1 00:00:00,590 --> 00:00:08,180 Hi, welcome back in this video, we will build a desktop app which converts between different currencies, 2 00:00:09,110 --> 00:00:17,450 and it gets the currency from a real time website and its uses of that current currency rates to do 3 00:00:17,450 --> 00:00:19,910 the conversion between different currencies. 4 00:00:20,690 --> 00:00:27,560 So to be able to understand this video, you should have taken the previous video where we built a census 5 00:00:27,560 --> 00:00:31,820 maker app, a very simple app, which looks like this. 6 00:00:33,980 --> 00:00:36,650 So you enter some text on it makes a sentence, all of that. 7 00:00:37,040 --> 00:00:39,380 So now let's make the currency converter. 8 00:00:39,650 --> 00:00:47,360 I'm going to actually duplicate this file copied and pasted in the same directory. 9 00:00:47,840 --> 00:00:49,140 Give it another name. 10 00:00:49,820 --> 00:00:58,670 Currency converter, because now I'm just going to add more codes to this because the two apps are very 11 00:00:58,670 --> 00:00:59,390 similar. 12 00:01:00,260 --> 00:01:04,640 So I'm going to change the title to currency converter. 13 00:01:09,070 --> 00:01:16,030 For this video, all we're going to have is this input box here and then the button and then we get 14 00:01:16,030 --> 00:01:17,230 the outputs in here. 15 00:01:17,440 --> 00:01:22,540 So we're going to answer something like 10 and we're going to get the currency converted into euros. 16 00:01:22,690 --> 00:01:26,110 So for this app, we're going to focus only from USD two euros. 17 00:01:26,140 --> 00:01:32,830 Then in the next video, I'll show you how to add drop down lists here so that you can let the user 18 00:01:32,830 --> 00:01:35,650 convert between any currencies. 19 00:01:35,980 --> 00:01:38,860 For now, let's take things step by step as usual. 20 00:01:41,070 --> 00:01:44,910 So let's have a textbooks here, bottles and the label. 21 00:01:46,740 --> 00:01:51,690 That's the window, that's the layout, that's the text textbooks in here. 22 00:01:52,650 --> 00:01:55,000 The button, let's say, convert. 23 00:01:56,940 --> 00:02:05,100 And we added to the layout and then when the button is clicked, we're going to call a function also 24 00:02:05,100 --> 00:02:08,610 known as a slot in pie kutty. 25 00:02:09,150 --> 00:02:11,730 So this function currently is makes sentence. 26 00:02:12,540 --> 00:02:20,980 So I'm going to replace this with show currency and then provide it to you as well. 27 00:02:21,000 --> 00:02:22,020 Show currency. 28 00:02:22,470 --> 00:02:24,840 No need to call it just mentioned. 29 00:02:24,840 --> 00:02:26,970 It's inside the connect method. 30 00:02:27,330 --> 00:02:34,230 So show currency, show currency and then we give input, text, text, text, text points to this. 31 00:02:35,430 --> 00:02:36,390 Input books. 32 00:02:36,570 --> 00:02:39,870 Then we extract the actual value of that, the user enters. 33 00:02:40,290 --> 00:02:41,670 Let's say it is 10. 34 00:02:42,390 --> 00:02:44,670 So input tax will be equal to 10. 35 00:02:45,570 --> 00:02:48,660 Then what should we do to that value? 36 00:02:49,890 --> 00:02:52,650 Well, the input tax is going to be. 37 00:02:55,630 --> 00:02:59,980 Multiplied by the current exchange rate. 38 00:03:02,830 --> 00:03:11,590 And we're going to get the exchange rate from a function which we built previously in the course using 39 00:03:12,100 --> 00:03:13,210 beautiful soup. 40 00:03:14,200 --> 00:03:22,960 So if you didn't take that video is the ends and near the end of browser automation and the subscription 41 00:03:22,970 --> 00:03:23,380 section. 42 00:03:24,310 --> 00:03:28,450 So this was the code of ads, a function that we need. 43 00:03:31,620 --> 00:03:37,530 Also, we need the imports here, so I'm going to copy that and paste it won't talk in here. 44 00:03:39,680 --> 00:03:47,330 So we import some beautiful soup in this line, we import requests, and then this function gets an 45 00:03:47,330 --> 00:03:54,680 increase in all its currency value as arguments, and then it constructs this URL. 46 00:03:54,980 --> 00:04:03,680 So the URL is the URL that points to the excretes website, which gives us current currencies. 47 00:04:04,550 --> 00:04:14,030 So for example, if I gave this URL and I go to the browser, I answer it here and replace this port 48 00:04:15,500 --> 00:04:22,850 with from USD and to euro and enter. 49 00:04:23,120 --> 00:04:25,100 And it takes me to this page. 50 00:04:25,190 --> 00:04:27,680 So that's the current rate. 51 00:04:27,680 --> 00:04:30,920 As I am speaking, it changes every minute or so. 52 00:04:32,540 --> 00:04:39,410 So Python then is going to give a source code or that you URL of that page and then it's going to be 53 00:04:39,410 --> 00:04:49,160 extracting that elements of the email of that page where that value is, where that rate is. 54 00:04:49,790 --> 00:04:50,540 This one in here. 55 00:04:51,470 --> 00:04:52,230 So we did that. 56 00:04:52,270 --> 00:04:53,540 We built that already. 57 00:04:53,780 --> 00:04:58,550 And then we claim that value because it says this euro string. 