1 00:00:00,420 --> 00:00:01,050 All right. Now, 2 00:00:01,050 --> 00:00:05,460 the first turtle challenge I've got for you is pretty easy. 3 00:00:05,490 --> 00:00:09,060 It's kind of like doing your stretches before we get started with the proper 4 00:00:09,060 --> 00:00:14,040 workout. So in this challenge, you're going to be using turtle to draw a square. 5 00:00:14,400 --> 00:00:17,610 It's going to be a simple 100 by 100 square, 6 00:00:18,060 --> 00:00:19,980 and it doesn't matter where it is on the screen. 7 00:00:20,250 --> 00:00:24,000 As long as you can get it to draw this, then consider yourself successful. 8 00:00:24,600 --> 00:00:27,300 Pause the video, have a read through the documentation, 9 00:00:27,330 --> 00:00:30,510 have a think about the challenge and go ahead and complete it. 10 00:00:34,590 --> 00:00:34,920 All right. 11 00:00:34,920 --> 00:00:38,370 So I'm going to comment out the previous lines of code other than the line where 12 00:00:38,370 --> 00:00:39,960 we created our timmy_ 13 00:00:39,960 --> 00:00:43,890 the_turtle. Now to draw a square is pretty simple. 14 00:00:43,920 --> 00:00:48,240 All we have to do is to get it to go forwards by a hundred paces, 15 00:00:48,570 --> 00:00:52,470 and then we turn left or turn right by 90 degrees. 16 00:00:52,890 --> 00:00:57,890 And then we get it to repeat this process one time for each of the sides. 17 00:00:58,320 --> 00:00:59,760 And when we run the code, 18 00:00:59,820 --> 00:01:04,680 now you can see it draws a simple square. Now, 19 00:01:04,680 --> 00:01:07,410 of course, because we're programmers and we're lazy 20 00:01:07,410 --> 00:01:11,970 and we don't like looking at repeated code, a much simpler way of doing this is 21 00:01:11,970 --> 00:01:13,920 to simply create a for loop. 22 00:01:14,280 --> 00:01:19,280 And we're going to use the range operator to say that this loop should run four 23 00:01:19,830 --> 00:01:23,040 times and then let's indent these two lines of code. 24 00:01:23,490 --> 00:01:26,640 And now it will do exactly the same as before 25 00:01:26,940 --> 00:01:31,140 but this time we've only had to write three lines of code instead of a million. 26 00:01:31,350 --> 00:01:33,720 This is probably the best solution, 27 00:01:33,810 --> 00:01:38,340 but I will also take this solution because after all, 28 00:01:38,370 --> 00:01:42,240 we're just doing the warmup right? Now, while doing that exercise 29 00:01:42,270 --> 00:01:46,260 you might have realized that it's actually really painful to keep calling our 30 00:01:46,260 --> 00:01:49,590 object timmy_the_turtle with such a long name. 31 00:01:50,100 --> 00:01:52,710 But now that we've written it in so many lines 32 00:01:52,770 --> 00:01:55,020 especially if you created this version of the code, 33 00:01:55,410 --> 00:01:58,920 it's actually quite painful to go through each of them and change its name. 34 00:01:59,400 --> 00:02:00,840 Remember in PyCharm 35 00:02:00,840 --> 00:02:05,370 we have a really simple way of changing the name of a variable or a function, 36 00:02:05,550 --> 00:02:09,840 basically anything that we've named ourselves. All we have to do is right- 37 00:02:09,840 --> 00:02:12,300 click on the name, refactor and rename, 38 00:02:12,630 --> 00:02:17,100 and we can change it to something really simple like how about Tim. Now 39 00:02:17,100 --> 00:02:21,600 we've drastically made our code look a lot simpler just by doing that one thing. 40 00:02:22,500 --> 00:02:25,440 I'll try to remind you of some of these shortcuts as we go along, 41 00:02:25,860 --> 00:02:28,530 but once you're ready, head over to the next challenge.