First Program

Quick reference

• 00:04 Okay, so we've installed all the things,
• 00:06 now it's time to start playing around with this stuff and actually using it.
• 00:09 So head over to your Windows start menu and type in git bash,
• 00:13 it's just G-I-T B-A-S-H.
• 00:15 And the git bash terminal will pop up, go ahead and click it and
• 00:18 this is what you should see.
• 00:19 Mine says flatplanet@flatplanet-PC, that's the name of my computer,
• 00:23 that's my username,
• 00:24 yours will be different obviously based on whatever your username is.
• 00:28 No, I don't think the world is flat I just find it hilarious that some people do so
• 00:31 I named my computer that.
• 00:33 You can type in pwd to see which directory you're in and we're in c/users/flatplanet,
• 00:38 again this will be different based on whatever your computer is called.
• 00:42 So what we need to do now is create a directory where we
• 00:45 can hold all the Python files we're going to create through this course.
• 00:48 So to do that you just type mkdir, and
• 00:52 that command is the same whether you're on a Windows or Mac computer.
• 00:56 Now where do we want to put this?
• 00:57 We could put it on /c/, and then let's call this directory python-course,
• 01:02 you can call it anything you want, but we're creating a Python course.
• 01:06 Now if you're on a Mac or Linux, obviously you're not going to type in C because
• 01:10 Mac and Linux don't have C drives, they have something else.
• 01:13 Save that wherever you want on your Mac or
• 01:14 Linux doesn't matter at all just make a note of where you saved it.
• 01:17 So that's pretty much all we need to do to make a directory.
• 01:20 Now we need to move into that directory and to do that, we do cd, change
• 01:25 directory, and just type in the name of the directory again, so python-course.
• 01:31 And when you do, you see, boom, it shows we're in fact in that directory or
• 01:35 we could type in pwd again to see, yep, we're in that directory.
• 01:39 And we could type ls to list the stuff in this directory and
• 01:42 you notice there's nothing in there, so, so far so good.
• 01:45 So let's clear the screen here, so now head over to your Windows start menu and
• 01:49 type in Sublime, and this should pop up, this is the Sublime text editor.
• 01:53 First things first head over to project and click, Add Folder to Project, and
• 01:57 just navigate through your C drive and find that directory we just created.
• 02:02 So it is see, python course there it is, click it once to highlight it and
• 02:09 then click the Select Folder button and you see, boom, it pops right up.
• 02:13 Let's go ahead and create a file right now and let's just click,
• 02:17 File Save As, and again, navigate to that Python course directory.
• 02:22 We're already in that directory but if you weren't for some reason just go to C and
• 02:26 then search for python course, there it is.
• 02:30 Now let's name this file, hello.py and
• 02:34 all Python files end in .py, that's how our computer knows they're Python files.
• 02:39 So if we hit Enter, you notice it pops right up here so we can close this here
• 02:43 and then if we want to open it again, we just click it right there.
• 02:46 So now throughout this course all of our files will be listed on the left hand side
• 02:49 here, very nice.
• 02:50 So let's write our first Python program, so let's type in print and
• 02:54 in parentheses and in quotation marks, and let's just type in, Hello World, right?
• 02:59 So go ahead and hit Ctrl + S on your keyboard, Cmd + S if you're on a Mac
• 03:03 to save this file, or you can come over here this file and save and that's it.
• 03:08 We're going to talk about this program more in the next video get into exactly
• 03:11 what this is but for now, let's just go ahead and run the file.
• 03:14 So head back over to our terminal, make sure you're in that directory and
• 03:19 type in, python, and then the name of the file, so it's, hello.py, and
• 03:23 this is how you run all python programs.
• 03:26 You type python and then the name of the file and
• 03:28 you see, boom, Hello world it prints right to the screen and that worked.
• 03:32 Now, if you were in a different directory than our python-course,
• 03:37 remember we added Python to pass, so we can run this from anywhere.
• 03:41 You would just do the same thing Python, you just be explicit, type in
• 03:45 /c/python-course/hello.py, same thing, Hello world.
• 03:50 We're already in that directory, so we don't have to do that every time we can
• 03:54 just type in python, and then the name of the file.
• 03:56 So congratulations, you've written and run your very first python program.
• 04:00 This is the first program that all coders do, it's always the
• 04:04 Hello World program and very very simple.
• 04:06 Like I said we're going to talk about what this is and
• 04:09 what's going on in this file and all that good stuff in the next video.
• 04:12 I just wanted to kind of get us running and do something in the terminal and
• 04:16 in the Sublime Text Editor, so you see how those work.
• 04:20 So very, very cool and it's just that easy to start doing Python.
• 04:24 In the next video, we'll go ahead and start to talk more about this program,
• 04:27 explain what some of these things are.
• 04:29 And we're going to also talk about comments in the next video and
• 04:35 that'll be coming right up.

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