WEBVTT 00:00.760 --> 00:02.920 Okay, now our program is completed. 00:02.920 --> 00:05.080 And now let's execute this once again. 00:05.080 --> 00:05.920 And let's see. 00:06.400 --> 00:12.920 Okay we have Python and then we have Mac changer dot pi dash I. 00:12.920 --> 00:25.440 And it is for example eth zero okay something there is something this here I'm not going to give the 00:25.440 --> 00:26.160 Mac address. 00:26.160 --> 00:27.080 Let's hit enter. 00:27.520 --> 00:32.120 Oh my god I have a big error here okay. 00:32.120 --> 00:33.160 Let's handle this. 00:33.160 --> 00:36.960 Let's use decision making okay. 00:37.480 --> 00:42.440 So if someone not enter the interface or not enter the Mac address. 00:42.440 --> 00:45.560 So we don't need to see this part okay. 00:45.560 --> 00:48.560 We don't need to see a lot of things here. 00:48.880 --> 00:55.160 It is better to print a readable text here that please enter the Mac address. 00:55.160 --> 00:57.480 Or please enter the interface. 00:57.840 --> 00:59.000 So how can we do that. 00:59.000 --> 01:01.970 Let's come here and just imagine. 01:01.970 --> 01:03.170 I don't know how to do it. 01:03.370 --> 01:06.730 Let's come here and ask ChatGPT if for help. 01:06.770 --> 01:07.490 Okay. 01:07.530 --> 01:14.450 And here I'm going to say how to how to make a decision. 01:16.490 --> 01:19.010 How to make a decision. 01:19.010 --> 01:21.970 How to use decision making okay. 01:22.010 --> 01:23.090 How to use. 01:25.330 --> 01:29.850 Decision making in Python. 01:31.090 --> 01:35.850 And now let's see what is it going to tell me okay. 01:35.890 --> 01:41.450 Decision making in Python can be used if and else I think. 01:46.530 --> 01:46.890 Wow. 01:46.890 --> 01:50.010 It gives me a lot of examples. 01:50.010 --> 01:55.210 It gives me a lot of thing here that that could help me to do this. 01:55.210 --> 01:55.930 Okay. 01:55.930 --> 02:00.550 So now I have to tell you the summary of this thing that ChatGPT gave me. 02:00.550 --> 02:03.350 Okay, so we can make decision. 02:03.350 --> 02:08.390 We can use decision making in Python using if condition and else condition or Elif condition. 02:08.430 --> 02:08.830 Okay. 02:09.190 --> 02:15.790 So as you see here, we have the get argument here that is responsible for that okay. 02:15.790 --> 02:17.430 And for doing this. 02:17.670 --> 02:24.350 So if I want to do that here I have to move this back okay I will ctrl x that. 02:24.350 --> 02:27.790 And then instead of returning I need to use it here. 02:32.310 --> 02:34.230 Right here instead of return. 02:35.310 --> 02:36.630 So good. 02:36.830 --> 02:43.870 And here I need to use if and else if condition to handle this okay. 02:43.910 --> 02:47.430 So let's use if not okay. 02:47.470 --> 02:57.110 Options dot we had Mac address okay new Mac then let's print. 02:57.110 --> 03:01.800 Sprint, sprint or we have a parser. 03:01.800 --> 03:03.520 We're using parser here. 03:03.720 --> 03:06.320 So here I can use parser. 03:08.600 --> 03:10.040 Dot error. 03:10.160 --> 03:13.200 So it has a part that's called error. 03:13.200 --> 03:14.960 It has a function actually. 03:15.320 --> 03:19.600 And here I am going to give that error message here. 03:19.640 --> 03:24.520 For example it is going to be please specify. 03:26.960 --> 03:37.000 An interface for help or for more help or for help use dash dash help. 03:38.000 --> 03:40.040 Okay, so it is the if part. 03:40.080 --> 03:44.520 And also we have another option that is uh interface. 03:45.000 --> 03:45.760 Okay. 03:45.800 --> 03:48.120 Or here we could use interface. 03:48.120 --> 03:52.640 And in here as you see I use Mac address. 03:52.640 --> 03:58.580 So it is going to be interface Because that takes the messages for interface. 03:59.220 --> 04:09.020 And here we're going to use the Lf not options dot new Mac. 04:10.300 --> 04:11.500 Here let's print. 04:11.540 --> 04:15.020 Do not print use parser dot error. 04:16.660 --> 04:18.460 And here let's. 04:21.780 --> 04:22.620 Use. 04:22.660 --> 04:25.180 Please specify. 04:28.020 --> 04:34.540 Please specify the new Mac address. 04:36.580 --> 04:37.940 Or for help. 04:40.180 --> 04:42.540 Use dash dash L. 04:42.860 --> 04:45.500 Okay, now we have this all here. 04:45.500 --> 04:47.780 And here is the last option. 04:48.540 --> 04:54.300 If not, if someone provide interface and provide the Mac address. 04:54.630 --> 04:59.270 So here we need to do other thing that is the return option. 05:01.070 --> 05:01.750 Options. 05:02.190 --> 05:03.310 Why not argument. 05:03.310 --> 05:06.510 Because down here we are not going to use from argument. 05:06.510 --> 05:08.590 We're only using options. 05:08.870 --> 05:13.190 And here I am telling that options is equal to this. 05:13.190 --> 05:14.510 And here we are using it. 05:14.550 --> 05:15.550 Now save it. 05:16.510 --> 05:18.470 Let's come here back. 05:18.510 --> 05:23.310 And right now you see I am just providing interface and not the Mac address. 05:23.350 --> 05:30.510 Hit enter and okay I have an error on line eight. 05:30.550 --> 05:31.430 Okay. 05:31.430 --> 05:32.990 Invalid syntax. 05:37.470 --> 05:39.510 On line eight, this is the line eight. 05:39.910 --> 05:43.270 So as you see, I have forgotten to give the assignment. 05:43.270 --> 05:43.550 Okay. 05:43.590 --> 05:43.990 Here. 05:44.750 --> 05:45.350 Save it. 05:48.230 --> 05:50.750 And let's re-execute the program. 05:52.550 --> 05:54.450 As you see this time it is telling. 05:54.450 --> 06:04.130 Please specify new Mac address and if I not specify the interface and dash m for example 0011. 06:10.570 --> 06:13.570 Okay, this time it is telling me to provide the interface. 06:15.210 --> 06:21.650 If I just provide dash I and it is eth0. 06:23.770 --> 06:30.250 And now if I hit enter operation not permitted, no problem because I haven't used sudo. 06:35.370 --> 06:36.130 Okay. 06:37.210 --> 06:41.730 And you see nothing happened and means no error here. 06:41.890 --> 06:43.730 That means it has happened successfully. 06:43.810 --> 06:49.890 Okay, so thanks for watching and I'm so glad that you finished this part. 06:50.410 --> 06:53.090 See you in the next section.