58 00:04:58,550 --> 00:04:59,660 So we clean that out. 59 00:05:00,020 --> 00:05:05,270 We remove that euro and we end up with a float, which is going to be this number only. 60 00:05:05,630 --> 00:05:15,530 So this function, what this does is it returns the float, the rates, currency rate between any two 61 00:05:15,530 --> 00:05:16,790 exchange rates. 62 00:05:17,990 --> 00:05:25,070 So since we said that for this video, we're going to work only on exchanging from USD to euro. 63 00:05:25,670 --> 00:05:30,860 I'm just going to give them some default values for now. 64 00:05:31,070 --> 00:05:34,490 In the next video, we're going to have this completely dynamic. 65 00:05:35,120 --> 00:05:38,630 So for now, we have from USD two euros. 66 00:05:39,320 --> 00:05:50,000 And so back to our show currency function, no, this function is responsible to interact with our widgets, 67 00:05:50,210 --> 00:05:52,510 and this function is another thing. 68 00:05:52,580 --> 00:05:52,820 See? 69 00:05:52,910 --> 00:05:54,470 So this calculates stuff. 70 00:05:54,470 --> 00:06:02,330 It's processes external calculations, as it does in this case, it does a web scraping. 71 00:06:02,570 --> 00:06:09,830 This is not related to our graphical user interface, so we simply call this function in here now. 72 00:06:10,490 --> 00:06:13,220 So let's say. 73 00:06:14,960 --> 00:06:24,140 The rates, a sequel to get currency, and that's it, and then input tax times the rate, so let's 74 00:06:24,140 --> 00:06:31,510 say the user enters 10, we multiply that by the rate, which is this one, for example. 75 00:06:34,330 --> 00:06:35,440 And then we get. 76 00:06:37,050 --> 00:06:46,020 The ultimate so let's call this the ultimate, a sequel to that and then involved with labor. 77 00:06:47,580 --> 00:06:52,140 We provide the ultimate value of this one in here. 78 00:06:53,980 --> 00:06:55,230 Yes, so let's try this. 79 00:06:55,740 --> 00:07:03,120 First, I need to install this beautiful soup, which you can install by using PIP. 80 00:07:03,120 --> 00:07:10,590 Install Beauty for soup for beautiful soup for. 81 00:07:14,460 --> 00:07:17,650 I have a typo beauty, I'm missing an eye. 82 00:07:18,240 --> 00:07:24,420 Beautiful suit for the packages installed, and then we also need to install requests. 83 00:07:26,500 --> 00:07:26,840 Right. 84 00:07:26,860 --> 00:07:30,940 Once you install those, you're ready to run this code. 85 00:07:33,400 --> 00:07:41,050 So answer 10 press converts and the window disappears, and when that happens, it means you have an 86 00:07:41,050 --> 00:07:41,350 error. 87 00:07:41,500 --> 00:07:48,730 So look at your terminal and you see here I have an error in this line line 20. 88 00:07:50,120 --> 00:07:52,440 Twenty is here outputs. 89 00:07:53,420 --> 00:07:56,410 It says that it cannot multiply sequence by nonsense. 90 00:07:56,900 --> 00:08:00,410 That is because inputs text a string. 91 00:08:01,190 --> 00:08:03,590 So when the user enters 10. 92 00:08:06,490 --> 00:08:12,880 And here, Python will read it as a string, so what you want to do is you want to convert it into a 93 00:08:12,880 --> 00:08:13,480 float. 94 00:08:16,470 --> 00:08:21,210 And then you can use it to do multiplication and other math operations. 95 00:08:21,390 --> 00:08:22,140 So run again. 96 00:08:23,010 --> 00:08:23,910 And there's 10 here. 97 00:08:23,910 --> 00:08:26,910 Convert another error. 98 00:08:27,210 --> 00:08:29,520 Let's see this time it's in line 21. 99 00:08:32,429 --> 00:08:34,980 So ultimately will set texts, altitudes. 100 00:08:36,210 --> 00:08:47,350 This time it says that South Texas, as you see here, it accepts a screen as arguments, but argument 101 00:08:47,380 --> 00:08:48,960 was followed. 102 00:08:50,340 --> 00:08:58,020 So we have the floats here, which is a product of that times. 103 00:08:58,020 --> 00:09:04,260 That's so for this to work with sets text, you need to convert it into a string. 104 00:09:08,560 --> 00:09:09,310 So we're on again. 105 00:09:11,040 --> 00:09:13,290 Triton converts. 106 00:09:14,680 --> 00:09:15,730 And is the ultimate. 107 00:09:16,000 --> 00:09:22,540 So 10 euros is equal to eight point eight dollars. 108 00:09:23,410 --> 00:09:26,830 And of course, you can run this up using a round function. 109 00:09:29,830 --> 00:09:35,500 And have, for example, to numbers often the decimal point run. 110 00:09:37,510 --> 00:09:41,410 Twenty converts, and now it looks better. 111 00:09:41,980 --> 00:09:44,170 Six, six after the decimal points. 112 00:09:48,630 --> 00:09:51,720 And that's our scripts for now. 113 00:09:53,430 --> 00:10:02,160 So we built what we planned to build, and that was making an app which converts between euros and dollars 114 00:10:02,430 --> 00:10:09,900 now to make this even more advanced and let the user select what currencies they want to convert from 115 00:10:09,900 --> 00:10:15,420 and to, we need to use drop dropdown lists widgets. 116 00:10:16,710 --> 00:10:19,380 So we're going to do that in the next video. 117 00:10:19,380 --> 00:10:26,070 We're going to add to dropdown lists widgets before these other widgets. 118 00:10:26,340 --> 00:10:27,510 So sue in the next with you.