WEBVTT 00:00.410 --> 00:06.350 Often you will want to take one action when a conditional test passes and different action in other 00:06.350 --> 00:07.070 cases. 00:07.990 --> 00:11.710 Python's if else syntax makes this possible. 00:11.740 --> 00:17.710 The if else block is similar to a simple if statement, but the else statement allows you to define 00:17.710 --> 00:26.200 an action or a set of actions that are executed and run when the conditional test fails. 00:26.560 --> 00:30.820 When the if test fails, and in this case, we will execute else. 00:30.820 --> 00:33.220 So we will display some message here. 00:33.250 --> 00:43.210 Now let's let's write something that, for example, we have a car, a car here. 00:44.590 --> 00:47.680 And of sexual stroke here. 00:53.350 --> 01:00.550 And we don't this we don't want this car to, for example, older than ten years. 01:00.550 --> 01:01.270 Right. 01:05.350 --> 01:07.020 So let's make this. 01:07.910 --> 01:08.540 An. 01:09.710 --> 01:10.580 Years. 01:11.680 --> 01:15.820 So we want this car to less than ten years. 01:15.820 --> 01:18.820 So we will want a new car, Right. 01:18.850 --> 01:25.180 And that's why we're going to do here that let's make, for example, car model. 01:25.930 --> 01:27.970 Car model here. 01:27.970 --> 01:33.160 It's in this case, let's make it BMW and car here. 01:33.310 --> 01:35.380 In this case, let's make it. 01:39.420 --> 01:41.310 In 2015. 01:41.610 --> 01:46.020 And here we will add if our. 01:48.180 --> 01:49.070 Car model. 01:49.080 --> 01:54.000 So car year -2023in this case. 01:54.000 --> 01:57.690 Of course, today's year is 2023. 01:57.900 --> 01:59.820 And actually, let's delete this for now. 02:04.520 --> 02:05.660 So delete this. 02:07.220 --> 02:08.600 And now. 02:11.910 --> 02:15.720 Career -2020 23. 02:17.870 --> 02:18.710 Is. 02:22.930 --> 02:31.090 So our career, for example, in this case, our career is going to be eight, while eight is less than 02:31.090 --> 02:33.210 ten, then it will evaluate three. 02:33.220 --> 02:33.700 Right? 02:33.700 --> 02:39.490 So in this case, print your car is. 02:42.820 --> 02:44.800 And we will also use format here. 02:44.830 --> 02:51.130 Format your your car is a car here. 02:51.760 --> 02:59.770 The -273 years old and it's almost new. 02:59.770 --> 03:00.430 Right. 03:00.880 --> 03:03.580 And here we will also add else statement. 03:03.580 --> 03:12.850 If our car is has age of more than ten, we will write this here else print. 03:13.980 --> 03:15.090 Sorry. 03:15.240 --> 03:18.120 I don't want or sorry. 03:19.160 --> 03:20.600 Our company. 03:21.730 --> 03:22.450 Doesn't. 03:24.520 --> 03:26.470 Buys cars. 03:26.890 --> 03:28.960 Buy cars. 03:29.230 --> 03:32.650 That more that. 03:33.800 --> 03:36.950 Age is more than ten. 03:36.950 --> 03:43.420 And after I will print again and your your cars. 03:43.430 --> 03:44.690 Your car. 03:44.780 --> 03:46.220 Age is. 03:49.900 --> 03:54.760 Of course we need to add F here format per year. 03:54.970 --> 03:58.780 Per year -2023. 03:58.840 --> 04:02.680 Your car or let's actually instead of car we can also write BMW. 04:02.680 --> 04:03.130 Right. 04:03.130 --> 04:04.990 So or car model. 04:05.020 --> 04:10.450 Car model is years old and it's almost new. 04:11.670 --> 04:14.280 And we can buy it. 04:14.280 --> 04:18.870 And here also our company doesn't buy BMW. 04:18.960 --> 04:21.450 Let's actually add another format here. 04:21.690 --> 04:25.260 So we will add F here and format. 04:26.370 --> 04:26.970 Car. 04:28.510 --> 04:32.570 Model that age is more than ten and career here. 04:32.590 --> 04:33.940 Now let's run this. 04:34.060 --> 04:37.320 And as you can see here, your BMW oops. 04:37.330 --> 04:40.660 Actually, we need to do this opposite here. 04:42.820 --> 04:44.110 Sorry for this. 04:45.260 --> 04:49.880 We got right numbers, but we got negative here, so we need to do this. 04:50.150 --> 04:55.100 We need to subtract our career from 2023. 04:56.740 --> 04:58.050 Let's do the same here. 04:58.060 --> 04:59.260 And now. 04:59.260 --> 05:03.130 Your BMW is eight years old and it's almost new. 05:03.160 --> 05:06.340 We can buy it, but in LCR. 05:08.290 --> 05:15.430 A else comment here is didn't executed because if here evaluated true. 05:15.460 --> 05:25.270 If we make our car here for example 2005 then it will give your BMW is 18 years old and it almost no 05:25.870 --> 05:27.040 car here. 05:27.070 --> 05:29.380 Of course we need to change it again. 05:29.530 --> 05:32.050 2023 minus car year. 05:32.050 --> 05:34.030 And here we will get else here. 05:34.060 --> 05:37.330 Sorry, our company doesn't buy that buy BMW. 05:37.330 --> 05:41.470 That age is more than ten and your car age is 18. 05:41.470 --> 05:42.280 So. 05:43.340 --> 05:47.480 First in first example, actually, let's try again 2015. 05:48.020 --> 05:58.820 So in this example, our if conditional test passes and the first block of this print here call is executed. 05:58.820 --> 06:06.680 So if the test evaluates to false, then the else block is executed, for example, 2005. 06:06.680 --> 06:13.580 And in this case, our false will not be executed because it is here because. 06:15.490 --> 06:17.170 It is false, right? 06:17.170 --> 06:18.770 So it will not execute. 06:18.790 --> 06:22.630 Instead, our LS command here will execute here. 06:23.290 --> 06:29.260 So this code works because it has only two possible situations to evaluate. 06:29.740 --> 06:33.620 A car is either old enough or not. 06:33.640 --> 06:34.060 Right. 06:34.060 --> 06:42.570 So the if else structures works well in situations in which you want Python to always execute one of 06:42.580 --> 06:44.470 possible situations or actions. 06:44.470 --> 06:52.570 So in simple if else chain like this, one of two actions will always be executed. 06:52.570 --> 06:56.850 No matter if our car here is 1000 or so here, as you can see here. 06:56.860 --> 07:01.360 So our company owned by BMW age is more than ten.