Python OOP

python object oriented programming

python OOP

In this article

• class
• object
• dot operator
• self parameter
• constructor
• Inheritance
• super function

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Python is one of the object oriented programming language. Class are created method and properties. if we create class, we can use more than once that class with creating object.

Class ( class classname: )

Teacher class

class Teacher:
    pass

Object ( object = class( ) )

Creating an object named Emma

class Teacher:
    pass

emma = Teacher()

In a class, we can add properties and methods.

class Teacher:
    #property
    subject = "Math"

    #method
    def teach(self):
        return f"teaching {self.subject}"

emma = Teacher()
print(emma.subject)
print(emma.teach())

f String (f “ string” )

dot Operator

Object connects with its own properties and methods by dot operator.(emma.subject)

self parameter

parameter self means its own properties. ( def teach(self) )

Constructor ( def __init__(self) )

def __init__(self) is constructor function. constructor function give you starting values after you create an object. In python, constructor is used to initialize object values. And that function is called automatically after you created an object.

class Teacher:
    def __init__(self):
        print("this is constructor function")

    def teach(self):
        return f"teaching"

# at the same time you create an object, constructor is called
emma = Teacher()

And it is used to assign values

class Teacher:
    def __init__(self, subject):
        self.subject = subject

    def teach(self):
        return f"teaching {self.subject}"


emma = Teacher("Math")
print(emma.teach())

Inheritance

Child class inherits from Parent class

class Parent:
    def __init__(self):
        self.eye_color = "black"

class Child(Parent):
    pass

sophia = Child()
print(sophia.eye_color)

class Parent:
    def __init__(self, hair_color):
        self.hair_color = hair_color
        self.eye_color = "gray"

class Child(Parent):
    def __init__(self, hair_color):
        super().__init__(hair_color)
        self.age:int

    def get_all(self):
        print(f"hair color is {self.hair_color}")
        print(f"eye color is {self.eye_color}")
        print(f"age is {self.age}")

sophia = Child("black")
sophia.age = 12
sophia.get_all()

Super Function ( super( ) )

super function return parent class

super().__init__()

Class B inheritance from Class A

class a():
    def __init__(self):
        self.num = 3
        self.total = 10


class b(a):
    def __init__(self):
        self.shape = 'circle'

object_b = b()
print(object_b.num)

Result

Class B inheritance from Class A and create own shape value

class a():
    def __init__(self):
        self.num = 3
        self.total = 10


class b(a):
    def __init__(self):
        super().__init__()
        self.shape = 'circle'

object_b = b()
print(object_b.num)

Result