WEBVTT 00:00.540 --> 00:07.920 High in this session, we will discuss about encapsulation, so encapsulation allows us to restrict 00:08.280 --> 00:15.600 access to attributes and methods of a class by adding double underscored in front of the attribute or 00:15.870 --> 00:17.070 method definition. 00:17.580 --> 00:25.980 So whenever these methods and attributes become internal to class and can be accessed by the class itself 00:25.980 --> 00:29.400 and are not Colleyville outside the class, so let us see. 00:29.400 --> 00:38.940 I have certain methods or which actually modify the salary of the person, and I don't want any external 00:38.950 --> 00:45.900 method or anything else to actually be able to access the salary of a person because it is something 00:45.910 --> 00:48.020 which is related to the security of the person. 00:48.030 --> 00:49.560 It is the privacy of the person. 00:49.920 --> 00:57.240 So what I can do is I can make the salary and the methods which are excessive, the existing the salary 00:57.510 --> 00:58.470 as private. 00:58.890 --> 01:06.480 I can make them private by adding this double in the school in front of the variable or the attribute 01:06.480 --> 01:11.410 which is containing the salary or any variable which I want to make private. 01:11.760 --> 01:13.080 So that is all I can do it. 01:14.220 --> 01:20.490 So let's get further and implement encapsulation. 01:22.350 --> 01:26.280 So here I'll be implementing the same. 01:26.280 --> 01:32.690 So here I'm creating a class employee and I have a book inside this object. 01:32.700 --> 01:38.000 So this object is the old class which I am importing. 01:38.010 --> 01:43.900 So you would have understood by the pattern which is written here. 01:44.100 --> 01:46.500 So here how we write you. 01:46.650 --> 01:51.770 When we are creating a class inside the prisons, we usually provide the best class. 01:51.930 --> 01:58.430 So here we are using object as the base class for this particular class and we will start the definition. 01:58.440 --> 02:13.080 So we see death and we give the unit and we give the self inside this and then we will see says the 02:13.530 --> 02:17.430 name is equal to any name. 02:17.430 --> 02:18.540 See my name. 02:19.480 --> 02:22.360 Then we say says don't. 02:23.370 --> 02:26.340 Each is equal to any age. 02:27.390 --> 02:32.430 Then you say say not double under score. 02:32.430 --> 02:43.050 Salary is equal to the salary of the person, whatever the salary is right now what we do is we are 02:43.050 --> 02:44.560 creating an object of it. 02:44.580 --> 02:47.750 Now this is my class and I want to create an object of this class. 02:48.000 --> 02:52.410 So let's say I create an object, object one or we do one. 02:52.710 --> 02:57.140 And from this object, I want to create an instance of this. 02:57.420 --> 03:02.340 So let me get this and say employ 03:05.250 --> 03:09.540 and I can access the details of this. 03:11.100 --> 03:24.540 I can access from object one dot name for B.G., one dot age so I can print this right. 03:24.540 --> 03:30.990 And I can simply say print and I can print this here again. 03:30.990 --> 03:36.530 I can say print and I will be able to print this again. 03:38.490 --> 03:43.570 So let me love this so you can see I can I'm able to see the name on the image of the person. 03:44.070 --> 03:45.480 Now let me do one more thing. 03:45.480 --> 03:46.750 Let me I've decided. 03:48.510 --> 03:53.200 So now I'm doing the same thing and I'm putting silalahi here. 03:57.120 --> 04:03.220 Now, what happens here is it gives me this error, which is employee object has no attribute, double 04:03.310 --> 04:04.380 endoscopes gallery. 04:04.620 --> 04:09.170 So this is because it is treating it as internal in nature. 04:09.300 --> 04:18.130 It does not want to show it to other objects or any other function or any other method. 04:18.360 --> 04:22.140 So it is saying that it has nothing as a salaried set. 04:22.620 --> 04:24.250 So it is hiding it. 04:24.300 --> 04:26.280 This is called encapsulation. 04:26.280 --> 04:29.850 Encapsulation is basically data hiding. 04:30.300 --> 04:37.410 We are hiding this particular data from any other external sources and we are showing it only to the 04:37.410 --> 04:38.420 class itself. 04:38.430 --> 04:45.180 So any function which is present inside this particular class will be able to access this salary. 