High Level Programming languages
	three types:
		1) Structured : C, C++, Python
		2) Object Based : VB Script
		3) Object Oriented : C++, Python and Java

OOPs Concepts:
=============
Object Oriented Programming System
	1) Class
	2) Object
	3) Method
	4) Constructors
	5) Destructors
	6) Encapsulation
	7) Inheritance
	8) Polymorphism
	9) Overloading
	10) Overriding
	11) Abstraction etc. 

Class in Python:
================
Keyword: class

collection of attributes and behaviors.

Attributes ==> Data
Behaviors ==> Methods

Syntax:
	class class-name:
		code is for the 
		class implementation
		attributes
		methods

Class ==> Blueprint

no memory is required.

Object:
=======
==> physical entity
which we can use to access the data (members of the class).

create object:
==============
object-name = class-name()

To access the members of the class:
	object-name.member-name
# class with attributes
# the data or method in the class ==> member
#  can define with primitive types and also with collection type

class classWithPrimitives:
    a = 121
    b = 123.234e7
    c = 123-234j
    d = True
    e = "Python"

# print(a)
obj = classWithPrimitives

print(obj.a);print(obj.b);print(obj.c);print(obj.d);print(obj.e)
======================================

# Class with collection attributes

class classWithAttributes:
    ld = [1,2,3,4,5]
    td = 1,3,5,7,9
    sd = "Python"
    sed = {10,20,30,40,50}
    dd = {'a' : 11, 'b' : 111, 'c' : 1221}

obj = classWithAttributes()

print(obj.ld)
print(obj.td)
print(obj.sd)
print(obj.sed)
print(obj.dd)

obj.ld.append(100)
print(obj.ld)
=====================================
How to define the multiple objects for one class:
=================================================

# Class with collection attributes

class classWithAttributes:
    ld = [1,2,3,4,5]
    td = 1,3,5,7,9
    sd = "Python"
    sed = {10,20,30,40,50}
    dd = {'a' : 11, 'b' : 111, 'c' : 1221}

obj = classWithAttributes()
obj1 = classWithAttributes()
# obj2,obj3 = classWithAttributes()
obj2 = obj1
obj3 = obj

print(obj.ld)
print(obj.td)
print(obj.sd)
print(obj.sed)
print(obj.dd)

obj.ld.append(100)
print(obj.ld)

print(obj1.sed)
print(obj2.sd)

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

Class with methods:
===================

functions Vs Methods:
=====================
the named block in outside the class ==> function
the named block within the class ==> method

to access the function, we cannot require the object. But to access a method, we need an object.

self:
=====
==> is a keyword, which we can use to specify the method definition is belonging to the specific class.
==> self is acts as parameter without value assignment for the methods.

# Class with methods as members

class classWithMembers:
    def met1(self):
        print("Hi All.")

    def met2(self,name):
        print("Hello {},Good Evening.".format(name))

    def met3(self,a,b):
        return a+b

obj = classWithMembers()
# obj.met1('name')
obj.met1()
obj.met2("Xyz")
# print(obj.met3(100,200,250))
x = obj.met3(123,345)
print(x)