WEBVTT 00:01.140 --> 00:11.070 In this session, people called for the concept, so let us first of all see what will happen if we 00:11.070 --> 00:13.290 don't have the concept. 00:14.010 --> 00:18.060 OK, so first of all, let's create something. 00:18.060 --> 00:25.850 So let's say I have a classroom and I want to have details of certain students with me. 00:26.370 --> 00:28.120 So let me create some students. 00:28.140 --> 00:31.390 So let us start with it. 00:31.710 --> 00:40.950 So my students are student one, which is. 00:45.540 --> 00:47.050 So here are my students. 00:47.080 --> 00:54.540 So the first student is Munsie, age twenty eight data scientist, the Nezha 20 developer, Kanika 38 00:54.540 --> 00:55.200 Consulting. 00:55.560 --> 01:02.640 So these are just three students that I have now for these three students if I have to bring them in. 01:03.150 --> 01:07.320 So what I can do is now here, if you see the data type, here is a list. 01:07.950 --> 01:15.440 So the information for my each student is stored in a list so I can access these name age Angledool 01:15.750 --> 01:17.280 using the indexes. 01:17.550 --> 01:18.650 So how would I do that? 01:18.660 --> 01:26.640 I can simply call it out and say your name is and then give the student name, student's identity and 01:26.640 --> 01:31.110 the index for that particular value, which I want to retrieve. 01:32.610 --> 01:35.440 So if I had done this, I can see that this is the name. 01:35.460 --> 01:36.000 This is the name. 01:36.580 --> 01:43.680 Now, if I will be doing that again and again, so I will have to create several students. 01:43.690 --> 01:46.550 So all these students will have some good were in 2003. 01:46.710 --> 01:51.150 So all these will be present and I will have led to ten thousand twenty thousand students. 01:51.390 --> 01:58.290 So I will need to have those 20000 variables which will hold all these values for me. 01:59.240 --> 02:02.630 Now let us try to create something. 02:02.640 --> 02:08.770 Let us try to retrieve these values and let us do that without object oriented programming. 02:09.060 --> 02:13.230 So how we do that is so. 02:18.210 --> 02:21.090 So let's create a function here. 02:21.240 --> 02:29.970 OK, so I'm created a function that says I'm defining the function, create the person I'm this great 02:29.970 --> 02:33.480 person will need an object. 02:33.570 --> 02:35.130 So some information. 02:35.160 --> 02:36.480 So what is this information? 02:36.480 --> 02:39.310 I want to get the information of some student. 02:39.510 --> 02:42.340 So let's say it will take some value. 02:42.400 --> 02:56.310 So let's say it will take a list of student and what will we do for the we need certain values associated. 02:56.340 --> 02:59.940 So let's create some global variables. 03:00.300 --> 03:03.090 Now, why am I creating global variables? 03:03.240 --> 03:11.250 Because if I will not create global variables, then whatever variable I will be creating in this particular 03:11.850 --> 03:15.730 function, the variables will not be accessible outside. 03:16.830 --> 03:20.790 So there will be no use of creating those variables. 03:21.330 --> 03:29.160 So what I can do is I will create some global variables, so say global, and I will say name, age 03:29.700 --> 03:30.300 and rule. 03:31.350 --> 03:38.930 Next, I'll say name is equal to say two then and the index one index. 03:39.990 --> 03:44.940 Similarly, I will have four age and rule. 03:58.910 --> 04:08.480 So I have these now, I will bring these values I see and I am printing name and ID, so I will say 04:09.180 --> 04:17.870 my name is this for my name and I'll see 04:20.010 --> 04:21.260 space. 04:24.620 --> 04:25.940 Age is. 04:31.940 --> 04:42.860 So this will bring water values for me now, I can simply create a person, so I think the person selling 04:44.180 --> 04:49.210 the person and I will put industry insiders, shouldn't one. 04:50.620 --> 04:58.680 So in this, I am putting the value for student once we get the list from here and I can see behind 05:00.380 --> 05:00.740 me. 05:01.300 --> 05:07.190 So if I read this, you can see this is getting the name out outside, although I can see the name here. 05:07.880 --> 05:16.520 Now, if I say print age, I can see that age also now four dead in the same cord. 05:16.520 --> 05:27.380 If I can create the person and get the name and age from student to, I guarantee, the respective name 05:27.380 --> 05:27.920 and age. 05:28.070 --> 05:30.690 So here I'm getting Munsie 28 and 20. 