WEBVTT 00:01.200 --> 00:09.870 Hello, everyone, in this session, we will be talking about object oriented programming, so like 00:09.910 --> 00:17.610 other general purpose programming languages, Python is also an object oriented language and it has 00:17.610 --> 00:21.630 been an object object oriented language since its very beginning. 00:22.500 --> 00:28.110 Now it allows us to develop applications using an object oriented approach. 00:28.300 --> 00:30.570 So there are different types of approach. 00:30.590 --> 00:37.980 Overlimit one is object oriented approach and the second approach which we usually have in the programming 00:37.980 --> 00:41.190 languages, is in procedural approach. 00:41.570 --> 00:48.000 OK, so we need to first of all understand what is the difference between object oriented programming 00:48.240 --> 00:50.740 and the procedural programming. 00:51.900 --> 00:59.810 OK, so the object oriented programming is the problem solving approach here. 00:59.860 --> 01:07.570 V you have to do certain computation and these computations are done using different objects. 01:08.610 --> 01:15.330 So when we are using object oriented programming, we are trying to solve a particular problem. 01:15.780 --> 01:23.010 But when we talk about procedural programming, so in case of procedural programming, we are just trying 01:23.010 --> 01:29.590 to follow certain list of procedures or list of instructions step by step. 01:30.180 --> 01:36.720 So let's say I want to find out an area of a circle or area of a triangle or I'm trying to bake a cake 01:37.080 --> 01:45.570 and let's say I'm trying to do certain computation, do something which does not require much complicated 01:45.570 --> 01:48.660 stuff, just steps to be performed. 01:48.990 --> 01:52.380 In that case, I can very well use procedural programming. 01:53.440 --> 02:00.280 But when the problems are a little complex in nature at that point of time, object oriented programming 02:00.280 --> 02:02.770 comes in very useful. 02:03.400 --> 02:10.240 So when we're using object oriented programming, it helps making the development and the maintenance 02:10.240 --> 02:17.380 also very easy to be done by in case of procedural programming, which is very difficult to maintain 02:17.380 --> 02:23.260 the code when the project becomes very lengthy because we don't have any differences that we can go 02:23.260 --> 02:30.490 back to the code and look, we have to read the entire board for that and we might miss out on some 02:30.490 --> 02:31.340 variables there. 02:32.020 --> 02:36.690 But in case of object oriented programming, things are a little more structured in nature. 02:37.090 --> 02:42.850 So it is a little easier to deal with the code, to deal with the larger code when we are talking with 02:42.850 --> 02:44.140 object oriented programming. 02:46.120 --> 02:50.300 Another thing is object oriented programming allows more security. 02:50.710 --> 02:57.370 It allows us to hide the code, which we don't want others to see, I'm sure only the part of the person 02:57.370 --> 02:58.240 has to deal with. 02:58.720 --> 03:00.760 So let's say it's just like a car. 03:00.790 --> 03:04.330 So if I have a car, I want someone to look at the steering wheel. 03:04.330 --> 03:10.720 Only I'm the I don't want someone to go into the mechanics of the good. 03:11.170 --> 03:13.570 I will be building the whole car. 03:13.570 --> 03:16.570 I will be having all the engines and everything. 03:16.900 --> 03:22.120 But the person who is driving the car will only have to worry about how the work with the steering, 03:22.120 --> 03:27.880 the how to work with the brakes and the accelerator, they don't have to worry much about the mechanics 03:27.880 --> 03:28.470 behind it. 03:28.810 --> 03:32.290 So the same thing would be possible to do object oriented programming. 03:32.290 --> 03:34.570 That is, I will be able to hide those things. 03:34.930 --> 03:45.910 I'm not important for the user and only those things that you needed by the user, by in case of the 03:45.910 --> 03:52.840 procedural language, it does not provide any proper V for the binding and the hiding the details. 03:52.840 --> 03:54.840 So it does a little less secure in nature. 03:56.110 --> 03:59.080 So without wasting any time. 04:00.610 --> 04:05.280 Let us go ahead with it now, let us see photo. 04:07.740 --> 04:10.920 So what do we have an object oriented programming. 04:11.850 --> 04:20.500 So in case of object oriented programming, we are designing the program using classes and objects. 04:21.330 --> 04:22.830 So what is a plus? 04:22.830 --> 04:27.560 A plus is nothing but a collection of objects. 04:28.800 --> 04:33.160 So it is a logical entity that has some specific attributes and methods. 04:33.390 --> 04:38.070 So a class will have certain attributes and certain methods. 04:38.100 --> 04:45.740 Now let's say I have a employee class so it will have certain attributes and methods or whatever that 04:45.750 --> 04:53.460 the employee will have salary, the employee will have an email and the employee will have a name. 04:53.610 --> 04:54.810 He will have an age. 04:54.810 --> 04:57.850 He will have some role assigned to him. 04:57.870 --> 05:00.110 So these are different attributes of the employee. 05:00.720 --> 05:03.780 That is some values which are associated with the employee. 