1 00:00:00,780 --> 00:00:04,110 So we have a running website which looks quite good. 2 00:00:04,110 --> 00:00:07,510 The problem is that this is in our local host. 3 00:00:07,800 --> 00:00:10,780 So the only person seeing this is you. 4 00:00:11,010 --> 00:00:14,970 Or someone who has access to your computer. 5 00:00:15,000 --> 00:00:21,930 So what we want to do instead is to deploy this website on a web server or on cloud as we will do 6 00:00:21,930 --> 00:00:23,260 in this course. 7 00:00:23,540 --> 00:00:25,600 I will be using the Heroku Cloud. 8 00:00:25,800 --> 00:00:31,650 Heroko is a service that allows you to deploy Python applications in their Cloud. 9 00:00:31,650 --> 00:00:36,750 The good news is that you can deploy an application for free and you can have your public domain for 10 00:00:36,750 --> 00:00:43,960 free as well though you'll need a subdomain of Heroku so o something like let's say Ardit.heroku.com. 11 00:00:44,010 --> 00:00:51,720 However if your site will have a lot of traffic later on you want to actually upgrade your plan and buy 12 00:00:51,720 --> 00:00:56,030 more bandwidth. Deploying on Heroko is relatively easy. 13 00:00:56,040 --> 00:01:00,290 You don't have to think to do any administrative work. 14 00:01:00,300 --> 00:01:07,950 So Heroko saves a lot of time and effort so that you can focus on programming instead of the server parts. 15 00:01:07,950 --> 00:01:17,010 Before deploying to Heroku though we need to do something. There is something that we should have done 16 00:01:17,010 --> 00:01:19,700 since in the beginning of the section. 17 00:01:19,710 --> 00:01:26,550 So even before writing any file here. What you should do is that you should create a virtual environment 18 00:01:27,120 --> 00:01:32,690 which is isolated from your other files from your main Python installation. 19 00:01:32,820 --> 00:01:39,720 So to run our application we use Python which is coming from our main installation. 20 00:01:40,710 --> 00:01:49,980 So this one here, the ones I have here. This is not a good practice. A good practice is to actually have a clean 21 00:01:49,980 --> 00:01:53,430 installation of Python which is used only for application. 22 00:01:53,610 --> 00:01:58,920 So in that installation you don't want to have libraries installed, the libraries that you don't need 23 00:01:58,920 --> 00:02:01,470 for building fast applications. 24 00:02:01,470 --> 00:02:04,760 Therefore we need to create a virtual environment. 25 00:02:05,100 --> 00:02:09,030 And here I will show you how you can do that. To create a virtual environment 26 00:02:09,030 --> 00:02:15,840 you need to use a Virtualenv Python library and to use the virtual Python library you need to install Virtualenv 27 00:02:15,840 --> 00:02:19,440 So pip install Virtualenv. 28 00:02:19,790 --> 00:02:30,280 So we are using the main Python isolation here to install Virtualenv. Great, that was successful installed. 29 00:02:30,610 --> 00:02:34,270 And now we will create a virtual environment. 30 00:02:34,280 --> 00:02:41,070 The virtual environments should be created at the same level with a main folder that holds the 31 00:02:41,070 --> 00:02:43,600 application files. 32 00:02:43,650 --> 00:02:52,890 So if we go to our directory just here, here is where the files are and what I'll do is create a main 33 00:02:52,890 --> 00:02:54,690 folder in here. 34 00:02:54,940 --> 00:02:58,290 And call it my site. 35 00:02:58,290 --> 00:03:03,790 And I'd close Atom for a while and this would go inside this. 36 00:03:03,900 --> 00:03:10,650 So just here and now you can open Atom in this directory because here is where we will create 37 00:03:10,650 --> 00:03:13,140 the virtual environment. 38 00:03:14,370 --> 00:03:22,860 So let's open the command line now and we are ready to create a virtual environment and to do that you 39 00:03:22,860 --> 00:03:31,200 should use a Virtualenv library by saying Python, the M argument, then you have Venv which is the 40 00:03:31,200 --> 00:03:33,560 name of the library, of the module. 41 00:03:33,750 --> 00:03:41,190 And M here is an argument who allows Python to locate modules for execution as scripts. 42 00:03:41,430 --> 00:03:47,830 Then you need to specify a name for the folder where the virtual environment files will be stored in. 43 00:03:47,840 --> 00:03:48,140 44 00:03:48,150 --> 00:03:50,100 So that should work. 45 00:03:50,140 --> 00:03:58,140 Let's see. The virtual folder was created and the environment was created successfully. 46 00:03:58,250 --> 00:04:04,890 What we have here is an isolated installation of Python and inside Scripts you will see that you have 47 00:04:05,070 --> 00:04:07,910 Python there. 48 00:04:07,940 --> 00:04:09,100 Here it is. 49 00:04:09,480 --> 00:04:09,900 Ok. 50 00:04:09,900 --> 00:04:11,430 Don't worry about that. 51 00:04:11,790 --> 00:04:13,340 And here is pip as well. 52 00:04:13,400 --> 00:04:15,420 So pip.exe. 53 00:04:15,900 --> 00:04:18,710 And that means you can use that Python if you like. 54 00:04:19,010 --> 00:04:27,390 Let me try out. So we are now at the My site directory. 55 00:04:27,480 --> 00:04:39,090 That means we need to refer to virtual, Scripts and Python and that will trigger or fresh Python in the 56 00:04:39,090 --> 00:04:40,140 console. 57 00:04:40,140 --> 00:04:45,550 However we are not interested to actually run Python from the shell. 58 00:04:46,140 --> 00:04:53,670 So I'll just exit this and what we're interested instead is to actually run the Flask application using 59 00:04:53,680 --> 00:04:55,790 the fresh installation of Python. 60 00:04:56,040 --> 00:05:01,830 But before we do that we need to actually install Flask in our virtual Python if you like and to do 61 00:05:01,830 --> 00:05:06,370 that you need to use the pip library of your isolated Python. 62 00:05:07,250 --> 00:05:15,110 So you need to point to the visual folder, to the script folder then and then to pip install flask. 63 00:05:19,920 --> 00:05:26,100 And so flask is installing and it also installed its dependencies. 64 00:05:26,330 --> 00:05:27,770 And we should be good to go now. 65 00:05:27,960 --> 00:05:36,870 So let's run our web app using our new installation of Python. To do that you need to point to the new 66 00:05:36,930 --> 00:05:47,230 Python and then to demo because we are in my site now, as you see here. So Demo backslash script1.py. 67 00:05:47,230 --> 00:05:47,750 68 00:05:48,000 --> 00:05:54,750 That should work. Great and if you go to the website now 69 00:05:57,750 --> 00:06:00,320 you'll see that it's working fine. 70 00:06:00,640 --> 00:06:01,490 That's it. 71 00:06:01,500 --> 00:06:07,440 Now you are more than ready to deploy your Flask application on the Cloud and we will do just that in 72 00:06:07,440 --> 00:06:08,480 the next lecture. 73 00:06:08,640 --> 00:06:14,550 And I would like to mention again that please keep in mind that you should always create a virtual environment 74 00:06:14,760 --> 00:06:17,360 before you create your Flask application. 75 00:06:17,700 --> 00:06:22,080 So before writing any code you should use a fresh installation of Python.