05:30.950 --> 05:36.550 So what happens here is that the labels which I have created are getting overwritten. 05:36.950 --> 05:44.690 So whatever information was saved in this name and age, the information will not carry forward in these 05:44.690 --> 05:49.150 two videos because it will be overridden by the information which is present in the student. 05:50.240 --> 05:56.120 Now, if I don't want to use the same video because I want to still want to keep these values, then 05:56.120 --> 06:01.100 I will have to create different variables or name one, age one. 06:01.490 --> 06:06.580 So in that case, I will be able to get these values again. 06:06.590 --> 06:08.720 So I will be able to retrieve these values again. 06:08.990 --> 06:14.990 So what will happen here is that I will have to create different variables and for different variables, 06:14.990 --> 06:23.900 I will have to see a and with those which will be a very keisters, I will not be able to actually find 06:23.900 --> 06:28.960 out which ones I'm using and to provide those is a very messy job. 06:28.970 --> 06:30.740 So it will be very difficult for us. 06:31.790 --> 06:35.820 So what we will be doing is now we will be using object oriented programming. 06:36.290 --> 06:37.410 So how do we do that? 06:37.440 --> 06:39.880 So I'll just report this. 06:42.920 --> 06:44.550 So now we will use objects. 06:44.990 --> 06:46.020 How would we do that? 06:46.400 --> 06:50.450 So we will see the DOPs. 06:51.650 --> 06:52.880 So what do we do here? 06:53.120 --> 06:56.360 So now we will be creating a class. 06:57.020 --> 07:02.360 Now there are different things which I will be using here and creating. 07:02.690 --> 07:04.820 You need not worry about the syntax. 07:04.820 --> 07:11.150 You need not worry about how I am writing the code as of now because we will be seeing that later. 07:11.480 --> 07:14.980 But right now you just need to get the infusion back. 07:15.410 --> 07:17.070 What am I trying to do? 07:17.090 --> 07:18.250 How I'm doing it. 07:18.270 --> 07:19.820 Well, how do we write that code? 07:19.820 --> 07:23.100 You need not worry about that right now because we will be doing that later. 07:24.140 --> 07:25.770 So let's go ahead with it. 07:26.090 --> 07:28.090 So first of all, I'm creating a class. 07:28.100 --> 07:30.260 How do we create a class B, C class? 07:31.400 --> 07:32.490 Give the class name. 07:32.680 --> 07:35.510 So my last name is say person. 07:36.590 --> 07:39.340 Person is my class name because it is a class name. 07:39.680 --> 07:46.340 It is said that you should give the first character as a captain. 07:47.570 --> 07:54.670 Now inside this I will see Self and I luzzi person. 07:55.010 --> 07:59.900 Now this person will for the information about the person I'm the self. 07:59.900 --> 08:03.140 You can for now consider this that this is a mandatory thing. 08:03.140 --> 08:07.610 When you are creating a class, you need to put in the same thing in it again. 08:08.180 --> 08:09.590 Just remember this thing. 08:09.710 --> 08:11.480 Just remember this as a syntax. 08:11.480 --> 08:14.510 You don't need to understand why am I doing this as of now. 08:14.780 --> 08:16.340 But we need to do that. 08:17.720 --> 08:24.800 What for now, when we create the function, then this is the class. 08:24.800 --> 08:30.100 In this class, I will have different functions and different attributes. 08:30.110 --> 08:33.380 What are those functions called now inside the class? 08:33.600 --> 08:40.940 When I'm declaring a function, when I'm writing a function inside of class, it is called a method. 08:41.630 --> 08:44.900 OK, so now we will not be writing functions. 08:45.110 --> 08:46.550 We are writing methods. 08:46.700 --> 08:50.960 So this is a different functions I what we are creating outside the classes. 08:50.960 --> 08:56.580 But when we create a function inside a class that is scholder method, let's go ahead. 08:56.930 --> 08:58.070 So how do we do that. 08:58.070 --> 09:02.690 We see then just how they have been creating functions ever since. 09:03.140 --> 09:05.960 So Dev and I say create person. 