1 00:00:01,130 --> 00:00:07,110 This is the last lecture in this section, and I wanted to touch on a few issues, it has to do with 2 00:00:07,110 --> 00:00:12,210 differences between you both and my proposal raise and see Python. 3 00:00:12,640 --> 00:00:15,660 Obviously, those two languages are very, very close to each other. 4 00:00:15,660 --> 00:00:22,440 But they're not identical in this because micro python has to make certain compromises because it is 5 00:00:22,440 --> 00:00:26,140 operating on platforms with very limited resources. 6 00:00:26,730 --> 00:00:33,480 So I'm going to show you a couple of examples where those differences actually manifested in the come 7 00:00:33,480 --> 00:00:33,900 out. 8 00:00:34,170 --> 00:00:39,160 And I also invite you to take a little bit of time to do the reading. 9 00:00:39,510 --> 00:00:45,690 So in the micro python documentation, you'll find a whole section dedicated to the differences between 10 00:00:45,930 --> 00:00:52,020 micro python and C Python and just maybe take your time to browse through them. 11 00:00:52,050 --> 00:00:57,990 I'm only going to show you a couple of indicative examples that can often confuse people, especially 12 00:00:57,990 --> 00:00:58,980 the second example. 13 00:00:59,250 --> 00:01:03,090 And the first example that I'm going to show you has to do with spaces. 14 00:01:03,450 --> 00:01:11,160 So because my python is optimized for speed and again can optimize to operate on platforms with limited 15 00:01:11,160 --> 00:01:17,970 resources, is not very forgiving to typing errors that Python can forgive. 16 00:01:18,450 --> 00:01:23,670 So one of those is spaces I'm going to show you live. 17 00:01:24,300 --> 00:01:32,460 So I've got Sony on the left side that is running Python three point seven point nine, which comes 18 00:01:32,460 --> 00:01:34,940 with the only instance that I'm using. 19 00:01:35,280 --> 00:01:41,160 And on the other side, I've got a serial connection to my especially to running my python. 20 00:01:41,640 --> 00:01:49,650 So I'm going to run a little bit of code here to see one example of the differences between the two 21 00:01:49,650 --> 00:01:58,500 types of python in Python, three point o if you do something such as one and zero. 22 00:01:58,550 --> 00:02:01,740 So what I'm doing here is a boolean operation. 23 00:02:02,520 --> 00:02:08,030 I'm using the end keyword to do a boolean comparison between one and zero. 24 00:02:08,520 --> 00:02:11,840 And Python has no problem with that. 25 00:02:11,850 --> 00:02:16,070 It's going to evaluate it and give us a correct result. 26 00:02:16,800 --> 00:02:23,000 So do the same thing on micro Python will get in there a message. 27 00:02:23,580 --> 00:02:29,090 So we're going to work unless it's perfectly syntax like this and then it will work. 28 00:02:29,550 --> 00:02:34,650 So Spaces is treated differently between Python and micro python. 29 00:02:34,660 --> 00:02:41,460 And there's an example here in this section is very well written and shows you how each of those differences 30 00:02:41,460 --> 00:02:43,740 manifest on the two different platforms. 31 00:02:44,190 --> 00:02:47,280 So next, I want to show you a more substantial difference between the two. 32 00:02:47,280 --> 00:02:54,150 And that brings us back to the previous lecture where you learnt about classes and objects to what to 33 00:02:54,150 --> 00:03:04,050 do is I'm going to create a class definition, which you learned about in the previous lecture. 34 00:03:04,410 --> 00:03:08,440 And here it is on C Python, two point seven point nine. 35 00:03:08,450 --> 00:03:15,390 And I'm going to do the same thing on the E.S.P three two side running micro python that I'm going to 36 00:03:15,390 --> 00:03:17,730 have to copy this one line at a time. 37 00:03:17,740 --> 00:03:18,870 So bear with me here. 38 00:03:29,230 --> 00:03:37,480 OK, so there's my calculator class on Micro Python so we can use the two classes in the exact same 39 00:03:37,480 --> 00:03:42,480 way and create an instance first and both sides, no problem. 40 00:03:42,740 --> 00:03:44,050 Let's do it in addition. 41 00:03:47,780 --> 00:03:50,510 And it works the same each way. 42 00:03:50,960 --> 00:04:00,560 Now, let's go ahead now and create a new instance of the calculator class at this time, pass an incorrect 43 00:04:00,560 --> 00:04:02,780 number of parameters. 44 00:04:03,780 --> 00:04:08,370 So there's calculator with a single parameter on one side. 45 00:04:09,360 --> 00:04:11,030 I'm going to do the same thing on the other side. 46 00:04:12,650 --> 00:04:20,870 All right, so let's now look at the traceback information that comes from the Python interpreter to 47 00:04:20,870 --> 00:04:28,700 see, Python is telling me that there is one missing required positional argument telling me that number 48 00:04:28,700 --> 00:04:30,060 two is missing. 49 00:04:30,530 --> 00:04:32,590 So quite a lot of information here. 50 00:04:33,680 --> 00:04:39,710 One requite position of primary is missing them to no one has been provided on the other side through 51 00:04:40,910 --> 00:04:41,380 micro. 52 00:04:41,390 --> 00:04:45,230 Python is telling me that there are three positional arguments. 53 00:04:45,260 --> 00:04:47,120 Only two were given. 54 00:04:47,120 --> 00:04:49,280 In fact, I only gave you one. 55 00:04:49,790 --> 00:04:55,700 If you look at actually what you did, just one parameter was given my code. 56 00:04:55,730 --> 00:05:00,560 Python is telling me that I've given two parameters and there are three or not. 57 00:05:00,830 --> 00:05:08,360 And this is because it is counting self as a parameter so that if we got one, two, three parameter 58 00:05:08,360 --> 00:05:16,480 squares in C Python, it's ignoring self and it knows that there are two parameters that have been provided 59 00:05:16,490 --> 00:05:18,770 and it even tells you which parameter it's missing. 60 00:05:19,190 --> 00:05:24,400 So the interpreter obviously has got more capability on C Python. 61 00:05:24,770 --> 00:05:31,940 It gives you more precise feedback and information that helps you with debugging and it gives you a 62 00:05:31,940 --> 00:05:40,100 correct number of arguments for, in this case, the Init function compared to what Microplace and does. 63 00:05:40,370 --> 00:05:45,800 Now, this is basically for people that are coming from see, Python can be very confusing because they 64 00:05:45,800 --> 00:05:51,970 are used to take accurate information from the C Python interpreter. 65 00:05:52,340 --> 00:05:58,940 And the difference in the numbers here can easily throw people off until you realize that this difference 66 00:05:58,940 --> 00:05:59,870 does exist. 67 00:06:00,800 --> 00:06:08,060 So anyway, I do recommend that you spend a little bit of time to have a look at the information provided 68 00:06:08,300 --> 00:06:11,060 by the micro python documentation. 69 00:06:12,230 --> 00:06:19,520 And that will really prepare you, Bill, to be able to work with local python in the remainder of this 70 00:06:19,520 --> 00:06:19,910 course.