1 00:00:00,820 --> 00:00:07,290 For this lecture, I'd like you to go to the resources of this lecture and download the three text files. 2 00:00:07,980 --> 00:00:13,050 Then in the Explorer here in your IDE, create a new folder. 3 00:00:15,270 --> 00:00:21,360 Give it a name such as quotes and then put those three files in that quotes folder. 4 00:00:22,260 --> 00:00:23,910 You can use drag and drop if you like. 5 00:00:24,150 --> 00:00:30,600 For example, I have this files somewhere and I'm going to just drag and drop them in this folder. 6 00:00:31,770 --> 00:00:35,040 So you see, that's now the files are in the quotes folder. 7 00:00:36,570 --> 00:00:41,310 So what we are going to do in this lecture is in the program that we have. 8 00:00:46,320 --> 00:00:51,240 We are going to write one of these three supported feelings for now. 9 00:00:51,510 --> 00:00:54,210 You can add more files later if you have some data. 10 00:00:54,810 --> 00:00:57,900 But this is what we have so far. 11 00:00:58,230 --> 00:01:06,720 And so when the user presses the "Enlighten me" button, we want to show one of the quotes that are inside 12 00:01:06,720 --> 00:01:09,030 the happy.txt file. 13 00:01:10,570 --> 00:01:12,700 So one of these lines. 14 00:01:14,710 --> 00:01:15,740 Some are long. 15 00:01:15,910 --> 00:01:16,810 Some are shorter. 16 00:01:20,420 --> 00:01:26,070 And so if the user enters sad, then you want to display here. 17 00:01:27,410 --> 00:01:33,890 In this area, one of the lines all of the sad.txt file, those are also our quotes. 18 00:01:35,600 --> 00:01:36,650 And so you get the idea. 19 00:01:37,250 --> 00:01:45,770 And if the user and there's an unknown feeling such as, let's say, excited, and when they press the 20 00:01:45,770 --> 00:01:48,130 button, you want to show: "Try another feeling". 21 00:01:48,290 --> 00:01:51,040 Because you cannot have all possible feelings 22 00:01:51,050 --> 00:01:52,050 covered. 23 00:01:52,370 --> 00:01:54,620 So this is what we are going to do in this lecture. 24 00:01:59,340 --> 00:01:59,530 Main.py. 25 00:01:59,900 --> 00:02:00,480 So 26 00:02:01,340 --> 00:02:03,620 let's start from the button. 27 00:02:03,710 --> 00:02:09,920 Try to locate the "Enlighten me" button, or at least that's how my button is called. 28 00:02:10,190 --> 00:02:14,960 So Button, that button is part of the LoginScreenSuccess page. 29 00:02:15,770 --> 00:02:19,400 And we don't have an on_press attributes yet. 30 00:02:20,030 --> 00:02:21,620 So on_press, what do you want to do? 31 00:02:21,620 --> 00:02:24,320 You want to execute a method 32 00:02:27,360 --> 00:02:35,170 f the logging screen success class which I have it right here, so that logging screen success, it 33 00:02:35,170 --> 00:02:41,250 already has a method logout which is executed when this button is pressed, the logout button. 34 00:02:42,100 --> 00:02:49,840 Now we want to implement the get quote method. Quote(self) as usual. 35 00:02:50,290 --> 00:02:57,490 And so this method now has to communicate the value that the user entered in the text input. 36 00:02:57,790 --> 00:03:00,600 So which is route.ids. 37 00:03:00,700 --> 00:03:04,450 We don't have an idea for text input. 38 00:03:04,450 --> 00:03:06,880 So let's put an ID. 39 00:03:07,720 --> 00:03:10,470 So this is a text input where the user enters the feeling. 40 00:03:10,990 --> 00:03:13,620 And so let's put feeling there. 41 00:03:14,020 --> 00:03:19,570 Ids.feeling, we want to get the text of that text input. 42 00:03:19,930 --> 00:03:21,680 So that feeling will go 43 00:03:21,700 --> 00:03:22,210 here. 44 00:03:24,760 --> 00:03:29,290 Let's just call it feel not to be confused with that feeling word. 45 00:03:30,070 --> 00:03:37,180 And the first thing we might want to do is let's see if we are accessing the feeling texts correctly. 46 00:03:37,870 --> 00:03:44,000 So print feel. Make sure you save the 47 00:03:45,090 --> 00:03:49,350 designe.kv file execute, login. 