greedy.py

class things:
    def __init__(self, name, value, weight):
        self.name = name
        self.value = value
        self.weight = weight

    def __repr__(self):
        return f"{self.__class__.__name__}({self.name}, {self.value}, {self.weight})"

    def get_value(self):
        return self.value

    def get_name(self):
        return self.name

    def get_weight(self):
        return self.weight

    def value_Weight(self):
        return self.value / self.weight


def build_menu(name, value, weight):
    menu = []
    for i in range(len(value)):
        menu.append(things(name[i], value[i], weight[i]))
    return menu


def greedy(item, maxCost, keyFunc):
    itemsCopy = sorted(item, key=keyFunc, reverse=True)
    result = []
    totalValue, total_cost = 0.0, 0.0
    for i in range(len(itemsCopy)):
        if (total_cost + itemsCopy[i].get_weight()) <= maxCost:
            result.append(itemsCopy[i])
            total_cost += itemsCopy[i].get_weight()
            totalValue += itemsCopy[i].get_value()
    return (result, totalValue)


def test_greedy():
    """
    >>> food = ["Burger", "Pizza", "Coca Cola", "Rice",
    ...         "Sambhar", "Chicken", "Fries", "Milk"]
    >>> value = [80, 100, 60, 70, 50, 110, 90, 60]
    >>> weight = [40, 60, 40, 70, 100, 85, 55, 70]
    >>> foods = build_menu(food, value, weight)
    >>> foods  # doctest: +NORMALIZE_WHITESPACE
    [things(Burger, 80, 40), things(Pizza, 100, 60), things(Coca Cola, 60, 40),
     things(Rice, 70, 70), things(Sambhar, 50, 100), things(Chicken, 110, 85),
     things(Fries, 90, 55), things(Milk, 60, 70)]
    >>> greedy(foods, 500, things.get_value)  # doctest: +NORMALIZE_WHITESPACE
    ([things(Chicken, 110, 85), things(Pizza, 100, 60), things(Fries, 90, 55),
      things(Burger, 80, 40), things(Rice, 70, 70), things(Coca Cola, 60, 40),
      things(Milk, 60, 70)], 570.0)
    """


if __name__ == "__main__":
    import doctest

    doctest.testmod()