Python Ninja Bootcamp 27-Inheritance

by SN Gurukul on November 20, 2018 in Basic Python

Learn Python like a Professional! Take You from 0 to Hero

In this Python lecture, we will learn about the Inheritance.

"Inheritance is the process of creating by using existing class".

The new class is called Derived / Sub / Child class.

The existing class is called Base / Super / Parent class.

Let's see the example of Inheritance-

class A:
    def __init__(self):
        print('Class A init method')

class B(A):
    pass

Here A is base class and B is the derived class. B inherits of all the feature of A

ob1 = B()

>> Class A init method

class A:
    def __init__(self):
        print('Class A init method')

class B(A):
    def __init__(self):
        print('Class B init method')

ob1 = B()

>> Class B init method

When object of derived class is created, it will first try to find the init method in derived class.
If not found, it will call the init method of base class

Now Super function is used to call the method of base class

class A:
    def __init__(self):
        print('Class A init method')

class B(A):
    def __init__(self):

        super().__init__()
        print('Class B init method')

ob1 = B()

>> Class A init method
Class B init method

Now let's create the display method base class A

class A:
    def __init__(self):
        print('Class A init method')
        
    def display(self):
        print('Class A display method')

class B(A):
    def __init__(self):
        super().__init__()
        print('Class B init method')

ob1 = B()

>> Class A init method
Class B init method

ob1.display()

>>Class A display method

Now let's create the display method for the derived class B

class A:
    def __init__(self):
        print('Class A init method')
        
    def display(self):
        print('Class A display method')

class B(A):
    def __init__(self):
        super().__init__()
        print('Class B init method') 
        
    def display(self):
        print('Class B display method')

ob1 = B()

>> Class A init method
Class B init method

ob1.display()

>>Class B display method

Now Use Super function to print the display method of base class A

class A:
    def __init__(self):
        print('Class A init method')
        
    def display(self):
        print('Class A display method')

class B(A):
    def __init__(self):
        super().__init__()
        print('Class B init method') 
        
    def display(self):

        super().display()
        print('Class B display method')

ob1 = B()

>> Class A init method
Class B init method

ob1.display()

>> Class A display method

Class B display method
Let's one more example of inheritance

class Student:
    
    def __init__(self,name,rollno,percentage):
        self.name= name
        self.rollno= rollno
        self.percentage= percentage
        
        
    def result(self):
        if self.percentage >30:
            print('Pass')
        else:
            print('fail')
            
class Branch(Student):
    
    def __init__(self,name,rollno,percentage,branch):
        super().__init__(name,rollno,percentage)
        self.branch = branch

ob2 = Branch('Tamta',1,90,'Cse')

print(ob2.name)
print(ob2.rollno)
print(ob2.percentage)
print(ob2.branch)

>> Tamta
1
90
Cse

ob2.result()

>> Pass

EDITS ARE WELCOMED!!

In the next Blog, we will discuss Q&A 4th

https://sngurukuls247.blogspot.com/2018/11/python-ninja-bootcamp-28-q-4th.html

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