48 00:03:49,480 --> 00:03:55,510 I was able to log in because I have this username I created earlier when I signed up. 49 00:03:56,260 --> 00:04:00,370 I created one username, which is an empty string and empty string for the password. 50 00:04:00,670 --> 00:04:05,050 So basically it's a user with empty string empty strung as username and password, which works because 51 00:04:05,050 --> 00:04:09,130 I haven't put any jurisdictions or the username and password. 52 00:04:10,130 --> 00:04:14,840 So this is just for simplicity when you try and when you test the application. 53 00:04:15,500 --> 00:04:16,010 Happy. 54 00:04:16,100 --> 00:04:16,970 Enlighten me. 55 00:04:17,050 --> 00:04:18,260 And so we get the happy 56 00:04:19,970 --> 00:04:20,660 string there. 57 00:04:21,080 --> 00:04:26,030 And if that is with a H, you're going to get "Happy". 58 00:04:26,600 --> 00:04:34,610 So the first thing we might want to do is to change the feel into lower case. 59 00:04:34,970 --> 00:04:43,080 So even if the user enters happy with a capital H, we are going to convert that to all lower case 60 00:04:44,720 --> 00:04:50,210 so that we can compare now with the names in the text files, with the file names. 61 00:04:50,660 --> 00:04:52,040 So let's now see what's 62 00:04:55,400 --> 00:04:56,600 available, feelings we have. 63 00:04:56,990 --> 00:05:10,550 So I'm assigning a variable available_feelings and I'm going to use a globe module to get a list of file 64 00:05:10,550 --> 00:05:11,030 names. 65 00:05:15,970 --> 00:05:17,890 This is what this is going to give me 66 00:05:21,340 --> 00:05:24,590 an error, of course, because I didn't import Globe. 67 00:05:31,550 --> 00:05:34,940 So it gives you a list with all the files. 68 00:05:35,780 --> 00:05:38,570 This is available, all the available feelings. 69 00:05:40,560 --> 00:05:45,920 So we are here in the get_quote methods. Now the available feelings list 70 00:05:45,990 --> 00:05:48,770 now looks like a list of file paths. 71 00:05:49,320 --> 00:05:54,720 What I want to do is I want to extract only the names of these files. 72 00:05:55,290 --> 00:05:56,640 Only the sad part. 73 00:05:57,470 --> 00:06:01,650 A way to do that is by using 74 00:06:05,220 --> 00:06:07,770 the path object of the pathlib library. 75 00:06:07,800 --> 00:06:09,270 You don't have to install this library. 76 00:06:09,750 --> 00:06:10,770 It comes with Python. 77 00:06:10,920 --> 00:06:13,470 It's standard library using path. 78 00:06:13,590 --> 00:06:24,000 If you give path a path such as quotes/sad.txt and then extract the stem out of that, it will give 79 00:06:24,000 --> 00:06:30,210 you the name of the file without the extension, without the other part of the path. 80 00:06:32,040 --> 00:06:37,320 In fact, you have many methods of path, and stem is one of them. 81 00:06:37,590 --> 00:06:39,330 So you can get the suffix. 82 00:06:39,660 --> 00:06:42,450 The name of the file, including the extension. 83 00:06:45,990 --> 00:06:55,410 Such as that and so on, and so what we can do here now is we need to make use of that stem property 84 00:06:55,890 --> 00:06:59,460 and we need to apply that to all the file names. 85 00:07:00,130 --> 00:07:02,940 Well, to do that, so you can use a list comprehension. 86 00:07:03,440 --> 00:07:07,050 So available_feelings equal to path, 87 00:07:08,220 --> 00:07:15,030 let's say file name for file name in available_feelings. 88 00:07:16,600 --> 00:07:21,770 And here I would like to split the line into multiple lines. 89 00:07:24,290 --> 00:07:26,150 Since this is inside square brackets, 90 00:07:26,180 --> 00:07:27,710 I am allowed to split the line. 91 00:07:28,490 --> 00:07:31,460 And so we wanted the stem out of that. 92 00:07:34,640 --> 00:07:40,810 And then we might want to try a print in here off available feelings. 