## Code

Methods inside the class:
  - `say_meow`;
  - `set_name` with the `name` argument . 


`set_name` defines an **additional** attribute `name` and sets the value of the given statement. 
`self` means that this variable is the class attribute, not the local variable.

Object `cat` is created.
We call `say_meow` method and change the attribute of the class by referring to `cat.hair_color`. 
We set `'Princess'` as the name using `set_name` method.

class Cat:
  def say_meow(self): 
    print('Meow')
  def set_name(self, name):
    self.name = name
    print(self.hair_color, 'cat name is', self.name)
  
# Instantiating an object
cat = Cat()
cat.say_meow()
# Creating the unique сat
cat.hair_color = 'White'
cat.set_name('Princess')

The first step is to understand the key statements. Classes, objects, attributes, methods...

Encapsulation provides access to the methods and attributes of the class.

Inheritance's main idea is to use already defined classes and produce new ones by improving and extending some other classes.

This OOP principle allows the user to change the parent class functionality and adapt it to the children's class.