04:45.420 --> 04:50.670 But except from that, any other class or any other object will not be able to access this. 04:51.810 --> 04:53.210 So how we can do that? 04:53.220 --> 04:55.440 So let's do one thing. 04:55.440 --> 04:57.970 Let us see how we can modify that. 04:57.970 --> 04:59.890 So for that, let us feed on a. 05:00.120 --> 05:07.450 Examples will be class person and we put in objects again. 05:09.630 --> 05:15.650 Now we see death and now I'm creating see the. 05:25.370 --> 05:34.930 And each time a assigning name and age and I'm creating self and I'm giving names and I'm giving each 05:36.100 --> 05:49.710 next, I will go further and say self-taught name is equal to a name, age old age, self-taught. 05:54.140 --> 06:02.020 Now I'm getting the name and so I'm taking these now let me get this in a private one and let me create 06:02.030 --> 06:03.230 a private function. 06:03.420 --> 06:05.960 OK, so I create a private function. 06:06.440 --> 06:14.790 Let me move this one unclarity and I'm defining another function of this function is again, double 06:14.840 --> 06:18.620 underscored the split and it again, big self. 06:20.570 --> 06:23.390 And what it does is it simply prints 06:27.260 --> 06:32.150 itself, both name and self, 06:35.150 --> 06:37.130 not double under scrutiny. 06:37.170 --> 06:39.080 So this will display the name and age. 06:39.530 --> 06:42.100 And now let me run this from here. 06:42.110 --> 06:45.610 So I thought that will underscore the split. 06:46.040 --> 06:52.340 So I'm running this function from inside and after that I'm seeing it, Don. 06:55.070 --> 06:59.810 OK, now I don't run from this also. 07:02.130 --> 07:02.540 OK. 07:02.960 --> 07:06.380 And after that, I create an object so I can see for one. 07:07.120 --> 07:13.870 This is my first post and this is the person. 07:13.880 --> 07:16.430 So now it will create the person for me. 07:20.300 --> 07:27.050 Further, I see, for one thought, let me copy this so that this. 07:45.180 --> 07:53.400 So now what we have done is we have created the last person in that class person, we have created a 07:53.400 --> 08:03.970 fine name and age which takes name and age, and it assigns it to self and so forth, each leader. 08:04.020 --> 08:14.820 We have created a sense of this, which is actually and private method, which will again bring the 08:14.940 --> 08:16.740 name and age for this. 08:18.410 --> 08:20.030 Now, let us run this. 08:24.610 --> 08:29.430 So as we as this you can see there is no problem in running the design name and age. 08:30.040 --> 08:31.690 Next, we'll try to run the. 08:33.350 --> 08:36.950 This limited affects, so when you say for one. 08:38.730 --> 08:40.400 Not sign. 08:44.770 --> 08:48.130 So it's an anticipated. 08:54.360 --> 08:58.510 So when we're on this, we get an Ed Wood says personal object has more to go. 08:59.160 --> 09:02.160 Now, that is a common thing because it is a private matter. 09:02.670 --> 09:10.400 So now what we do is let us run the letters again, forget the name very clearly. 09:10.690 --> 09:15.450 And this one is, for one, the name. 09:17.140 --> 09:22.510 There's no problem in giving the industry the edge so to for one's 09:25.990 --> 09:26.490 age. 09:27.730 --> 09:30.790 So, again, the same thing, of course, an object has no of. 09:31.450 --> 09:34.810 So this is the property of glasses. 09:34.810 --> 09:43.570 When we use double store in front of any other method of defining it, then it will act as a private 09:43.570 --> 09:44.010 matter. 09:44.050 --> 09:51.790 That is, you cannot access it outside the method and it will be accessible. 09:54.810 --> 10:01.860 You can access it from any other method, so if I want to access it from this, from his name and age, 10:01.940 --> 10:04.190 I am able to access it. 10:04.440 --> 10:11.700 So whenever I've done this particular line, then it is being printed because it is right. 10:11.720 --> 10:18.300 We have just given the assignment to name and age and after that we have uncensored history. 10:18.630 --> 10:26.850 Now, if I don't give this, you can see and I will run this line so we won't give anything. 10:27.300 --> 10:36.540 So this means that it is running the cell door and is being drawn and also it is running from the Internet 10:37.020 --> 10:40.400 itself, but it is not even run it from outside.