09:09.040 --> 09:10.150 Looks familiar. 09:12.220 --> 09:20.090 Let's go in person, I'm this great person needs what this creative person needs. 09:20.170 --> 09:22.570 Now, you need not for this here. 09:22.570 --> 09:25.630 As of now, this doesn't need to be here. 09:25.900 --> 09:26.800 It needs to be here. 09:27.610 --> 09:36.940 So we see self and we say, OK, so we are putting self inside this and the information about the person. 09:36.940 --> 09:49.330 And then we go ahead and then we put a little more information services self, not name, self age. 09:50.050 --> 09:52.680 So not really. 09:53.380 --> 09:58.890 Now we have saudade, name, age and now what are these name, General? 09:59.170 --> 10:04.150 These are the attributes of the class person. 10:04.360 --> 10:12.520 So this person will have some name, age and rule associated with himself or herself. 10:13.360 --> 10:20.230 Now, how do we how will we understand that this is something which is related to that person? 10:20.560 --> 10:23.850 And it is not a very it is not a common variable. 10:24.160 --> 10:25.390 It is not a common media. 10:25.400 --> 10:28.540 We would be use inside the code just like that. 10:28.540 --> 10:33.090 Maybe I want to keep account of people just let's see. 10:33.160 --> 10:34.690 I want to create account of people. 10:34.930 --> 10:40.950 So in that case, I might be having something will seek out and it will have led to somebody with maybe 10:42.070 --> 10:47.680 now each time that I create a person, this will increment the cup. 10:47.680 --> 10:59.040 So I'm just keeping track of the count so I can have something like GONGED is equal to count plus one. 10:59.230 --> 11:05.110 And what will happen this count is not something which is attached to this person. 11:05.980 --> 11:10.230 This account is a variable which is not related to this person. 11:10.240 --> 11:13.870 Plus, this is something which I have for myself or my entire board. 11:14.320 --> 11:15.490 It is something different. 11:15.680 --> 11:24.090 So this person has his own name, age, and why this count remains common to the entire. 11:24.370 --> 11:30.280 So no matter if I have been a thousand people in created using this class person, I will still have 11:30.460 --> 11:35.140 just one count really vital for each and every person. 11:35.140 --> 11:38.410 I will have a different name, different age, different role. 11:38.590 --> 11:44.740 Now, how will I find out which name, which age and which is all I am talking about, for which person 11:44.740 --> 11:45.580 I'm talking about. 11:46.060 --> 11:48.240 That is why we need this. 11:50.410 --> 11:58.750 When I say self-taught name, self-taught, self-taught person, that means that I am referring to the 11:58.750 --> 12:02.980 name age and the role of the person which I am creating. 12:04.120 --> 12:05.020 We'll see that. 12:05.350 --> 12:08.890 We'll have a look at how we do that. 12:08.950 --> 12:09.910 So let's go forward. 12:12.070 --> 12:16.060 This is the first one now for the let me bring something. 12:17.800 --> 12:25.660 So let me bring a little information so we see the person. 12:28.390 --> 12:36.730 What is the name of the person name now because I want to refer to the name of the person which I am 12:36.730 --> 12:37.330 creating. 12:37.330 --> 12:43.780 So I saved your name and I put. 12:51.440 --> 12:54.230 Has been created. 12:54.480 --> 13:04.610 OK, this is this now and created and let me add the candles out. 13:09.500 --> 13:15.070 So this is it will give me the count of the number and the other details accordingly. 13:17.070 --> 13:20.670 OK, now let's go ahead. 13:22.680 --> 13:31.400 So I have this and all these things now for the let me display the person, so I'll simply say death 13:32.730 --> 13:35.460 and similarly I create a function to bring this. 13:37.470 --> 13:39.850 So now we have this display person. 13:40.380 --> 13:41.580 Now, this will have what? 13:41.580 --> 13:43.200 This will have different being done. 13:43.500 --> 13:44.580 So how will we do that? 13:44.580 --> 13:54.120 We see the name of the person is self taught me and the age of the person is self-taught age and the 13:54.120 --> 13:56.650 profession of the person is self-taught. 13:56.670 --> 13:57.090 Really. 13:57.450 --> 13:59.490 OK, now we have these details. 