WEBVTT 00:00.410 --> 00:06.380 Okay, so next up let's cover the optional arguments that have a default value. 00:06.380 --> 00:12.410 And I think we can work in the same file so that we can also take a look at different examples at the 00:12.410 --> 00:13.490 same time. 00:13.490 --> 00:19.640 So for this example let's add another function. 00:19.640 --> 00:23.360 And also let's call it greet with time. 00:23.360 --> 00:27.350 So we're also going to greet a specific person by name. 00:27.350 --> 00:35.690 But also we're going to have an optional time argument that will have a default value of day. 00:37.040 --> 00:42.110 So we're going to be returning a string and saying good time. 00:43.220 --> 00:44.810 So that can be a good day. 00:44.840 --> 00:46.880 Good morning good evening. 00:46.880 --> 00:47.750 Whatever. 00:49.430 --> 00:54.140 So now let's um, call it without this optional argument. 00:54.170 --> 00:56.690 So let's welcome Bob. 00:56.690 --> 01:04.010 And in another call, let's maybe welcome Charlie, but this time saying good evening. 01:06.320 --> 01:09.080 Let's also add a new line here everywhere. 01:09.080 --> 01:12.020 So we have a clear output. 01:12.890 --> 01:13.190 Okay. 01:13.190 --> 01:15.290 Now let's run this function. 01:15.290 --> 01:20.280 So we've got good day, Bob, as time has the default value of day. 01:20.280 --> 01:22.950 And when we provide the argument, there it is. 01:22.950 --> 01:24.210 Good evening. 01:24.210 --> 01:32.040 Now also, the order of the arguments here is pretty important because you can't really have an optional 01:32.040 --> 01:35.010 argument before a required one. 01:35.070 --> 01:43.110 This wouldn't even make any sense, because if I would move the time as the first one, which would 01:43.110 --> 01:50.760 be optional, then what's the point of having an optional argument before our required one? 01:50.760 --> 01:59.370 This would produce really weird syntax, and if I try to call it right now, I've got a different error 01:59.400 --> 02:06.540 saying that too few arguments were passed to greet with time, so one was passed in this example. 02:06.540 --> 02:10.620 Yet we actually have to pass two arguments. 02:10.620 --> 02:16.740 I might try with a comma here, but this is a syntax error. 02:17.880 --> 02:26.910 So as you see, you can't really realistically have the argument that's optional before a required one. 02:26.910 --> 02:30.840 And also it doesn't make any sense at all. 02:31.830 --> 02:31.980 Right.