93 00:07:41,230 --> 00:07:51,610 Also make sure to import from pathlib import path and then execute the app. 94 00:07:57,640 --> 00:08:01,960 And I got an error when I pressed the bottom, string object has no attributes. 95 00:08:02,120 --> 00:08:06,710 Yeah, of course, because I did in here instead of putting stem 96 00:08:06,730 --> 00:08:11,060 after the path object, I put it just next to the file name. 97 00:08:11,180 --> 00:08:11,740 File name 98 00:08:11,750 --> 00:08:12,460 is a strig. 99 00:08:12,950 --> 00:08:14,940 So that's why you get: 100 00:08:14,960 --> 00:08:16,550 "str" has no stem. 101 00:08:17,660 --> 00:08:20,570 So let's put it in here and try again. 102 00:08:22,790 --> 00:08:23,450 Enlighten me. 103 00:08:23,840 --> 00:08:25,130 So happy said unlove. 104 00:08:25,190 --> 00:08:26,180 That's what we want. 105 00:08:26,240 --> 00:08:29,690 Now we have of the available feelings in a list. 106 00:08:33,300 --> 00:08:40,710 What can I do now? I can say if feel in available_feelings. 107 00:08:43,640 --> 00:08:47,750 So if that feeling is in the available_feelings, 108 00:08:50,490 --> 00:08:57,420 then what we want to do next is we want to open that file that has that feeling, that has the quote 109 00:08:57,720 --> 00:08:58,740 for that feeling. 110 00:08:59,220 --> 00:09:00,540 So let's use an open. 111 00:09:00,960 --> 00:09:02,760 I'm going to use string formatting here. 112 00:09:04,350 --> 00:09:14,820 So quotes, I'm going to open this file path, which has this feel.txt as file. 113 00:09:16,080 --> 00:09:17,610 So what am I doing here? 114 00:09:17,670 --> 00:09:24,420 Well, that thing what that is going to give me is let's say the feel that the user entered was happy. 115 00:09:24,900 --> 00:09:25,200 Right. 116 00:09:25,590 --> 00:09:27,510 So we get that valuable. 117 00:09:27,600 --> 00:09:28,800 We had it has a value. 118 00:09:29,250 --> 00:09:33,070 And if we get now this string 119 00:09:36,620 --> 00:09:41,150 what is going to give us is the file path for that feeling. 120 00:09:41,570 --> 00:09:50,600 So this expression here in these braces is going to be replaced with the value of the variable of the 121 00:09:50,600 --> 00:09:51,830 feel variable. 122 00:09:53,030 --> 00:09:55,760 So I hope that it's clear. 123 00:09:56,270 --> 00:10:04,310 And then we want to get all the quotes, all that file using the readlines method. 124 00:10:05,840 --> 00:10:08,990 So that will give us a list of all the quotes. 125 00:10:09,920 --> 00:10:16,500 So let me unindent and print the quotes to see what we've got this far. 126 00:10:18,260 --> 00:10:18,620 Happy. 127 00:10:18,620 --> 00:10:19,580 The quotes for happy. 128 00:10:19,940 --> 00:10:21,320 And this is a list. 129 00:10:21,500 --> 00:10:25,030 So as I told you, "Happiness is what you think and what you say". 130 00:10:25,070 --> 00:10:28,760 And so one and then it was told by 131 00:10:30,870 --> 00:10:31,870 Mahatma Gandhi. 132 00:10:32,400 --> 00:10:40,020 And then you have a coma and there is where the other quote starts. So one, we have a list of multiple 133 00:10:40,260 --> 00:10:40,980 strings. 134 00:10:42,330 --> 00:10:44,070 Each string representing a quote. 135 00:10:44,430 --> 00:10:46,560 So what can we do with these quotes now? 136 00:10:49,220 --> 00:10:58,820 What we can do is we can get the self.ids dot the ID of this label where we want to show 137 00:10:58,820 --> 00:11:02,540 the quote, which is just under the "Enlighten me" button. 138 00:11:03,620 --> 00:11:16,430 So the ID quote, quote. Quote.text, so the text of that label will be a random choice 139 00:11:17,780 --> 00:11:17,960 of 140 00:11:18,530 --> 00:11:20,120 the quotes list. 141 00:11:20,690 --> 00:11:22,640 So what does this method do? 142 00:11:22,820 --> 00:11:23,150 Is 143 00:11:27,440 --> 00:11:29,900 it gets a list as input. 144 00:11:31,260 --> 00:11:34,010 So one, two, three. 145 00:11:34,820 --> 00:11:38,660 And it returns a random item out of that list. 146 00:11:38,730 --> 00:11:42,890 Anytime you execute it. Say just pure random. 