13:59.880 --> 14:02.690 Now what we will do is now this is our class, OK? 14:03.000 --> 14:05.220 Now this class, what does this class do? 14:05.670 --> 14:11.710 This class will create a person and it will display the information regarding that person. 14:12.090 --> 14:14.180 Now they'll know nothing has been done. 14:14.280 --> 14:15.990 We have just created a layout. 14:16.440 --> 14:21.450 Now, when we create a class, when we write the class, we are just creating a template. 14:22.210 --> 14:27.180 OK, now how we use this template is using an object. 14:27.390 --> 14:28.570 Now, how will we do that? 14:28.770 --> 14:30.960 So now I'm creating a dummy object. 14:31.170 --> 14:33.430 OK, so let me create a dummy object. 14:33.450 --> 14:36.570 Now what will the what were the different people would be which we had. 14:36.960 --> 14:39.540 So we had this Monsey New High and Gannicus. 14:39.540 --> 14:41.770 So these were the three students which we had. 14:43.020 --> 14:46.770 So let's create an object for these. 14:46.980 --> 14:48.050 So what are the objects? 14:48.050 --> 14:49.170 So I create an object. 14:49.170 --> 14:55.110 Munsie I create this thing person. 14:56.250 --> 14:58.350 So now I have created an object. 14:58.740 --> 14:59.270 Munsie. 14:59.820 --> 15:07.250 OK, now I create another object Samiha and I create an object using person. 15:08.700 --> 15:14.760 Now every time I run this code, right, every time I done this, it creates an object. 15:15.420 --> 15:16.720 So we'll see how it is. 15:17.070 --> 15:25.310 So let's create the last one to connect the antipode person again. 15:25.950 --> 15:27.180 Now let me run this. 15:27.540 --> 15:29.340 OK, now I have done this. 15:29.590 --> 15:30.870 Now let's see further. 15:31.110 --> 15:41.930 OK, now when I see the type of marqusee it says mean person. 15:41.970 --> 15:45.010 So this says that this is a person, Manti's, a person. 15:45.360 --> 15:53.940 Let us see the type of person what this person person is they object to a person is basically a class. 15:54.530 --> 15:57.530 OK, now let us go for them now, Bill. 15:57.540 --> 15:59.820 No, it doesn't hold anything. 16:00.420 --> 16:02.820 Munsie has no values, OK? 16:02.820 --> 16:05.550 Munsie is just present then, but there are no values. 16:05.550 --> 16:06.210 Let us see. 16:06.210 --> 16:09.050 Munsie dot ne. 16:09.780 --> 16:17.250 So if I want to find out if I want to use particular values which are present in this class, I have 16:17.250 --> 16:19.450 to use a dot operator. 16:20.160 --> 16:23.370 OK, if I want to use the attributes. 16:23.370 --> 16:28.620 But as in the class that does name a drawing, then I will use this dot operators. 16:28.640 --> 16:38.640 Let me run this see person object has to be named because now we have not instantiated anything. 16:39.060 --> 16:40.770 It has no such attribute. 16:41.310 --> 16:48.130 Now what we will do now we have this munsie now I will create the person. 16:48.150 --> 16:50.380 So first of all, I have to run this function. 16:50.850 --> 16:52.170 So let me do this line. 16:52.260 --> 16:53.190 I will create 16:56.360 --> 16:57.110 a person. 16:57.330 --> 17:00.910 So when I say mantic dot create person, it will create a person for me. 17:00.930 --> 17:08.480 Now how will, how will we create the person now see this create a person needs certain information. 17:08.490 --> 17:09.960 What is the certain information. 17:10.380 --> 17:14.760 It needs self and it needs the person. 17:15.840 --> 17:25.290 When says we don't have to pass anything, it will take whatever information is present inside. 17:25.290 --> 17:33.320 Munsie this object which I have created, that is the object and it will put that by default. 17:33.480 --> 17:36.030 So you don't have to use this. 17:36.030 --> 17:38.420 You don't have to put anything in the set. 17:38.760 --> 17:42.420 OK, this is automatically taken care of now. 17:42.420 --> 17:46.130 We need to put in the person now that is the person. 17:46.440 --> 17:51.240 So let's go back and remember, we created the student one student to student three. 17:51.510 --> 17:54.460 So this already holds the required information. 