0 1 00:00:04,560 --> 00:00:05,800 Hello again, in previous lectures 1 2 00:00:05,800 --> 00:00:06,853 we displayed our statistics. 2 3 00:00:08,464 --> 00:00:10,046 It's here. 3 4 00:00:10,046 --> 00:00:12,033 In this lecture what I want to do, 4 5 00:00:12,033 --> 00:00:14,143 when I add new book. 5 6 00:00:15,100 --> 00:00:17,586 Lets say, new book. 6 7 00:00:17,586 --> 00:00:18,720 Add book. 7 8 00:00:18,720 --> 00:00:20,240 (digital chime) 8 9 00:00:20,240 --> 00:00:23,460 Now my book, I can't display it here, 9 10 00:00:23,460 --> 00:00:25,180 but if I go to statistic, as you see 10 11 00:00:25,180 --> 00:00:27,540 it was 10 now it's 11. 11 12 00:00:27,540 --> 00:00:29,900 And also I want to display my book, 12 13 00:00:29,900 --> 00:00:31,650 at my list. 13 14 00:00:31,650 --> 00:00:33,010 How can I do that? 14 15 00:00:33,010 --> 00:00:36,383 To do that, actually there are some ways to do that. 15 16 00:00:37,760 --> 00:00:39,720 The first way we already used, 16 17 00:00:39,720 --> 00:00:42,210 it is notebook tab changed. 17 18 00:00:42,210 --> 00:00:45,720 And also, I can use another function, 18 19 00:00:45,720 --> 00:00:46,553 let me show you. 19 20 00:00:46,553 --> 00:00:47,386 Self dot 20 21 00:00:49,430 --> 00:00:51,000 tabs 21 22 00:00:51,000 --> 00:00:51,833 dot 22 23 00:00:51,833 --> 00:00:53,380 bind method again. 23 24 00:00:53,380 --> 00:00:55,000 And here I can say 24 25 00:00:56,270 --> 00:00:57,103 button 25 26 00:00:58,620 --> 00:01:00,110 release 26 27 00:01:00,110 --> 00:01:01,190 dash 27 28 00:01:01,190 --> 00:01:02,440 one 28 29 00:01:02,440 --> 00:01:05,720 and here I can say display book. 29 30 00:01:07,812 --> 00:01:10,410 (keyboard strokes) 30 31 00:01:10,410 --> 00:01:12,810 Display books. 31 32 00:01:12,810 --> 00:01:15,730 Okay, this is the second way I can do that, 32 33 00:01:15,730 --> 00:01:17,273 for my display books. 33 34 00:01:20,430 --> 00:01:24,437 But here you might think why we cannot use 34 35 00:01:24,437 --> 00:01:26,483 this function for both, 35 36 00:01:27,630 --> 00:01:29,770 notebook tab changed bind method, 36 37 00:01:29,770 --> 00:01:31,010 for both function. 37 38 00:01:31,010 --> 00:01:32,380 Actually we cannot do that 38 39 00:01:32,380 --> 00:01:35,980 and also I will not use this function too. 39 40 00:01:35,980 --> 00:01:39,160 Because the recommended way is only creating 40 41 00:01:39,160 --> 00:01:41,300 one function, instead of display books 41 42 00:01:41,300 --> 00:01:43,668 and display status, okay. 42 43 00:01:43,668 --> 00:01:46,110 We can create only one function, for example 43 44 00:01:46,110 --> 00:01:48,010 the functioning can be display 44 45 00:01:48,010 --> 00:01:52,770 and the old display function can contain everything 45 46 00:01:52,770 --> 00:01:56,120 from display books and also display statistics. 46 47 00:01:56,120 --> 00:01:59,030 This is the best way and recommended way we should do that. 47 48 00:01:59,030 --> 00:02:01,590 Or second way we can do that for our display book. 48 49 00:02:01,590 --> 00:02:04,380 And the last one we can come here 49 50 00:02:04,380 --> 00:02:07,903 and call our display books function. 