WEBVTT 00:00.150 --> 00:07.770 So you have a telegram account, your account is correctly configured and you have created a bot with 00:07.770 --> 00:08.920 the bot fader. 00:08.940 --> 00:14.640 You also have the group here with at least you and the bot. 00:14.970 --> 00:21.780 Now, in this lesson we are going to write some Python code so that the bot can respond to some comments. 00:21.790 --> 00:29.700 So for example, if I do slash start here so nothing happens, but we are going to respond to that command 00:29.700 --> 00:30.870 from the Raspberry Pi. 00:31.080 --> 00:37.050 So what you're going to see when you send slash stat from the telegram application that can be from 00:37.050 --> 00:41.550 the desktop or from your phone or from anywhere, you're going to get a response here. 00:42.180 --> 00:42.900 Let's do that. 00:42.900 --> 00:46.980 So we already have the token in the previous lesson. 00:46.980 --> 00:51.060 We have gotten the token here from the bot father. 00:51.060 --> 00:58.270 We have stored the token inside a file and now we get the token inside our Python program. 00:58.290 --> 01:06.060 Now, to be able to write some program for the bot, we will install a python module and this python 01:06.060 --> 01:08.520 module is named Python telegram. 01:08.520 --> 01:13.710 But so first of all, make sure you have pip three so sudo apt. 01:15.140 --> 01:18.470 Install python three dash pipe. 01:20.160 --> 01:21.030 Look from. 01:21.030 --> 01:21.780 It's already done. 01:21.780 --> 01:23.250 And then p IP three. 01:25.550 --> 01:29.330 Instal python dash. 01:29.630 --> 01:30.500 Telegram. 01:30.860 --> 01:31.440 Dash. 01:31.490 --> 01:32.210 But. 01:32.390 --> 01:34.070 And then you can also add dash. 01:34.070 --> 01:36.320 Dash, upgrade. 01:40.130 --> 01:44.180 And for me that was actually already installed. 01:44.690 --> 01:51.410 So now that you have the Python telegram bot module, let's use it in the code. 01:51.830 --> 02:02.470 So you're going to do from Telegram dot X to import the data and command handler. 02:02.640 --> 02:07.190 I'm just going to explain to you what this is and what it does. 02:07.910 --> 02:10.370 So we have the telegram token here. 02:10.370 --> 02:18.740 I'm going to first create a data set of data is equal to data and you need to give the tokens token 02:19.730 --> 02:20.930 is equal to. 02:21.820 --> 02:22.570 Telegram. 02:24.130 --> 02:24.670 Token. 02:25.120 --> 02:28.660 So the telegram token you have read from the file. 02:28.840 --> 02:36.430 So basically, the updater will allow this program here to well being kept updated of what's happening 02:36.520 --> 02:40.390 in the Telegram application when you send some message to the bot. 02:40.690 --> 02:52.310 And then on top of the data, we are going to add a dispatcher is equal to the data dispatcher. 02:53.320 --> 02:58.530 So the data will keep track of what's happening in the application. 02:58.540 --> 03:05.440 The dispatcher basically will take the comments that you send, for example, stat and will dispatch 03:05.440 --> 03:10.960 them to the correct callback function that we are going to write now. 03:11.770 --> 03:19.330 So for each keyword that you want the bot to respond to, you can add a command handler so we can do 03:19.330 --> 03:33.910 DISPATCHER Dot add handler and then use the command handler, command handler with first duty world. 03:34.270 --> 03:36.220 So the keyword will be start. 03:36.220 --> 03:41.840 For example, this is a common keyword that we will use for every bot to start with. 03:41.860 --> 03:44.950 And then let's say start handler. 03:45.490 --> 03:48.010 This is the function we will need to create. 03:48.310 --> 03:50.320 I closed the two parenthesis here. 03:50.680 --> 03:55.180 So while the code here, there is very nothing to understand. 03:55.180 --> 03:55.930 This is just like that. 03:55.930 --> 04:01.540 You create a data and then a dispatcher and you add for each keyword you want. 04:01.570 --> 04:05.890 You add a command handler with add handler, and that's going to be the same every time. 04:06.610 --> 04:09.730 And now that we have this, well, we need to create our. 04:09.730 --> 04:11.080 So let's create it. 04:11.470 --> 04:17.020 E we need to create def start handler. 04:17.820 --> 04:25.350 So we need to create the callback function that will be called when we send the stat command on the 04:25.350 --> 04:26.310 application. 04:26.700 --> 04:34.350 And you are going to receive two parameters which are update and context. 