WEBVTT 00:00.560 --> 00:01.240 Hey, friends. 00:01.320 --> 00:02.080 Welcome back. 00:02.440 --> 00:06.360 Now let's go and change our program in a way that we can use it in a better way. 00:06.400 --> 00:11.600 Okay, now, for example, I'm going to write Python and then Mac Changer dot Pi. 00:11.640 --> 00:18.640 I want to specify the interface like dash I or dash interface, and then eta zero. 00:19.960 --> 00:24.800 And then like dash M is going to be Mac address okay. 00:26.160 --> 00:26.880 Like this. 00:27.760 --> 00:29.440 So how can I do this. 00:29.480 --> 00:31.440 It is not very easy to do it okay. 00:31.440 --> 00:37.000 Because we need to specify this that these program understand this okay. 00:37.040 --> 00:42.360 Or get this argument from here not from inside the program. 00:42.360 --> 00:49.840 So it is very easy if we use a module called Optparse or Optparse. 00:49.880 --> 00:58.440 So let's use that okay I'm going to import that is Optparse and I'm going to use it here okay. 00:59.640 --> 01:02.800 So first we need to create its object. 01:02.840 --> 01:04.680 Let's name it parser. 01:04.720 --> 01:09.000 It is equal to Opt R dot. 01:10.080 --> 01:10.880 Opt. 01:11.280 --> 01:11.720 Parse. 01:14.560 --> 01:15.480 Parser. 01:15.520 --> 01:17.960 Let's remove this and write it from the beginning. 01:18.280 --> 01:20.760 It is OP sorry. 01:20.800 --> 01:21.760 It's option. 01:24.480 --> 01:25.120 Parser. 01:25.360 --> 01:29.960 So it is a function okay not a function is a class because it is start with capital. 01:30.000 --> 01:30.760 Capital letter. 01:30.760 --> 01:32.480 Anything that is started with capital letter. 01:32.880 --> 01:33.320 Yes. 01:33.840 --> 01:42.080 Remember that is a class and it has a lot of child and a lot of like methods function that we can use 01:42.080 --> 01:42.200 it. 01:42.200 --> 01:42.760 Okay. 01:42.800 --> 01:47.480 So here we have this parser right now which is an object. 01:47.480 --> 01:52.680 It has other function like adoption like a lot of things that we can use it okay. 01:52.720 --> 01:59.880 So here let's use it I'm going to say add ops parser dot add option. 02:00.720 --> 02:05.440 Add option is a method okay that here we can use it okay. 02:05.480 --> 02:10.320 So here I'm going to give dash I y dash I that means interface. 02:10.440 --> 02:19.120 If someone gives Or provide that I and the program should understand that it is an interface or the 02:19.120 --> 02:22.240 user could enter interface. 02:22.280 --> 02:22.680 Okay. 02:23.120 --> 02:32.360 So this board is going to be this is equal to enter paste okay. 02:32.400 --> 02:41.800 If someone write I or dash interface that means it is going to be interface okay. 02:41.840 --> 02:46.760 So it will get this interface from output. 02:46.760 --> 02:53.120 And then or we can write a help here okay. 02:53.160 --> 02:54.360 Help is equal to. 02:56.480 --> 03:02.280 Help is equal to let's say interface to change it. 03:02.840 --> 03:07.880 Make it interface to change its. 03:10.600 --> 03:12.440 Mac address. 03:13.080 --> 03:14.680 Now let me save this. 03:15.080 --> 03:18.760 And here I am going to Use. 03:18.760 --> 03:19.920 Partial dot. 03:21.320 --> 03:22.120 Partial dot. 03:24.840 --> 03:25.880 Uh. 03:25.920 --> 03:26.400 Hours. 03:30.160 --> 03:30.720 Hours. 03:31.920 --> 03:32.320 Okay. 03:32.840 --> 03:34.800 Now call it. 03:35.000 --> 03:35.520 And. 03:37.720 --> 03:38.920 I'm going to execute this. 03:38.920 --> 03:39.320 Okay. 03:39.880 --> 03:41.080 Let's come right in here. 03:43.240 --> 03:43.680 Okay. 03:43.680 --> 03:44.400 We have it. 03:44.520 --> 03:45.920 So we have Mac Changer. 03:45.920 --> 03:48.200 And now let's specify Dash I. 03:48.200 --> 03:55.000 And this interface is going to be either zero okay it is zero or let's go with dash help. 03:56.520 --> 03:58.680 Dash dash help. 03:59.080 --> 04:00.320 Let's hit enter. 04:00.360 --> 04:02.640 Now you see that I have an error here. 04:02.640 --> 04:07.800 And it is say option passed object has no attribute pass args okay. 04:10.360 --> 04:16.080 And that is my problem okay. 04:16.120 --> 04:19.960 Here we have a misspelling I think okay. 04:20.000 --> 04:26.560 It is not a r g e it is a r Gee, is that was my mistake. 04:26.560 --> 04:27.200 Sorry. 04:28.720 --> 04:30.200 Let's execute this again. 04:30.200 --> 04:30.840 And here. 04:30.880 --> 04:33.320 Now you see that it gives you options. 04:33.680 --> 04:34.520 Dash h or dash? 04:34.520 --> 04:34.800 Dash. 04:34.840 --> 04:37.840 Help show this help message and exit. 04:37.880 --> 04:43.040 So see we have dash I which is equal to interface and interface. 04:43.240 --> 04:46.840 And also it says that interface to change its Mac address. 04:46.880 --> 04:47.520 Okay. 04:47.560 --> 04:52.840 And it is saying that if you use Dash I with this it will change the interface. 04:52.840 --> 04:57.520 And also the help that this text that we write okay. 04:57.560 --> 04:59.600 Interface to change its Mac address. 04:59.600 --> 05:03.000 It is the text that we just write here. 05:03.040 --> 05:03.360 Okay. 05:03.400 --> 05:04.320 Write it down here. 05:04.760 --> 05:13.920 So now you learn okay slowly that how can we get an argument from user from output. 05:13.960 --> 05:15.080 So from terminal. 05:15.120 --> 05:15.800 Okay. 05:15.840 --> 05:23.200 So now let's go and see how we can get all and everything which was interface and also new Mac address 05:23.200 --> 05:28.320 and how we can use it down here to interact. 05:28.400 --> 05:30.240 So let's go and see that.