1
00:00:00,570 --> 00:00:11,370
Hello and welcome to the 3 and the concluding part to the feed you on this project for creatine a weight

2
00:00:11,400 --> 00:00:14,550
conversion tool in this part.

3
00:00:14,550 --> 00:00:20,610
We are going to create the function that will do the calculation.

4
00:00:20,610 --> 00:00:28,340
So we're going to define the function right at the top of the document here.

5
00:00:28,410 --> 00:00:34,800
Edit Or just underneath this module here is where I will define the function.

6
00:00:34,800 --> 00:00:39,680
So we call the function you define it function by typing in the keyword.

7
00:00:39,750 --> 00:00:41,870
Def followed by the name.

8
00:00:41,860 --> 00:00:43,860
So I'm gonna call it calculate

9
00:00:46,890 --> 00:00:57,610
and inside the argument of the function I'm going to pass it this value.

10
00:00:58,830 --> 00:01:03,340
You use this when you're not sure the number of arguments you're gonna pass through.

11
00:01:03,930 --> 00:01:08,170
So this represents the arguments that will pass through that function.

12
00:01:09,480 --> 00:01:17,700
And when you create a function after the parentheses you put a call on there and then now we'll start

13
00:01:17,790 --> 00:01:22,490
to define the logic for the function to save time.

14
00:01:22,550 --> 00:01:25,340
I've added the logic here.

15
00:01:25,350 --> 00:01:32,610
I'm just going to explain what the bot the bunch of code I've added here means.

16
00:01:32,640 --> 00:01:44,430
So here are defined a calculate procedure which is called either when the user presses the calculate

17
00:01:44,430 --> 00:01:56,790
button or hits the return or enter key what it will to do it will perform the feat to meet his calculation

18
00:01:57,720 --> 00:02:07,620
in the number of feet from our Entry widget and placing the result in our label widget we specified

19
00:02:07,710 --> 00:02:13,440
a tax variable options when we created the widget.

20
00:02:13,650 --> 00:02:21,720
So we the we specified that the global fit variable is variable.

21
00:02:21,720 --> 00:02:26,370
Here we define the variable code feet or meters.

22
00:02:26,520 --> 00:02:27,510
We are global.

23
00:02:27,510 --> 00:02:29,730
So here.

24
00:02:29,730 --> 00:02:34,530
So we defined here you see the global feed variable here.

25
00:02:34,560 --> 00:02:41,090
We are using that here as a text variable here is where we define the global feed variables.

26
00:02:41,090 --> 00:02:42,860
We're using that.

27
00:02:43,300 --> 00:02:45,540
We're using that as the N3.

28
00:02:45,540 --> 00:02:50,150
So that's will be where they'll enter the value in Ft.

29
00:02:50,160 --> 00:02:59,640
So which means at any time this entry changes T.K. will automatically update the global variable code

30
00:02:59,780 --> 00:03:00,320
feet.

31
00:03:00,330 --> 00:03:12,750
Similarly if we explicitly change the value of the text variable that is associated with a widget the

32
00:03:12,750 --> 00:03:19,040
widget will automatically be updated with the current contents of the variable.

33
00:03:19,050 --> 00:03:27,380
So we're also doing the same for the meters global variable which is here.

34
00:03:27,390 --> 00:03:35,550
We're so attached to this label here called text variable meta so the same applies to that.

35
00:03:35,580 --> 00:03:42,910
So here also we've implemented some error handling with the try and accept statements.

36
00:03:43,260 --> 00:03:52,330
So whenever you implement error handling you need to implement a try and an accept statement.

37
00:03:52,470 --> 00:03:58,690
So in the try block here we've got the get method which will get the value in Ft.

38
00:03:58,710 --> 00:04:01,900
And here is this is what gets a conversion.

39
00:04:01,970 --> 00:04:05,940
We're using the set method to set the value in meters.

40
00:04:06,100 --> 00:04:07,430
And this is what he does it.

41
00:04:07,440 --> 00:04:11,070
This is how it does a calculation based on this.

42
00:04:11,070 --> 00:04:22,320
So if we multiply this this by the value that is entered and multiply that by this and add this and

43
00:04:22,320 --> 00:04:28,850
divide by that that will give you the conversion in meters.

44
00:04:29,130 --> 00:04:34,310
And here this is any error that occurs it will capture the arrow there.

45
00:04:34,330 --> 00:04:38,490
Okay so that is basically the application.

46
00:04:38,490 --> 00:04:49,410
And here again this is I've already spoken about this but this here is this tells T.K. to enter its

47
00:04:49,500 --> 00:04:50,990
event loop.

48
00:04:51,000 --> 00:04:54,130
This is needed to make everything wrong.

49
00:04:54,130 --> 00:05:02,490
So this is what keeps the application running by the event looping so let me save that and then we can

50
00:05:02,490 --> 00:05:06,620
test and run our application make sure.

51
00:05:08,700 --> 00:05:13,900
Make sure you format your code properly.

52
00:05:14,220 --> 00:05:16,410
If not the editor would complain.

53
00:05:16,410 --> 00:05:19,140
You can see I've got my code structures.

54
00:05:19,170 --> 00:05:25,440
Make sure you've got yours completely structured the same way if not eat or complain someone would click

55
00:05:25,440 --> 00:05:32,700
on save and run the application by going on run and clicking on run module.

56
00:05:34,060 --> 00:05:34,660
Okay.

57
00:05:34,700 --> 00:05:37,420
So this is our application here.

58
00:05:37,530 --> 00:05:44,540
I'm just going to type in a value say see a 56 click calculate.

59
00:05:44,540 --> 00:05:47,550
I can see this is the equivalent in meters.

60
00:05:47,550 --> 00:05:51,750
So the application is working as designed.

61
00:05:51,900 --> 00:05:54,000
So that's it for this project.

62
00:05:54,000 --> 00:05:55,880
Thanks for watching and bye for now.