1 1 00:00:02,800 --> 00:00:04,270 Let's start off by 2 2 00:00:04,270 --> 00:00:07,223 retrieving the item price from a website. 3 3 00:00:08,060 --> 00:00:08,893 Now, one of the key things that our application 4 4 00:00:08,893 --> 00:00:13,893 is going to do is, it's going to search through online sites 5 5 00:00:14,570 --> 00:00:18,080 that the users have given us and find which items 6 6 00:00:18,080 --> 00:00:20,830 are under the price that the user wants. 7 7 00:00:20,830 --> 00:00:22,650 So for that of course we need to be able 8 8 00:00:22,650 --> 00:00:24,070 to go into a website 9 9 00:00:24,070 --> 00:00:29,070 and a specific item in that website and find their price. 10 10 00:00:29,120 --> 00:00:32,400 So we're going to use a couple of tools to do that. 11 11 00:00:32,400 --> 00:00:35,140 We're going to use the requests module 12 12 00:00:35,140 --> 00:00:37,063 and we're going to use BeautifulSoup. 13 13 00:00:38,260 --> 00:00:39,930 So the first thing we do is to go over 14 14 00:00:39,930 --> 00:00:43,810 to your Pycharm preferences and instal those two things. 15 15 00:00:43,810 --> 00:00:47,320 So I'm going to go over to the project interpreter settings, 16 16 00:00:47,320 --> 00:00:50,460 make sure that you are in the correct interpreter 17 17 00:00:50,460 --> 00:00:53,883 and then press the plus icon and instal BeautifulSoup4. 18 18 00:00:55,935 --> 00:00:58,623 So this is important, it has to be BeautifulSoup4, 19 19 00:00:59,630 --> 00:01:02,820 nothing else, not BeautifulSoup or anything else. 20 20 00:01:02,820 --> 00:01:06,563 Make sure it's BeautifulSoup4 and then press instal. 21 21 00:01:07,590 --> 00:01:09,770 So this is going to instal BeautifulSoup4, 22 22 00:01:09,770 --> 00:01:11,040 this is the one we want 23 23 00:01:11,040 --> 00:01:14,050 and we also need the requests module. 24 24 00:01:14,050 --> 00:01:19,010 Again, make sure it is requests and not any other module 25 25 00:01:19,010 --> 00:01:21,260 that also has the name requests in it. 26 26 00:01:21,260 --> 00:01:23,260 Do make sure that it's just requests, 27 27 00:01:23,260 --> 00:01:25,500 as that is the one we want. 28 28 00:01:25,500 --> 00:01:27,630 And what requests is going to allow 29 29 00:01:27,630 --> 00:01:31,360 is for us to get the website that we're interested in, 30 30 00:01:31,360 --> 00:01:34,000 BeautifulSoup is going to allow us to understand 31 31 00:01:34,000 --> 00:01:37,470 what's in the website so that we can find out the price. 32 32 00:01:37,470 --> 00:01:41,330 So we're going to be be doing that, just press okay. 33 33 00:01:41,330 --> 00:01:45,250 And now we're going to use our app.py to build out 34 34 00:01:45,250 --> 00:01:49,260 something that will find the price in a given website. 35 35 00:01:49,260 --> 00:01:51,300 So I'm gonna delete the flask cap just for now, 36 36 00:01:51,300 --> 00:01:53,160 we're gonna bring it back later on. 37 37 00:01:53,160 --> 00:01:55,990 And the first thing to do is of course to figure out, 38 38 00:01:55,990 --> 00:01:59,790 how we're gonna find the price of a website. 39 39 00:01:59,790 --> 00:02:04,600 If we do import requests, then new can see something like 40 40 00:02:04,600 --> 00:02:08,360 requests.get, and what get is going to do 41 41 00:02:08,360 --> 00:02:12,210 is it's going to retrieve the contents of a website. 42 42 00:02:12,210 --> 00:02:15,710 And the website I'm gonna use in this sample app is 43 43 00:02:15,710 --> 00:02:17,870 this one here, johnlewis.com, 44 44 00:02:17,870 --> 00:02:20,050 this is a department store here in the UK 45 45 00:02:20,050 --> 00:02:23,210 which is quite popular and they have a nice website 46 46 00:02:23,210 --> 00:02:25,840 that we can retrieve item prices for. 47 47 00:02:25,840 --> 00:02:28,440 For this I would recommend that you use 48 48 00:02:28,440 --> 00:02:30,330 the same website as me. 49 49 00:02:30,330 --> 00:02:32,660 That way you can make sure that your code works 50 50 00:02:32,660 --> 00:02:35,260 and after that you can use a different website if you want. 51 51 00:02:35,260 --> 00:02:37,940 But for now, please do stick with the same website as me 52 52 00:02:37,940 --> 00:02:39,700 as some websites won't work, 53 53 00:02:39,700 --> 00:02:41,780 and I'll go into why in a moment. 54 54 00:02:41,780 --> 00:02:46,780 So when we have this requests.get, what we are getting 55 55 00:02:46,800 --> 00:02:50,930 is a response from this website. 56 56 00:02:50,930 --> 00:02:55,930 The response will contain the code that makes up that site. 57 57 00:02:57,500 --> 00:03:01,640 So I'm gonna print response.content just so you can see 58 58 00:03:01,640 --> 00:03:04,860 exactly what goes on when you make one of these requests. 59 59 00:03:04,860 --> 00:03:08,300 I'm gonna press play, and what you can see here 60 60 00:03:08,300 --> 00:03:10,070 is exactly what we got back. 61 61 00:03:10,070 --> 00:03:14,350 Notice that this is a very, very long set of text there, 62 62 00:03:14,350 --> 00:03:15,960 because what we've retrieved 63 63 00:03:15,960 --> 00:03:19,940 is the entire content of the page. 64 64 00:03:19,940 --> 00:03:23,850 And that page in johnlewis.com is an html page 65 65 00:03:23,850 --> 00:03:25,180 that we are retrieving. 66 66 00:03:25,180 --> 00:03:27,170 So this is how you can get that content. 67 67 00:03:27,170 --> 00:03:28,250 Let's go into the next video 68 68 00:03:28,250 --> 00:03:31,440 to understand what that content means. 69 69 00:03:31,440 --> 00:03:32,390 I'll see you there.