We will discuss the difference between an interactive python terminal vs. A python script. In case you missed it, here are the previous parts of the series: Python for Beginners, Part 1: How to Download and Install Python Python for Beginners, Part 2: Hello World Exercise Python for Beginners, Part 3: The Turtle Module Transcript 00:00 - Okay, in this video, 00:01I'm gonna go over the solution to the previous problem 00:03 that I posed to you, and also, 00:05 we're gonna learn how to write the turtle, 00:07 the entire thing, 00:09 in one go. 00:11 So, the problem that I posed to you is, 00:14 make a square with the turtle. 00:16 Well, in your case, 00:17 let's see how you could do exactly that. 00:21 So, let me find the file where we opened up the turtle. 00:23 Let me close that guy right there. 00:25 Copy this line and paste it right there. 00:29 Okay, my turtle has begun. 00:31 Well, the idea is simple. 00:34 I take this line forward, and go 100. 00:38 Now, since sometimes programmers are lazy, 00:40 I don't want to keep writing this over and over again, 00:42 so one thing I can do to make my life easier 00:45 is go to the line that I want to click on, 00:48 I want to use, basically. 00:50 Go to that line, click my mouse there, 00:52 hit 'enter', it brings that down at the bottom, 00:55 as you can see right here. 00:56 And now I can just hit 'enter'. 00:59 So, you can see my turtle just moved left, okay? 01:02 Now it's facing up. 01:05 Now what I want to do is move it forward again, 01:08 and you can see that it's facing up again, 01:11 er, I'm sorry, it's ... 01:13 It moved up, now I need to make it face left. 01:16 So, how do I do that? 01:17 I go left, make it turn 90 degrees, 01:19 and you can see it turned 90 degrees. 01:22 Now I want it to move 100 again. 01:25 You can see it move forward. 01:27 And 90 degrees, and then 100 once again, 01:31 and I have made the square. 01:34 Now, what I want you to be able to do is, 01:38 make a Python file, which means that, 01:41 remember this thing that we opened up right here, 01:45 where we write all of the code at once? 01:48 So, for example, 01:50 I'm gonna close it, 01:51 I'm gonna show you how to open it again, okay? 01:53 So, I'm gonna close this one, 01:54 and I will simply open it again. 01:56 'New file', or 'Command-N'. 01:59 And I will go and put it to the right side, 02:02 just so I have these side by side, 02:05 and I will say something like 'import turtle'. 02:08 Remember that command. 02:09 If you don't use that command 02:11and you try to do 'turtle', 02:12 your program will be like, 02:14 "What the heck is 'turtle'?" 02:16 So, by doing 'import turtle', 02:18 now it knows what 'turtle' is. 02:20 It's like when you're talking about your friends, 02:24 if you talk about your friend John, right? 02:27 Like, let's say you're talking about your friend John 02:29 to your mom, or to your dad, 02:32 and you're like, 02:33 "Dad, this guy blah blah blah", 02:35 you're dad's gonna be like, 02:36 "Who the heck is John?" 02:37 So, you're gonna be like, 02:38 "Oh, yeah, you remember John from my fifth grade class?" 02:43 And then your dad, if you're talking to him, 02:44 he's gonna say, 02:45 "Oh, okay, I know who you're talking about". 02:47 So, 'import' is basically like, 02:50 hey, Python, 02:51 import that turtle that those coders wrote, 02:54 and now we can use it, 02:55 and Python is like, 02:56 "Oh, that turtle", 02:58 but if you don't have this 'import' command here, 03:01Python's gonna be like, 03:02 "What the heck? 03:03 "What turtle are you talking about? 03:04 "You must be out of your mind." 03:06 Anyways. 03:07 We're gonna import this turtle. 03:09 Alright, so now here's what I want you to do. 03:11 I want you to write a script that makes the turtle 03:14 in one single go, okay? 03:18 And I want you to make that square with the turtle 03:21 straight up in one go. 03:22 For example, 03:23 let's come over here to our script that I've written, 03:26 and if I write stuff here, 03:28 it does things immediately, right? 03:30 As you saw, 03:30 but if I come to my right side over here ... 03:34 Oh, by the way, just one quick note. 03:36 Whatever you do, do not name this file 'turtle.py'. 03:40 You can name it 'turtle_game', or 'game', 03:44 or something else, 03:45 just don't name it turtle, 03:47 because then it confuses this turtle here 03:49 with this file, 03:50 and everything goes all over the place. 03:53 So, don't do that, 03:54 'cause I ended up doing that and it caused lots of problems. 03:58 Alright, so let me just show you what happens 04:00 when I run this file. 04:02 I'll go to 'Run', I'll hit 'Run module', 04:04 and hit 'OK'. 04:06 And you can see that my turtle went 04:08 and did all those things in one go. 04:10 How cool is that? 04:11 So you don't have to sit there, type it all in. 04:13 You can just write it in one go, 04:14 and it'll do that every single time. 04:17 So, I want you to work on that square, 04:19 but before you go and do that, 04:21I just want to show you what this file actually looks like. 04:24 So, if I go to, 04:29 let's say, 04:30 'Documents', and 'Clever Programmer', 04:33 'Practice Exercises', 04:35 and we take a look at this file, 'turtle_game', 04:38 it's just a text file with this code in here, okay? 04:42 That's really it, that's all that's going on in here. 04:45 So, I'm gonna 04:47 leave it here. 04:50 The code that you write for the square, 04:52 I want you to either go to the Youtube place, 04:55 Youtube channel, and post it in the comments, 04:58 or I want you to paste your code right here in the comments 05:01on cleverprogrammer.com, okay? 05:03 I'm gonna take a look at it. 05:05 I will see you in the next video.

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