Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:05,240 --> 00:00:08,580 So it's a tradition, when learning any new programming language, 2 00:00:08,580 --> 00:00:12,520 that the first program you write should print out the text Hello World, 3 00:00:12,520 --> 00:00:14,740 and we're going to do just that in this video. 4 00:00:14,740 --> 00:00:21,520 So start Intellij DEA, as I have, and choose Create New Project from the Main menu. 5 00:00:21,520 --> 00:00:27,760 Now if you're using a different IDE or editor, use its command for creating a new Python project. 6 00:00:27,760 --> 00:00:31,160 So we want to select Python, on the left hand side, as I've done here, 7 00:00:31,160 --> 00:00:39,080 and also make sure you've got a valid Python SDK selected at the top right, and click on Next. 8 00:00:39,080 --> 00:00:42,940 Once you get to this screen, you can type in the project name. 9 00:00:42,940 --> 00:00:47,620 So I'm just going type in there, Hello World. 10 00:00:47,620 --> 00:00:52,020 Now I don't like using spaces in the names of things, as that can cause problems. 11 00:00:52,020 --> 00:00:54,940 To make the name more readable, I've used Pascal case. 12 00:00:54,940 --> 00:00:59,660 I've used a capital H for the word Hello, and W for the word World. 13 00:00:59,660 --> 00:01:05,840 Now you can change the location if you want, but make sure you don't put one project inside another project directory 14 00:01:05,840 --> 00:01:10,080 So what I'm going to do, and I'll fix up that spelling first, 15 00:01:10,080 --> 00:01:14,880 I'm going to move to a new folder, just to show you what you would do, the first time you're setting this up. 16 00:01:14,880 --> 00:01:16,680 Then come to the folder. 17 00:01:16,680 --> 00:01:19,780 That's my main folder where I've got all my different programming languages. 18 00:01:19,780 --> 00:01:22,640 I'm going to create a new project. 19 00:01:22,640 --> 00:01:23,560 I need folder, rather, and I'm going to call 20 00:01:23,560 --> 00:01:33,200 this one python-masterclass-remaster-shared, and this is just a format that I've used on my computer. 21 00:01:33,200 --> 00:01:37,260 Alright, so scrolling up here, i'm gonna do the same thing that I've done for my java masterclass. 22 00:01:37,260 --> 00:01:44,080 I'm gonna create a subfolder called current Java masterclass remaster, but we're going to obviously call that Python. 23 00:01:44,080 --> 00:01:47,500 And this is just the way that I've set things up: 24 00:01:47,500 --> 00:01:57,420 python-masterclass-remaster, and I think I called it current at the start, so I'll put that current, 25 00:01:57,420 --> 00:02:01,100 and that's where all my projects are going to go, in that folder. 26 00:02:01,100 --> 00:02:06,140 Now the first time you do that, you create a new folder. If we look at the end of this project location, 27 00:02:06,140 --> 00:02:08,340 note that it hasn't got the project name there. 28 00:02:08,340 --> 00:02:16,360 So what you'll need to do for the very first project, is put a slash in there, and HelloWorld, being the name of the project. 29 00:02:16,360 --> 00:02:21,040 Subsequent times that you create new projects, it'll automatically find this project location, 30 00:02:21,040 --> 00:02:23,060 and put the project name after it. 31 00:02:23,060 --> 00:02:27,480 Alright, so at this point now that I've done that, I'm going to click on Finish. 32 00:02:27,480 --> 00:02:29,860 You're prompted now, do we want to create that folder? 33 00:02:29,860 --> 00:02:35,880 This is, I know it's a long path, but this is the path that I'm storing my files on a network drive, so for me that's valid. 34 00:02:35,880 --> 00:02:40,660 You would choose whichever folder you wanted to, and make sure that was valid and then click OK. 35 00:02:40,660 --> 00:02:43,640 At this point, IntelliJ is setting up the project. 36 00:02:43,640 --> 00:02:47,820 Now it won't take long but it's a good idea not to do anything until it's finished. 37 00:02:47,820 --> 00:02:51,360 So you can see the messages down there in the status bar, at the bottom of the screen. 38 00:02:51,360 --> 00:02:58,000 Wait for these to disappear, and you'll see IntelliJ uploading skeletons, whatever that means, and indexing the project, 39 00:02:58,000 --> 00:03:06,740 and then the project's been built and we should see the project pane open, and we'll be able to see some files there. 40 00:03:06,740 --> 00:03:09,760 Alright, so you can see now the project pane open. There's no more, 41 00:03:09,760 --> 00:03:13,300 well actually there is a bit, there's the updating skeletons message you can see down the bottom there. 42 00:03:13,300 --> 00:03:15,340 So we'll just give that a moment to finish. 43 00:03:15,340 --> 00:03:18,900 Once it's done that, we can get started. 