predicate(thing):
                return thing
            else:
                print('invalid:', thing)
        except ValueError:
            print('unable to convert {!r} to {}'.format(answer, type_))

def clear():
	if name = 'nt':
		system('cls')
	else:
		system('clear')