class Fruit:
    """
    A simple representation of a fruit

    Attributes
    ----------
    name : (str) the name of the fruit
    color: (str) the color of the fruit
    eaten: (bool) whether the fruit has been eaten
    age: (int) how many days old the fruit is

    Methods
    -------
    is_eaten(): (bool) returns whether the fruit has been eaten
    eat(): (None) "eats" the fruit
    allergy_check(allergic_color): (bool) checks whether the allergic_color matches the color of the fruit
    age_fruit(): (None) ages the fruit by one day
    """

    def __init__(self, name, color):
        self.name = name
        self.color = color
        self.eaten = False
        self.age = 0

    def is_eaten(self):
        """
        returns whether the fruit has been eaten
        :return: (bool) whether the fruit has been eaten
        """
        return self.eaten

    def eat(self):
        """
        "eats" the fruit
        :return: (None)
        """
        self.eaten = True

    def allergy_check(self, allergic_color):
        """
        checks whether the allergic_color matches the color of the fruit
        :param allergic_color: (str) the allergic color to compare the color of the fruit to
        :return:
        """
        return self.color == allergic_color

    def age_fruit(self):
        """
        ages the fruit by one day
        :return: (None)
        """
        self.age += 1

    def __str__(self):
        return self.color + " " + self.name + " that is " + \
               str(self.age) + " days old"


def main():
    fruit = Fruit("banana", "yellow")
    print(fruit)
    print(fruit.allergy_check("red"))
    fruit.age_fruit()
    print(fruit)
    print(fruit.is_eaten())
    fruit.eat()
    print(fruit.is_eaten())

if __name__ == "__main__":
    main()