CracklePop.py

class CracklePop(object):
    def __init__(self, left, right):
        self.left = left
        self.right = right

    # Private methods
    def valid_bounds(self):
        left = self.left
        right = self.right

        return (isinstance(left, int) and isinstance(right, int) and
                left >= 0 and left <= right)

    def composed_msg(self):
        output_msg = ""
        for index in range(self.left, self.right + 1):
            output_msg += "\nValue for " + str(index) + " is: "
            if index % 3 == 0: output_msg += "Crackle"
            if index % 5 == 0: output_msg += "Pop"
        return output_msg

    # Public methods
    def get_crackepop_msg(self):
        if not self.valid_bounds():
            return 'Bad left and right bounds.'

        output_msg = self.composed_msg()
        return output_msg


test1 = CracklePop(1, 100)
print test1.get_crackepop_msg()