Adding objects

Modules -> OOP -> Methods -> Adding objects

Adding objects

Related code

class Dog:
    """Represents a dog.

    attributes: name: str, age: int, energy: int
    """

    def print(self):
        print(f'Name: {self.name}, Age: {self.age}')

    def set_info(self, name, age, energy):
        self.name = name
        self.age = age
        self.energy = energy

    def play(self, hours):
        self.energy -= hours * 10

    def sleep(self, hours):
        self.energy += hours * 10

    def is_older(self, other):
        return self.age > other.age

murki = Dog()
murki.set_info("Murki", 2, 50)

reksi = Dog()
reksi.set_info("Reksi", 1, 50)

When we compared two dogs, it was easier to find the way how to compare them. We named the method is_older and logically we had to compare their ages.

Now we want to add two dogs, and adding two dogs is not logical in daily life, but for some reason we need such functionality. For example:

We may want to create a dog which is as old as two dogs.
We may want to create a dog which has as much energy as two dogs.
Or we may want to create a dog which is as old and has as much energy as two dogs.

Let's go with the last one:

class Dog:
    ...
    def add(self, other):
        new_dog = Dog()
        new_dog.set_info(self.name + other.name, self.age + other.age, self.energy + other.energy)
        return new_dog
...

add takes two dogs, self and other, and returns a new dog that is as old as has as much energy as both of them, and the new dog's name is a combination of their names.

>>> sharki = murki.add(reksi, 'Sharki')
>>> sharki.print()
Name: MurkiReksi, Age: 3
>>> sharki.energy
100