no_teen_sum.py

# Given 3 int values, a b c, return their sum. However, if any of the values is a teen -- in the range 13..19 inclusive -- then that value counts as 0, except 15 and 16 do not count as a teens. Write a separate helper "def fix_teen(n):"that takes in an int value and returns that value fixed for the teen rule. In this way, you avoid repeating the teen code 3 times (i.e. "decomposition"). Define the helper below and at the same indent level as the main no_teen_sum().

def no_teen_sum(a, b, c):

    def teen_sum(n):
        return n if n not in [13,14,17,18,19] else 0

    return teen_sum(a) + teen_sum(b) + teen_sum(c)