DATA ABSTRCATION:
=================

x-app:
	functionality-1:
		data
		methods	==> hide
		implementation ==> 

	functionality-2:
		data
		methods
		implementation
	
	functionality-3:
		data
		methods
		implementation

phonepe
	check balance
		implementation

	money transfer
		mobile
			data
			method
			implementation
		upi
		account


TV
	==> Remote controller
		channel up/down
		volume up/down
		turnoff
		turn on

==> The Data or methods in a class, we can give permission to access if required. We can hide if not necessary. This operation is called as "Data Abstraction".

Why?
===
1) For security
2) Reusability is increased.


Class is instantiated.

class ClassName:
	data
	method

obj = ClassName()
obj.data
obj.method

Abstract class:
	the class cannot be instantiated.
		but meant to be inherited.

from abc import ABC, abstractmethod


class abstractClass(ABC):
    @abstractmethod
    def myMethod(self):
        pass


"""
to add an abstract method inside the abstract class,
there is an annotation/decorator "@abstractmethod"
"""

obj = abstractClass()

obj.myMethod()

from abc import ABC, abstractmethod


class Parent(ABC):
    # instance method
    def met1(self):
        print("This is the common method of the class 'Parent'")

    @abstractmethod
    def met2(self):
        print("Hello")

class Child1(Parent):
    def met2(self):
        print("The Abstract method of Parent Class is defined in Child1 class.")

class Child2(Parent):
    def met2(self):
        print("The Abstract method of Parent Class is defined in Child2 class.")

# obj1 = Parent()
#
# obj1.met1()

obj1 = Child1()
obj1.met2()

obj2 = Child2()
obj2.met2()

================================

from abc import ABC, abstractmethod


class Greetings(ABC):
    def general(self,name):
        print("Hi",name)

    @abstractmethod
    def wishes(self):
        print("Welcome")

class timeZone1(Greetings):
    def wishes(self):
        print("Good Morning.")

class timeZone2(Greetings):
    def wishes(self):
        print("Good Afternoon.")

class timeZone3(Greetings):
    def wishes(self):
        print("Good Evening.")

# abstract classes are not instantiated

# tz1 = timeZone1()
#
# tz1.general("Ravi")
# tz1.wishes()

# tz2 = timeZone2()
# tz2.general("Kumar")
# tz2.wishes()

tz3 = timeZone3()

tz3.general("Ashwini")
tz3.wishes()