05:04.710 --> 05:13.240 Now, the methods associated with the employee could be, let's say, work or a a board. 05:13.410 --> 05:18.910 So these are different methods, typists, certain operations which an employee can perform. 05:20.070 --> 05:29.310 So that is the difference between the attribute and method after that becomes an object. 05:30.300 --> 05:31.470 So what is an object? 05:31.680 --> 05:36.500 Object is an entity that has a stake and a behavior. 05:37.290 --> 05:40.490 So an object will have different state. 05:40.510 --> 05:48.060 So then object can be any of the a life entity, let's say mouse, keyboard, GOP bullpen, person, 05:48.710 --> 05:49.270 animal. 05:49.710 --> 05:55.230 All these could be different objects and their later behavior could be. 05:55.260 --> 05:58.580 So let's say we have an example of a person. 05:58.830 --> 06:07.230 So if I have a person object, so this person object will have different methods or different behavior, 06:07.530 --> 06:11.370 that is the person can while the person can build, the person can eat. 06:11.970 --> 06:15.960 And there would be different attributes associated with that person. 06:15.960 --> 06:18.880 That is the name, age, profession, all these things. 06:19.560 --> 06:25.620 Now the object oriented programming will allow us to group the related things. 06:26.020 --> 06:35.540 So if a person has a different set of tasks like walked out of it so I can group them together now and 06:35.550 --> 06:37.560 a person can have walk, talk, eat. 06:37.770 --> 06:42.170 When I talk about the surgeon, there will be something like perform a surgery. 06:42.390 --> 06:48.420 So this had this is a different kind of task to be performed while Ed will have a different task like 06:48.420 --> 06:53.370 speech so I can group different types of functions for different types of objects to get. 06:54.880 --> 07:02.200 Right, so let's say we have a person right now, this person, one can only eat fruit and this person 07:02.530 --> 07:04.040 can only eat vegetables. 07:04.600 --> 07:05.750 So now what will happen? 07:06.070 --> 07:06.460 The. 07:07.690 --> 07:15.250 It is common with them, both of the people can eat, but one person can eat only fruit and other person 07:15.250 --> 07:16.480 can only eat vegetables. 07:16.660 --> 07:21.660 So here we have different behaviors so we can group different behaviors. 07:21.670 --> 07:25.330 We can segregate those different behaviors in these scenarios. 07:26.650 --> 07:29.920 OK, so this is what allows us to do. 07:29.920 --> 07:35.770 It allows us to create different type of behaviors for different types of object. 07:36.100 --> 07:41.650 And it also allows to group different behaviors based on the properties of object oriented programming, 07:41.650 --> 07:44.610 which we will be learning about later. 07:47.150 --> 07:52.400 Now, why do we need object oriented programming here? 07:52.430 --> 07:59.670 We talked about abortion, we talked about the person object, and this person object has attributes 07:59.690 --> 08:07.400 like name, age, profession, and this person can perform task that does have a method like walk, 08:07.400 --> 08:08.510 talk and eat. 08:10.040 --> 08:16.820 Now, let's see, I want to create different questions, I want to create one person to person, it 08:16.820 --> 08:17.630 will be easier. 08:17.630 --> 08:21.770 I can create one function and the person can perform that. 08:21.770 --> 08:22.970 It is easier to do. 08:23.160 --> 08:23.930 I can do that. 08:24.110 --> 08:27.830 I will need some variables to hold the values. 08:27.830 --> 08:29.960 And I will I can easily afford that. 08:30.350 --> 08:37.930 But let's say I will have to create a thousand person or let's say I have to create that person object 08:37.940 --> 08:40.340 or let's say ten thousand people. 08:41.210 --> 08:50.690 Then in that case I cannot create thousand variables and also keep track of those thousand variables. 08:51.440 --> 08:51.660 Right. 08:51.890 --> 08:57.080 And again, those thousand variables are only in case we have just one variable per person. 08:57.620 --> 09:02.660 But when this person has, let's say, instead of just three and four words, let's say this person 09:02.660 --> 09:06.680 has endless telephone number, I'm different other value. 09:07.010 --> 09:11.750 Let's add five hundred different values and I have ten thousand people. 09:12.020 --> 09:16.640 That makes it more than 50 million values. 09:17.430 --> 09:17.850 Right. 09:17.870 --> 09:25.010 I cannot create 50 million variables because that will actually overburden my entire program and the 09:25.010 --> 09:26.510 program will actually crash. 09:27.200 --> 09:28.630 I cannot have such a thing. 09:29.780 --> 09:33.440 This is where object oriented programming comes into picture. 09:34.280 --> 09:45.440 So object oriented programming will help me create a structured way to actually keep track of my variables 09:45.650 --> 09:50.480 and make things a lot more simpler to implement. 09:52.110 --> 09:55.670 So this is where object oriented programming will come into venture. 09:56.670 --> 10:04.590 Now, the next thing which we will be discussing is the implementation of object oriented programming 10:04.590 --> 10:05.650 and how we will do that. 10:05.970 --> 10:09.870 So let's do that in the next session. 10:10.200 --> 10:10.560 Thank.