44 00:03:18,900 --> 00:03:25,180 Alright, so you can see now it's finally finished. There's now no more working messages appearing in the status bar. 45 00:03:25,180 --> 00:03:29,040 So what we want to do is create a new file for our program. 46 00:03:29,040 --> 00:03:32,360 So you want to make sure the project pane is open and you can see it is there. 47 00:03:32,360 --> 00:03:35,480 If it wasn't, by the way, you can come over here and click on project, 48 00:03:35,480 --> 00:03:39,420 and that will open and close the project tab. So make sure that's open. 49 00:03:39,420 --> 00:03:42,840 So at the top of the project pane in bold, is the name of our project. 50 00:03:42,840 --> 00:03:45,060 That's Hello World in this case. 51 00:03:45,060 --> 00:03:47,880 So make sure that you click on this, which I'm doing now, 52 00:03:47,880 --> 00:03:52,920 before we do the next step, and once we do that the file menu changes, depending on what you've got selected. 53 00:03:52,920 --> 00:03:56,120 So after clicking on the Hello World project, which I've just done, 54 00:03:56,120 --> 00:04:01,380 I can either right click and select New, Python File. 55 00:04:01,380 --> 00:04:07,300 Alternatively, I could come up here after selecting that and click on File, New, Python File. 56 00:04:07,300 --> 00:04:13,380 Either way will do the same thing. Okay, I'm going to call this one helloworld. 57 00:04:13,380 --> 00:04:16,400 Then note that I've typed it all in lowercase with no spaces. 58 00:04:16,400 --> 00:04:23,700 IntelliJ will automatically add the dot py extension to the file, which is what Python files typically have as their source file, 59 00:04:23,700 --> 00:04:28,940 but if your IDE or editor doesn't do that, then you would type in the full name, helloworld.py 60 00:04:28,940 --> 00:04:30,580 I'm gonna click on OK 61 00:04:30,580 --> 00:04:35,440 and we can see there in the project pane to the left, that it has been named with helloworld.py. 62 00:04:35,440 --> 00:04:39,400 So at this point we've now got a new Python file open in the editor. 63 00:04:39,400 --> 00:04:43,260 I'll talk a bit more about these files and directories in the project pane later. 64 00:04:43,260 --> 00:04:50,060 The best advice I can give at the moment, is that if you didn't create a file or a directory, then don't mess with it. 65 00:04:50,060 --> 00:04:55,000 You'll get strange problems if you try and put anything in that .idea directory, for example. 66 00:04:55,000 --> 00:05:00,240 The only thing we're interested in at the moment, are the .py files that we create, 67 00:05:00,240 --> 00:05:04,240 and obviously helloworld.py is the one that we've created for this project. 68 00:05:04,240 --> 00:05:10,560 And for the moment they should all be created inside, directly inside, the HelloWorld project structure, 69 00:05:10,560 --> 00:05:12,280 and that's what we've done here. 70 00:05:12,280 --> 00:05:17,160 Alright, so in terms of the actual code for our first program, it's extremely simple. 71 00:05:17,160 --> 00:05:24,040 We're going to come up and start typing print left parenthesis, noting that a right one gets added for us automatically, 72 00:05:24,040 --> 00:05:28,300 single quote, noting that a second single quote gets added automatically, 73 00:05:28,300 --> 00:05:33,340 and if you're using another IDE or editor, you'll need to perhaps enter those manually yourself. 74 00:05:33,340 --> 00:05:38,680 We're going to type Hello, World and an exclamation mark, 75 00:05:38,680 --> 00:05:41,820 and that's literally it. That's our first Python program. 76 00:05:41,820 --> 00:05:47,780 To run the program, we want to right click anywhere here in the editor window, which is where we've typed our code, 77 00:05:47,780 --> 00:05:52,160 right click and click on Run Helloworld. 78 00:05:52,160 --> 00:05:55,620 You can see straight away, the output appears in the run window at the bottom, 79 00:05:55,620 --> 00:05:58,560 and that's initially configured to be at the bottom of the screen, 80 00:05:58,560 --> 00:06:01,200 and we can see the output, Hello World! 81 00:06:01,200 --> 00:06:03,760 And that's our first Python program. 82 00:06:03,760 --> 00:06:08,820 Although it's very simple, our Hello World program does include a few important basics. 83 00:06:08,820 --> 00:06:12,240 Firstly, we've used the Python function print. 84 00:06:12,240 --> 00:06:14,140 Python has many functions, 85 00:06:14,140 --> 00:06:19,260 such as mathematical functions like round, to round the number of digits after the decimal point 86 00:06:19,260 --> 00:06:25,740 and char, chr and ord, to convert characters to their numeric representations and vice-versa, 87 00:06:25,740 --> 00:06:27,240 as well as many more. 88 00:06:27,240 --> 00:06:30,580 You can also define your own functions, as we'll see later. 89 00:06:30,580 --> 00:06:34,640 In the next video, we'll see more ways to use the print function. 90 00:06:34,640 --> 00:06:37,520 See you in the next video. 10551