Your First Python Program

Quick reference

• 00:04 All right, in this video, we're going to create and run our first Python program.
• 00:08 So I've opened up the Sublime Text Editor.
• 00:11 To open this thing, just head over to your Windows Start menu and type in Sublime,
• 00:14 and it'll pop right up.
• 00:15 And go ahead and click the icon, and this is what you should see.
• 00:18 So the first thing we want to do is save this file as a Python file.
• 00:21 So we can head over to File and click Save As.
• 00:25 And now we just want to navigate to our C drive.
• 00:28 So I'm going to click This PC, navigate to my C drive.
• 00:32 And I'm going to find that directory we created in the last video.
• 00:36 And remember, we called it python-excel, so
• 00:39 I'm just going to scroll through here till I get the P's.
• 00:42 And then I see this python-excel, so I can double click it.
• 00:46 And you can see there's our virt directory.
• 00:48 And so just right here we can name this anything we want.
• 00:52 Let's name this hello.py, and then go ahead and click Save.
• 00:57 And when we do that, we see up here it's saved it as hello.py.
• 01:01 If we want to navigate back to our Git Bash terminal,
• 01:04 we can type in the ls command to list the stuff in this directory.
• 01:08 And we can see, sure enough, here's this hello.py file that we just created.
• 01:12 And again, there's our virtual environment directory.
• 01:14 And so that's cool.
• 01:15 Let me clear the screen.
• 01:16 All right, so let's head back over to our Sublime Text Editor and
• 01:19 let's create our first Python program.
• 01:21 So let's type print and then parentheses in quotation marks.
• 01:27 And you'll notice when I type one parenthese,
• 01:30 Sublime automatically puts in the closing parenthese tag.
• 01:34 So that's kind of cool.
• 01:35 Same thing with quotation marks, when I type one quotation mark,
• 01:39 Sublime Text puts in two because you always want to close your tags.
• 01:43 So inside of here, let's type Hello World, okay?
• 01:48 So this is a print function.
• 01:51 It's sort of like a little program that runs inside your program.
• 01:55 And then inside of the parentheses,
• 01:57 we can pass any parameters we want into this print function.
• 02:02 And the parameters we want to pass is this text, these words and
• 02:06 letters, and specifically Hello World.
• 02:08 So let's go ahead and save this.
• 02:10 And when I got the Ctrl and the S key at the same time on my keyboard,
• 02:13 I think it's Cmd+S if you're on Mac or Linux, and then, or
• 02:16 you can come up here to File and then just click Save.
• 02:19 And you'll notice here it says again Ctrl+S, that's just a shortcut.
• 02:23 So now we've saved this file.
• 02:25 Now, in order to run this, we need to run this from the terminal.
• 02:28 And this is the way we're going to run all of our Python programs from here on out.
• 02:32 So head over to your terminal.
• 02:33 It's a good idea to keep your terminal just open whenever you're writing
• 02:36 your code.
• 02:37 Make sure that you're in your c/python-excel directory.
• 02:41 Make sure your virtual environment has been turned on.
• 02:43 If you have since closed this, since we set this up a couple of videos ago,
• 02:48 you just need to navigate back to that directory.
• 02:51 And to do that, we use the cd command, change directory, and
• 02:56 then just type in c/python-excel.
• 02:59 But like I said, we're already in this directory, and
• 03:01 we know that because we can see it right there, and so we're good to go.
• 03:04 So in order to run Python programs, all we have to do is type in python and
• 03:08 then the name of the file.
• 03:09 So our file is hello.py.
• 03:12 So we can run this.
• 03:14 And when we do, we see it prints out to the screen Hello World.
• 03:18 So if you see Hello World,
• 03:19 congratulations, you've created your first Python program.
• 03:22 Now, granted, this is not a very sophisticated program, but
• 03:25 it is the first program.
• 03:26 All coders always write Hello World, it's world famous.
• 03:29 We've all done it and now you've done it too.
• 03:31 So congratulations.
• 03:32 If you're on Mac or Linux and
• 03:35 this didn't work, try python3 hello.py.
• 03:40 So that won't work for us because we're on Windows, but Mac or Linux users,
• 03:44 that may work as well.
• 03:45 So okay, that's really all there is to running Python programs, very easy.
• 03:50 Again, you just type in Python and then the name of the file, and that's it.
• 03:54 So okay, and again, this is a very simple program, but just something to
• 03:59 get your feet wet and show you how to actually save and run Python programs.
• 04:04 In the next few videos,
• 04:06 we're going to spend a little while learning very basic concepts in Python.
• 04:11 Now, I'm going to assume you don't have any Python experience whatsoever.
• 04:14 If you do know a little bit of Python, this will be a great refresher.
• 04:18 If you don't know any Python at all, this will be not too complicated.
• 04:22 And it shouldn't be too hard to learn these things.
• 04:24 We're just going to look at very basic concepts to give you an idea of what
• 04:28 Python is capable of.
• 04:29 And also to give you the tools in order to write the code that we're going to use
• 04:33 throughout the rest of the course, connecting our Python with Excel and
• 04:36 all that good stuff.
• 04:37 So we'll start to look at those things in the next video.

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