147 00:11:45,060 --> 00:11:52,170 So, therefore, we're going to get one of these strings, one of these quotes, and that quote is going 148 00:11:52,170 --> 00:11:55,110 to be set as the text of the label. 149 00:11:56,820 --> 00:11:57,750 So that's how it works. 150 00:11:58,380 --> 00:12:00,960 And let's make sure we import 151 00:12:03,660 --> 00:12:04,200 random. 152 00:12:05,820 --> 00:12:09,240 And we are ready to execute the app. 153 00:12:13,010 --> 00:12:13,520 Login. 154 00:12:13,940 --> 00:12:15,790 Happy, enlighten me. 155 00:12:18,580 --> 00:12:25,170 And we got this error, which is a quite common attribute error, 'super' has no attribute 156 00:12:25,280 --> 00:12:25,640 __getattri__. 157 00:12:26,200 --> 00:12:33,760 This happens when the Python file doesn't that ID, the quotes ID in this case. 158 00:12:35,620 --> 00:12:38,950 So you can see that the error happened in line 61. 159 00:12:39,370 --> 00:12:42,370 So that line in there is not working well. 160 00:12:42,970 --> 00:12:50,800 That is, I think because I didn't save the kivy file when I entered, when I updated the ID of the label 161 00:12:50,800 --> 00:12:51,070 here. 162 00:12:51,400 --> 00:12:53,890 So I wrote an ID, but I didn't save the kv file. 163 00:12:55,390 --> 00:12:56,410 So let me try again. 164 00:12:59,440 --> 00:13:03,130 I'm happy these errors emerge because you learn how to fix them. 165 00:13:04,900 --> 00:13:05,850 Enlighten me, and yeah. 166 00:13:06,600 --> 00:13:08,710 So we get the label displayed in here. 167 00:13:10,250 --> 00:13:16,760 When you press again, that random.choice function is going to get another random choice 168 00:13:16,760 --> 00:13:17,690 out of the list. 169 00:13:20,270 --> 00:13:27,410 Sometimes I suppose it may display the same quote, which is fine I think but there are ways to make 170 00:13:27,410 --> 00:13:30,140 it display a different quote from the previous one. 171 00:13:30,770 --> 00:13:32,660 But this is working quite good I think. 172 00:13:32,670 --> 00:13:37,370 Except of the case when 173 00:13:38,640 --> 00:13:44,190 there is a long quote, and it's out of the borders of the app window. 174 00:13:44,820 --> 00:13:51,480 So this is a problem, but nothing to worry about because we are going to implement a scroll view later 175 00:13:51,480 --> 00:13:56,060 on, which will squeeze this label and it will make it flexible. 176 00:13:57,740 --> 00:14:03,150 By resizing the label, depending on the widget on the app size. 177 00:14:03,440 --> 00:14:10,820 For now, let me let me close that and finish the if else block, 178 00:14:10,820 --> 00:14:11,640 so the ids.quote. 179 00:14:11,730 --> 00:14:12,410 text equals to 180 00:14:12,750 --> 00:14:15,530 "Try another 181 00:14:18,630 --> 00:14:19,230 feeling". 182 00:14:21,200 --> 00:14:25,490 So let me try one more time, and we are done with this video. 183 00:14:26,910 --> 00:14:27,960 So that is working. 184 00:14:28,860 --> 00:14:30,040 That is also working. 185 00:14:33,850 --> 00:14:35,440 And I feel pretty. 186 00:14:35,590 --> 00:14:36,380 Try another feeling. 187 00:14:36,550 --> 00:14:37,630 We don't support that. 188 00:14:38,500 --> 00:14:43,600 And this is how we make an app that picks a quote randomly. 189 00:14:43,840 --> 00:14:46,810 So the functionality of the program is pretty much done. 190 00:14:47,110 --> 00:14:53,980 What's left to do is we need to make it a bit pretty, the interface and the buttons, and the spaces 191 00:14:53,980 --> 00:14:56,440 between the buttons and add some animations. 192 00:14:56,480 --> 00:15:04,270 So these are things that will help you to make some real world apps which are modern and nice to 193 00:15:04,270 --> 00:15:05,590 use from the users. 194 00:15:05,800 --> 00:15:07,690 And to which you can actually sell. 195 00:15:08,140 --> 00:15:09,730 So let's do that in the next lecture's.