17:54.480 --> 17:57.570 OK, so I put this student one inside this. 17:59.990 --> 18:02.480 Create person, student one. 18:03.230 --> 18:05.540 OK, I, I run this. 18:09.190 --> 18:17.290 OK, just a moment, it needs this underscore saying so you see, when I put this here, there was on 18:17.380 --> 18:18.180 school present here. 18:18.550 --> 18:20.410 So here I have got the underscore. 18:20.410 --> 18:22.750 So I'm doing Montegut, don't create person. 18:22.750 --> 18:24.850 And I've put this one inside. 18:24.850 --> 18:28.450 This what it has done this this student one is a list. 18:28.750 --> 18:32.360 This list contains what it contains the name, age and rule. 18:33.340 --> 18:37.620 So it takes those values and it creates a person. 18:37.810 --> 18:45.000 Now, it takes these values from this person and it puts it in Dusseldorf name self-taught age self-control. 18:45.370 --> 18:55.660 So this self contains what the self contains, all the values which are associated with Munsie, all 18:55.660 --> 18:58.750 the values which are associated with this particular object. 18:59.270 --> 19:01.820 OK, so I created this. 19:02.380 --> 19:04.890 Now let us go for it. 19:05.260 --> 19:12.340 OK, now if I do display person, ok, I'll create this person so I can see this 19:15.220 --> 19:20.740 person and which person I'm displaying I'm for displaying. 19:21.670 --> 19:28.770 So I you need to use it using munsie dot display person. 19:29.110 --> 19:31.770 OK, so I get this mounted display person. 19:32.290 --> 19:33.460 Now what will happen. 19:33.580 --> 19:34.510 I'll run this. 19:34.840 --> 19:43.060 It says Monte has been created because of this and from this display person it is displaying the entire 19:43.060 --> 19:44.230 sentence which we had. 19:44.470 --> 19:45.790 That is name of the person. 19:45.790 --> 19:47.050 Is this age of the person. 19:47.050 --> 19:50.380 Is this proportion of the person, is this right? 19:50.470 --> 19:53.230 All this information has been printed for me. 19:54.400 --> 19:57.880 Now, similarly, I can create multiple people, right. 19:57.970 --> 20:02.130 I can use this and create the other dugal. 20:02.740 --> 20:06.660 So I have this Nezha 20:10.030 --> 20:20.320 now and I put all here and I heard one also Swanzy. 20:23.530 --> 20:24.600 And I put. 20:27.750 --> 20:35.280 OK, and I'll put three here tonight on this, it is saying May has been created and the debate is going 20:35.280 --> 20:41.700 to has been created and the details now I have all these values now each time I want to access the attributes. 20:41.730 --> 20:43.090 Now, what was the problem here? 20:43.350 --> 20:45.330 What was the problem in case without boots? 20:45.630 --> 20:50.730 Each time when I had to find out the name and age, I will have to create a new reality when I'm keeping 20:50.730 --> 20:52.040 track of those variables. 20:52.260 --> 20:56.220 But now what I can do is I can directly use the object. 20:56.220 --> 20:57.870 So here I have the object. 20:57.870 --> 20:58.400 Nezha No. 20:58.410 --> 21:01.100 See, it has been created before Guernica. 21:01.350 --> 21:05.270 So if there was some trouble of getting over it and then it would have overridden. 21:05.280 --> 21:10.020 OK, but now what we simply have to do is we will say, huh, doc? 21:10.680 --> 21:16.780 Maybe we can see the value and we can put the same thing, OK? 21:17.100 --> 21:21.920 We can put the image, we can put rule. 21:23.190 --> 21:24.960 I can access all the details. 21:25.420 --> 21:27.780 OK, so it is as simple as that. 21:28.170 --> 21:30.720 I just need to create an object. 21:32.040 --> 21:39.330 And using that object, I can run these methods, I can run these methods on top of these objects, 21:39.690 --> 21:47.370 and I can also create and modify the variables, these attributes that is name age rule. 21:47.370 --> 21:51.510 You can have any number of attributes and you can modify those also. 21:51.930 --> 22:00.060 So this is how we will be using object oriented programming and this is how it is so useful and so easy 22:00.060 --> 22:00.640 to use. 22:01.440 --> 22:10.140 OK, now the next thing which we will be learning about is the concept of object and class, how we 22:10.140 --> 22:16.140 actually create the objects in class and the perfect way of doing it. 22:16.140 --> 22:19.710 And now what we have seen is just how it looks like. 22:19.920 --> 22:24.640 But we will be going in depth on this in the next session. 22:24.870 --> 22:25.290 Thank you.