Object Oriented programming Python , Examples

Destructer

## Destructer delete object by itself when its reference is 0
from abc import ABC, ABCMeta, abstractclassmethod

'''
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared,
 but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide 
 implementations for the abstract methods.
'''


# Class That can't be instantiated
class AbstractClassDemo(ABC):

    @abstractclassmethod
    def skills(self):
        print('Hello')


#abs = AbstractClassDemo()
## It though error as Abstract class can't be instantiated

class Base(AbstractClassDemo):
    def __init__(self):
        self.name = 'Sudhanshu Patel'
    def skills(self):
        print('I am in Base Class')

    def __del__(self):
        class_name = self.__class__.__name__
        print( class_name, 'Destroyed Successfully')


obj =  Base()
obj.skills()

MutipleInheritance.py

# Priority in Multiple Inheritance
# Skills function call is based on priority that is decided by order in which class is inherited
class Father:
    def skills(self):
        print('Programming, Movies')


class Mother:
    def skills(self):
        print('Cooking, Dance ')


class Child1(Mother, Father):
    # Order of inheritance provide priority in case of ambiguity
    pass


class Child2(Father, Mother):
    pass

print('\nSkilles of child 1___')
c1 = Child1()
c1.skills()
#print : Cooking, Dance

print('\n\nSkilles of child 2___')
c2 = Child2()
c2.skills()
#print : Programming, Movies

MutipleInheritance_1.py

class Father:
    def skills(self):
        print('Programming, Movies')


class Mother:
    def skills(self):
        print('Cooking, Dance ')


class Child1(Mother, Father):
    def skills(self):
        super().skills()
        # It calls skill function from mother class as mother is on priority
        # If not found then lookup for Father class

        # To explicitly call skill from father class we can use like this
        Father.skills(self)
        print('Sports, Technology')


print('\nSkilles of child ___')
c1 = Child1()
c1.skills()

print('__**Explicitly when we want to call skill function from Father class when skill function overriden in child**__')
Father.skills(c1)