WEBVTT 00:00.000 --> 00:13.560 Hi everyone, in this video we are going to learn the if-else statement in Python. 00:13.560 --> 00:16.440 So this is the syntax for if-else statement. 00:16.440 --> 00:21.240 And when the given condition is true, the statements under if-execute, and otherwise 00:21.240 --> 00:24.000 the statements under else will be executed. 00:24.000 --> 00:27.680 And if you have two cases that you can have in your program, and if you want to take 00:27.680 --> 00:32.960 a particular action in either case, then you can use the if-else statement. 00:32.960 --> 00:35.080 Now see a real-time example here. 00:35.080 --> 00:39.680 We have the traffic signal, and the code is if-red-signal-stop. 00:39.680 --> 00:40.680 Else move. 00:40.680 --> 00:42.520 So we have the two cases. 00:42.520 --> 00:44.640 Case one is that the signal is red. 00:44.640 --> 00:46.800 Case two is that the signal is not red. 00:46.800 --> 00:49.840 So if the signal is red, you want to stop. 00:49.840 --> 00:53.360 Otherwise that is if it is not red, you can move. 00:53.360 --> 00:55.320 Now see an example program. 00:55.320 --> 00:58.600 This program checks if the input given is zero or non-zero. 00:58.600 --> 01:03.440 First, we ask the user to enter any number, and suppose the user enters 10 and it is 01:03.440 --> 01:04.840 stored to num. 01:04.840 --> 01:07.320 And now we have the if-else statement here. 01:07.320 --> 01:13.240 First, if num is equal to zero, so condition is that the entered number equal to zero, 01:13.240 --> 01:17.520 and here num equal to 10, which is not equal to zero. 01:17.520 --> 01:23.040 So the condition is failed, and the if part will not work, and the else part will work. 01:23.040 --> 01:24.840 And it will print non-zero. 01:24.840 --> 01:27.720 Now see another case where the user enters zero. 01:27.720 --> 01:32.680 Now the condition num-zero has become true, so the statements under if will be executed 01:32.680 --> 01:34.560 and zero will be printed. 01:34.560 --> 01:37.400 So that's all, and this is how if-else work. 01:37.400 --> 01:40.480 In the next video, we will discuss the nested if-else statement.