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Hello.

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Welcome to the session on.

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Object Oriented Programming.

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Object oriented programming is a programming style that is associated with the concept of class objects

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and various other concepts revolving around these two.

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There are three widely used programming styles.

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One is procedural programming.

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Functional programming and then Object Oriented Programming.

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Python supports all these three programming styles or approaches.

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We are interested to know about object oriented programming object oriented programming is an approach

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to programming that uses objects and their interactions to design applications and computer programs

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object oriented programming models real world things as software objects which have some data associated

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with them and can perform certain functions.

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For example an object could represent a human being with properties such as name age height weight address

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etc. and a human being can perform functions such as walk dog run sleep eat etc..

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Another example of an object is a car.

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A car can have properties like modern brand car load mileage year of manufacture etc. and some of the

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actions that can be performed on the card object.

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We can start the engine accelerate the car apply brakes and stop engine being rolled objects have a

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property also known as data odd state and they also can perform functions or behavior and the aim of

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object oriented programming is to imitate this.

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In terms of software so that objects in software have two entities attached to them the data and the

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function and object in programming that has two entities attached to it.

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One is the data and the other the things that act on this data also known as functions.

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The data are called the attributes of the object and the functions attached to the object which act

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on the data are called methods method of the object we've been working on a lot of Python objects in

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of course for example strings Python strings are objects.

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Say for example when we define a variable a in a sine the text like this.

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This means a is an object which is binding to this string.

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And now we can have methods that act upon this object.

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Say for example I'm going to call the method upper

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on this object and this is going to change the state all the data contained in this object

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similarly integer list flawed boolean are different Python objects so we have discussed that object

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oriented programming is associated with the concept of class and object so we know what an object is.

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We will talk about a class you can think of a class as an idea for how something should be defined.

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So it is something like blueprint for how something should be defined but it doesn't actually provide

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a neat ideal content itself.

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So here we have defined a class named God and this class gives us a structure to define various objects.

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So in this class we have defined some attribute for the object that can be associated with an object

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and yet we have a method that acts upon the object or the data and in a class both the data that is

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the attribute and the functions or methods that will be operating on this data are bundled as a unit.

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And when we define a class only the description for the object is defined.

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There is no object created yet so no memory or storage is allocated.

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Then the class is defined and when we define a function in Python we use the key word.

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Def D E F then we define a class we use the keyword class like this and then we add the name of the

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class beginning with a capital letter as soon as we define a class a new class object is created with

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the same name.

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And this class object allows us to access these different attributes as well as to create new objects

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of this class because a class acts like a blueprint we can use this blueprint Greek to create real objects

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of this class.

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So now let's see how we can create objects of D Class Carl.