Python Design Patterns: Object-Oriented Design

The object-oriented design pattern is the most commonly used design pattern. This pattern can be found in almost every programming language.

How to Implement the Object-Oriented Design Pattern

Now let’s look at how to implement the object-oriented design pattern.

class Parrot:
   # class attribute
   species = "bird"

   # instance attribute
   def __init__(self, name, age):
      self.name = name
      self.age = age

# instantiate the Parrot class
blu = Parrot("Blu", 10)
woo = Parrot("Woo", 15)

# access the class attributes
print("Blu is a {}".format(blu.__class__.species))
print("Woo is also a {}".format(woo.__class__.species))

# access the instance attributes
print("{} is {} years old".format( blu.name, blu.age))
print("{} is {} years old".format( woo.name, woo.age))

Output

The above program produces the following output

Explanation

This code includes both class attributes and instance attributes, which are printed according to the output requirements. Various features form part of the object-oriented pattern. These features will be explained in the next chapter.