Python Jumpstart by Building 10 Apps Transcripts
Chapter: App 10: Movie Search App
Lecture: Adding search to the app

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0:00 All right, let's take the concepts that we had in our little playground script,
0:04 and let's move them over here to do a more proper application.
0:07 So here is our program app and just like all of it's got a main method,
0:11 it prints this little header, then it has this thing I am calling search event loop,
0:14 and we are just going to go around and around
0:16 and search for whatever the user wants to know about
0:19 and we'll print out information about it.
0:21 Here we have just a search text
0:23 and we are just going to go while they are not entering x, which means exit in our world,
0:27 and if they entered something they do want to search about
0:29 we are going to go and call MovieClient(search)
0:31 and then maybe we'll print out client,
0:34 to sort of just initialize it and then we can say perform search that will actually do it
0:39 and return the results, as a list of movie results named tuple kind of like we just saw.
0:46 So if I run this we should have something reasonable come out of here,
0:49 so if I search for cats, see what we get for cats,
0:53 boom, there we go, cats and dogs, it looks like it's working great.
0:57 Now, let's go over here and look at the movie client,
0:59 this exactly takes the ideas we had Request collections are named tuple
1:03 with these types in here and it just moves this over to a class,
1:08 so the class knows search text
1:10 and then you can perform the search on it not really super excited about this api,
1:14 I probably could have done it better, but whatever, it gets the point across.
1:17 We really need somewhere to introduce instability to our app
1:21 so that's kind of what this is about.
1:22 Here we can take whatever search text they gave us
1:24 and we are just going to plunk it in there
1:26 and we are going to go search for it exactly the way we saw
1:28 and we are using this super nice Pythonic style of saying
1:31 using the dictionary unpacking into the named tuple
1:34 and building up a list via list comprehensions.
1:39 Maybe we could do one more thing,
1:41 maybe we want to sort by title I don't know we could do that if we wanted,
1:44 we could say movies.sort(key=lambda m: m.Title), like that, all right,
1:51 so this works great, let's just run it one more time,
1:53 let's search for a capital and let's actually change the output,
1:57 so we can see decent results down there,
1:59 so we are just printing out the list, let's say like this print("Found {} results."),
2:06 we'll do a little format there and len of let's go up here and say results,
2:12 it was client.perform search and we'll say results here,
2:16 yeah, we'll say for r in results:, print and well just do like this,
2:21 we'll say year--title.format.
2:25 So here well just say r.Year, r.Title so let's go look for capital again,
2:31 here you can see these results pretty cool,
2:35 I found a bunch of stuff about capital and the one that was actually cool
2:38 is this one from 2014 capital c.
2:40 Ok, so this is working pretty well,
2:42 I think there is some rate limiting on the api actually
2:45 and we may end up running into that as well
2:48 so that's going to be an interesting result,
2:50 but let's suppose something happens like our network goes down, right here,
2:57 so no network, turned it off, let's see how this bad boy runs now,
3:01 I am looking for cats remember, cats and dogs was our first result
3:05 and uuu this is bad, so we have a request.exceptions.ConnectionError,
3:11 the internal details are the connection pool with these settings failed
3:16 and this was caused by a new connection error
3:18 which was caused by da da da da da there is no network.
3:21 Ok, so what we need to do is write some code so that instead of doing this
3:25 it just says it keeps going to this loop and it says hey,
3:29 that didn't work so well, looks like your network is down.
3:32 If you turn it back on, we would be able to work again,
3:35 so let's go do that next.