04:36.090 --> 04:44.670 And well, here what you can do is you can process the request and you can also actually respond to 04:44.790 --> 04:45.420 the request. 04:45.420 --> 04:48.780 So here to respond to the request where you need to do context. 04:51.040 --> 05:02.500 Dot, but can you get the bot from the context parameter dot send message you need to give to arguments, 05:02.530 --> 05:05.620 chat, ID and text. 05:05.620 --> 05:10.240 So for the chat ID you're going to do chat id is equal to update. 05:10.960 --> 05:13.000 Not effective. 05:14.840 --> 05:22.910 Chat dot ID and for the text you do text equal to and just the text you want. 05:23.600 --> 05:28.280 Let's say hello from Python. 05:30.270 --> 05:31.890 Again, how to know you need to do that? 05:31.890 --> 05:34.920 Well, that's basically what they say in the documentation. 05:35.160 --> 05:38.160 There is no really any logic here. 05:38.160 --> 05:40.290 This is just how to use the bots. 05:40.410 --> 05:47.400 So context bots send a message with the chat ID, which is basically the chat ID we got. 05:48.540 --> 05:48.960 Here. 05:49.110 --> 05:54.690 So every chat So this group chat here has an ID and this is the ID we get. 05:54.690 --> 05:59.550 So we send the message to this chat ID with this text. 06:00.150 --> 06:07.840 Now that we have the handler, we need to do a data dot start pulling. 06:08.370 --> 06:13.380 So it will start being updated and then, well, if we just leave it like this, the program is going 06:13.380 --> 06:14.090 to end. 06:14.100 --> 06:20.090 So I'm going to start with the data dot idle like this. 06:20.100 --> 06:27.420 This is going to make the program block here and continue to start pulling from the bot so that when 06:27.420 --> 06:30.720 we receive a command, it goes to the dispatcher. 06:30.720 --> 06:36.660 And then we have, for example, the START keyword, which is going to call the start handler callback 06:36.660 --> 06:37.530 function here. 06:37.530 --> 06:39.810 So let's run that. 06:40.350 --> 06:41.520 Let's run the script. 06:42.240 --> 06:46.290 Actually, maybe we can just add, let's say here the print. 06:48.700 --> 06:51.700 KG, but ready. 06:53.140 --> 06:53.770 Like this. 06:53.770 --> 06:55.030 So we have an output. 06:55.030 --> 06:57.010 So let's run that with the print. 06:58.910 --> 06:59.610 Okay, We can see. 06:59.630 --> 07:02.560 Telegram got ready, and now you can see the pram is stuck. 07:02.570 --> 07:06.890 So it's waiting for commands that you send on the chat. 07:06.890 --> 07:08.150 So now you go on the chat. 07:08.150 --> 07:13.880 So whether on the desktop or in the mobile and you do slash start. 07:15.590 --> 07:19.120 And you can see we receive hello from Python. 07:19.130 --> 07:20.990 So this is correctly walking. 07:21.380 --> 07:23.810 And you can do that as many times as you want. 07:23.990 --> 07:24.800 Start. 07:25.670 --> 07:28.340 Hello from Python If you send anything else. 07:29.660 --> 07:31.220 Anything else for example? 07:31.580 --> 07:36.980 Well, you have nothing because you don't have a command handler. 07:37.220 --> 07:43.130 And so here we start with the start keyword, which is usually what you're going to do with a bot. 07:43.250 --> 07:48.440 But then you can basically duplicate this line for every keyword that you want. 07:48.830 --> 07:54.920 So you add the keyword and then you create a callback for this keyword. 07:55.190 --> 07:59.480 And usually what I do is I just put the keyword with Handler. 07:59.690 --> 08:01.910 So that is pretty explicit. 08:01.910 --> 08:04.550 And now, well, when you run this. 08:05.770 --> 08:11.230 If you want to stop the program here, you just do control C and you wait a bit. 08:12.340 --> 08:16.360 You wait a few seconds and you can see now the program has exited. 08:18.180 --> 08:18.600 All right. 08:18.600 --> 08:24.330 And one last thing is, if you want to get more documentation, you just type Python telegram bot on 08:24.330 --> 08:29.700 Google or any search engine and you're going to find the documentation here. 08:31.080 --> 08:37.920 So you have the page, that's the page, and you can find the introduction, documentation, the API, 08:37.920 --> 08:39.690 every command that you can use. 08:40.650 --> 08:46.350 So in this course I'm going to keep things quite simple so we can reach the final project quite quickly 08:46.350 --> 08:48.360 with the minimum functionalities we need. 08:48.360 --> 08:52.110 And then you can refer to the documentation for more complex behaviors.