50 51 00:02:10,000 --> 00:02:13,100 Also this will solve our problem. 51 52 00:02:13,100 --> 00:02:15,040 This way it looks easier 52 53 00:02:15,040 --> 00:02:16,910 but actually if you have many functions 53 54 00:02:16,910 --> 00:02:18,500 this way is not easier way, okay. 54 55 00:02:18,500 --> 00:02:20,430 This way is not Pythonic way. 55 56 00:02:20,430 --> 00:02:23,680 But in this case I will do that, okay. 56 57 00:02:23,680 --> 00:02:27,370 But as I said I recommend creating one function, 57 58 00:02:27,370 --> 00:02:30,170 instead of these two functions. 58 59 00:02:30,170 --> 00:02:33,550 And we can call here, the function, 59 60 00:02:33,550 --> 00:02:36,730 notebook tab changed and we will solve all the problems. 60 61 00:02:36,730 --> 00:02:40,170 For example if you have 10, or more than 10 functions, 61 62 00:02:40,170 --> 00:02:42,670 we should use this way, okay. 62 63 00:02:42,670 --> 00:02:44,270 Notebook, tab self bind. 63 64 00:02:44,270 --> 00:02:46,330 Notebook tab changed, okay. 64 65 00:02:46,330 --> 00:02:50,150 And after that, here let me run our application, 65 66 00:02:50,150 --> 00:02:52,680 and see everything works or not. 66 67 00:02:52,680 --> 00:02:54,713 Now, so here I have 11 books. 67 68 00:02:55,600 --> 00:02:57,630 And if I add new one. 68 69 00:02:57,630 --> 00:02:58,463 Add book. 69 70 00:02:58,463 --> 00:02:59,296 (digital chime) 70 71 00:02:59,296 --> 00:03:00,963 Now 11 it was. 71 72 00:03:00,963 --> 00:03:02,370 12, right? 72 73 00:03:02,370 --> 00:03:04,550 But if I go back to here, you see now 73 74 00:03:04,550 --> 00:03:06,460 here there is another problem. 74 75 00:03:06,460 --> 00:03:09,610 Now we have 10, 11, 12, it's here. 75 76 00:03:09,610 --> 00:03:12,230 But again we have 11 books here, 76 77 00:03:12,230 --> 00:03:14,540 so how can I solve this problem? 77 78 00:03:14,540 --> 00:03:16,850 To do that I need to come here, 78 79 00:03:16,850 --> 00:03:18,100 and display books. 79 80 00:03:18,100 --> 00:03:20,380 Before for loop. 80 81 00:03:20,380 --> 00:03:22,300 Before for loop, what I need to, 81 82 00:03:22,300 --> 00:03:25,440 I need to delete old values from my list. 82 83 00:03:25,440 --> 00:03:27,730 Self dot list books 83 84 00:03:28,670 --> 00:03:30,490 dot delete, okay. 84 85 00:03:30,490 --> 00:03:35,490 And I will say, from first character until end, okay. 85 86 00:03:35,660 --> 00:03:37,993 And now, if I run it again. 86 87 00:03:40,700 --> 00:03:42,420 Now we have 12. 87 88 00:03:42,420 --> 00:03:44,130 So if I add new one: 88 89 00:03:44,130 --> 00:03:45,692 add book, and- 89 90 00:03:45,692 --> 00:03:46,860 (digital chime) 90 91 00:03:46,860 --> 00:03:47,693 Okay. 91 92 00:03:47,693 --> 00:03:50,640 Now if I go back to statistics, 92 93 00:03:50,640 --> 00:03:52,530 13 books in library. 93 94 00:03:52,530 --> 00:03:53,363 Great. 94 95 00:03:53,363 --> 00:03:55,230 So if I come back to here, as you see now, 95 96 00:03:56,220 --> 00:03:58,180 the last book is also here. 96 97 00:03:58,180 --> 00:04:01,080 This is how we can update our list box. 97 98 00:04:01,080 --> 00:04:01,913 For now, that's all. 98 99 00:04:01,913 --> 00:04:02,973 See you in the next.