WEBVTT

1
00:00:00.140 --> 00:00:01.300
<v ->Hi and welcome back.</v>

2
00:00:01.300 --> 00:00:02.560
In this video we're going to be adding

3
00:00:02.560 --> 00:00:05.210
a little bit of error handling to our app,

4
00:00:05.210 --> 00:00:08.293
just so we can deal with any eventualities that may happen.

5
00:00:09.210 --> 00:00:10.050
We're gonna come here

6
00:00:10.050 --> 00:00:12.093
and we're gonna surround everything in here

7
00:00:12.093 --> 00:00:15.970
by a try/except block.

8
00:00:15.970 --> 00:00:16.803
Okay.

9
00:00:16.803 --> 00:00:18.972
And the first section is gonna be

10
00:00:18.972 --> 00:00:22.710
InvalidTagforAuthorError as e

11
00:00:22.710 --> 00:00:24.990
and it's just gonna print the error message

12
00:00:24.990 --> 00:00:28.672
and then we're gonna have a more generic exception.

13
00:00:28.672 --> 00:00:30.607
And we're gonna say something like,

14
00:00:30.607 --> 00:00:33.007
"An unknown error occurred.

15
00:00:33.007 --> 00:00:34.420
"Please try again."

16
00:00:34.420 --> 00:00:36.620
So this double except,

17
00:00:36.620 --> 00:00:38.200
I'm not sure we've looked at it before,

18
00:00:38.200 --> 00:00:40.770
but what happens is if an exception is raised

19
00:00:40.770 --> 00:00:43.793
in this block here and it is an InvalidTagForAuthorError,

20
00:00:44.920 --> 00:00:46.550
then it's gonna run this.

21
00:00:46.550 --> 00:00:49.910
If it's not that, then it is gonna run this

22
00:00:49.910 --> 00:00:52.950
because Exception is the base class for every exception.

23
00:00:52.950 --> 00:00:54.480
But you can have many of these

24
00:00:54.480 --> 00:00:57.600
and then they get less and less specific.

25
00:00:57.600 --> 00:01:01.020
We also do need to import our error there of course.

26
00:01:01.020 --> 00:01:06.020
So now if we run our app and we say we want Bob Marley

27
00:01:06.030 --> 00:01:08.833
and then we want something like magic.

28
00:01:09.711 --> 00:01:11.610
What you'll get is Chrome will launch,

29
00:01:11.610 --> 00:01:13.230
Bob Marley will be selected

30
00:01:13.230 --> 00:01:15.887
and then you'll get your message here,

31
00:01:15.887 --> 00:01:18.450
"Author Bob Marley does not have any question"

32
00:01:18.450 --> 00:01:19.690
Any question?

33
00:01:19.690 --> 00:01:20.540
Why question?

34
00:01:20.540 --> 00:01:22.340
I'm not sure why I typed question there.

35
00:01:22.340 --> 00:01:24.630
Does not have any quotes.

36
00:01:24.630 --> 00:01:26.820
I'm not sure why I decided to type question there

37
00:01:26.820 --> 00:01:28.290
but that's no problem.

38
00:01:28.290 --> 00:01:30.920
We fixed it and we've added our error handling

39
00:01:30.920 --> 00:01:32.210
there as well.

40
00:01:32.210 --> 00:01:33.190
That's it for this video.

41
00:01:33.190 --> 00:01:34.470
Thank you for joining me.

42
00:01:34.470 --> 00:01:35.920
I'll see you in the next one.