WEBVTT 00:05.070 --> 00:06.660 Everyone welcome back. 00:06.660 --> 00:11.470 So in the last video we stopped by installing the virtual machine of a button. 00:11.820 --> 00:19.170 And in this video we're going to basically install flask which is the main web you know web application 00:20.340 --> 00:25.440 package that we're going to be using to make our web services and we're also going to be setting up 00:25.440 --> 00:26.840 the hello world. 00:27.120 --> 00:28.940 And we don't have to understand everything. 00:28.950 --> 00:34.930 Hello world just to make sure that flask is installed correctly make sure everything's working and then 00:34.930 --> 00:40.050 in later videos we're going to be dissecting the hello world example and understanding what's really 00:40.050 --> 00:43.300 happening behind the hood. 00:43.740 --> 00:44.070 OK. 00:44.070 --> 00:50.480 So the first thing is we have to install a flask and flask is a Python package so we can install it 00:50.480 --> 00:51.300 right there. 00:51.570 --> 01:00.390 So you can click control of TV which will basically open a new terminal or if you want to go to just 01:00.630 --> 01:05.830 here and type terminal then you could already see terminal here and click on it. 01:06.030 --> 01:06.420 OK. 01:06.420 --> 01:13.690 So once you have your terminal open go to your desktop and then you're going to write pseudo app install 01:14.830 --> 01:25.560 Python 3 so you want first to install Python 3 that that is going to ask for your password and make 01:25.560 --> 01:27.110 sure you let it continue. 01:27.360 --> 01:32.680 And it will basically install BIOS and 3 that. 01:32.810 --> 01:43.490 OK so once Python 3 has installed you can go and write the install flask and then let it download flask 01:44.390 --> 01:45.450 and install it. 01:47.020 --> 01:53.960 And then once we're done then we now officially have that sort of flask. 01:54.130 --> 01:55.680 So let's just make sure. 01:55.720 --> 01:57.850 So less right by three. 01:58.360 --> 02:07.750 And then you can rent important flask from flask in port flask and there should be no problem here. 02:07.750 --> 02:10.810 So with installed flask successfully. 02:10.810 --> 02:16.590 Now let's let's start and do a new project in the platinum flask and just one. 02:16.600 --> 02:17.310 Hello world. 02:17.310 --> 02:20.140 See what how this really works in flasks. 02:20.140 --> 02:30.760 So let's first exit from here and then you can install any ID in a virtual machine. 02:30.760 --> 02:38.920 For me I like to use ATOM which is a free ID but I know that everyone has their own preferred ID to 02:38.920 --> 02:40.300 work on in Python. 02:40.360 --> 02:49.090 So I have not that any I didn't do any videos to install any of the ideas but if you haven't installed 02:49.120 --> 02:53.600 any ideas yet on this machine pause the video and make sure you install. 02:53.620 --> 02:55.840 Any idea whether it's at home. 02:55.990 --> 03:02.170 For me I use ADOM which is what it's going to come here. 03:02.200 --> 03:09.730 I enjoy this idea a text editor basically But if you have any other things which you enjoy and you enjoy 03:09.730 --> 03:15.160 writing code on then make sure to install it before completing the video. 03:16.210 --> 03:24.130 OK so I'll assume now that you have opened up your text editor or your ID and then just create a new 03:24.130 --> 03:26.790 file and then we're going to save it. 03:26.890 --> 03:28.990 Save it on the desktop. 03:28.990 --> 03:38.020 Create a folder and say let's call it tutorial one and then this file We're going to call it amped up. 03:38.030 --> 03:38.600 Why. 03:38.780 --> 03:43.910 OK now he doesn't have to be cold at all. 03:43.920 --> 03:44.290 He y. 03:44.290 --> 03:48.590 But you know it's just a convention and flask call it at IPY. 03:48.760 --> 03:52.710 But it does have to have the Y extension of course. 03:53.050 --> 04:00.670 OK so we will save that and then now we're going to be writing a very very basic web service in flask. 04:00.670 --> 04:05.410 This is basically a very easy hello world and you don't have to understand everything about it. 04:05.410 --> 04:08.090 We're going to explain everything in the later videos. 04:08.170 --> 04:11.090 So this is just to make sure that everything is working. 04:11.260 --> 04:15.220 So we're going to write from flask in port flask. 04:15.220 --> 04:20.690 Make sure it's a capital F and then app is equal to a flask. 04:20.830 --> 04:25.460 So the constructor a flask and then we do. 04:25.510 --> 04:36.440 And after route and then define and then hello world. 04:36.700 --> 04:41.160 We're going to find a new function called the lower level and we're going to return. 04:41.800 --> 04:44.160 Hello world. 04:45.160 --> 04:45.690 OK. 04:45.760 --> 04:53.180 And then finally we're going to come here and say its name is equal to. 04:53.830 --> 05:01.830 Or if a name is equal to mean then what do we do after a run. 05:02.320 --> 05:09.790 And in these nine lines of very few lines of code we have essentially wrote web service that works in 05:09.790 --> 05:10.650 flask. 05:10.930 --> 05:13.210 OK so how do we run this Web service. 05:13.210 --> 05:15.150 Obviously that's what we want to do. 05:15.460 --> 05:23.910 So if you come here to and let's list the directories Let's go into a tutorial one. 05:23.990 --> 05:32.920 Now once we're here we can see that up why file in front of us now you want to write that at the why. 05:33.020 --> 05:37.490 So we're going to first derived export flask. 05:37.700 --> 05:42.360 App is equal to and then wrapped up you why. 05:42.440 --> 05:47.150 So we're telling Flast that the name of the application that we're running is called apt up. 05:47.150 --> 05:47.670 Why. 05:47.810 --> 05:50.810 Because our file is called at the Y. 05:51.290 --> 05:57.010 Now once we export that we simply write flask run and that's it. 05:57.020 --> 06:05.360 We have a fully working application that is running on be as and this address over here and it's listening 06:05.420 --> 06:07.250 on port 5000. 06:07.310 --> 06:13.180 So if we copy this you can copy using Control shift C and then you go to your browser. 06:16.110 --> 06:22.650 And then write to here and then you're going to see in front of you hello world. 06:22.860 --> 06:28.080 And if you notice year you might you'll get a message also that says get and we're going to talk about 06:28.320 --> 06:30.690 this a lot more in the coming videos. 06:30.840 --> 06:33.240 But yeah that's basically the Laurell program. 06:33.240 --> 06:38.610 It's OK if you don't understand most of the stuff you're going to go into too much details off of every 06:38.610 --> 06:45.430 single part of what we wrote and you should be fine even if you don't understand anything so far. 06:45.450 --> 06:51.760 So if you have this halo wrote in your flask is fully installed and I will see you in the next video.