WEBVTT 00:00.120 --> 00:01.040 Welcome back. 00:01.080 --> 00:06.360 Sometimes you want your program to do different things based on certain conditions. 00:06.640 --> 00:12.040 Python uses if Elif which is else, if and else for decision making. 00:12.200 --> 00:16.880 For example, we have this age equals to 15 age variable. 00:16.920 --> 00:22.200 Let me test this age variable and make conditions according to this value. 00:22.360 --> 00:26.680 If age greater than or equal to 18, go and print. 00:26.680 --> 00:28.600 You are old enough to vote. 00:28.640 --> 00:33.320 Otherwise, if age is less than 18, go and print. 00:33.320 --> 00:35.800 Sorry, you are too young to vote. 00:35.840 --> 00:39.440 Run the application age equals to 15. 00:39.560 --> 00:43.080 Sorry your your are too young to vote. 00:43.120 --> 00:44.760 Change it to 20. 00:45.040 --> 00:48.480 Run the cell you are old enough to vote. 00:48.480 --> 00:52.240 So here we are using the age to check its value. 00:52.240 --> 00:58.760 If it is greater than 18, go and print this and if it is less than 18, go and print. 00:58.760 --> 01:01.120 Sorry, you're too young to vote. 01:01.160 --> 01:04.480 You can check multiple conditions using Elif. 01:04.600 --> 01:09.200 For example, if our age equals to 20, here we have three. 01:09.720 --> 01:12.590 Uh, three options. 01:12.590 --> 01:16.390 If age is less than 13, print you are a child. 01:16.390 --> 01:18.550 If it is less than 18. 01:18.750 --> 01:21.070 Create a new message. 01:21.270 --> 01:26.110 You're a teenager, and if it is greater than 18, print. 01:26.110 --> 01:27.710 You are an adult. 01:27.710 --> 01:29.870 Let me run and here we go. 01:29.910 --> 01:31.270 You are an adult. 01:31.310 --> 01:33.190 Change it to 15. 01:33.190 --> 01:36.910 For example, run the cell and you are a teenager. 01:36.910 --> 01:38.990 We are printing this state. 01:39.030 --> 01:41.230 Change it to ten here. 01:41.270 --> 01:42.990 If age is less than ten. 01:43.030 --> 01:46.030 Yes, the program puts ten here. 01:46.150 --> 01:48.070 The value of age which is ten. 01:48.110 --> 01:49.670 Ten less than 13. 01:49.710 --> 01:50.190 Yes. 01:50.190 --> 01:50.510 True. 01:50.550 --> 01:54.270 Go and execute this line of code which is printing. 01:54.270 --> 01:55.830 You are a child. 01:56.030 --> 02:00.950 So in this way the Python compiler executes the code. 02:00.990 --> 02:05.830 Okay, you can even nest if statements inside others. 02:05.830 --> 02:13.910 For example, we have age equals to 15 and we have another variable called has permission which is set 02:13.910 --> 02:14.710 it to true. 02:14.710 --> 02:20.430 Now if age equals to 18 or age less than 18. 02:20.470 --> 02:21.150 Print. 02:21.150 --> 02:27.790 You are a teenager now inside this if we need to create a nested if condition. 02:27.830 --> 02:30.710 Another nested if condition here. 02:30.830 --> 02:36.590 If we have a permission, go and you can watch PG 13 movies. 02:36.750 --> 02:40.270 Else print you need parental permissions. 02:40.270 --> 02:42.310 Let me test and see. 02:42.550 --> 02:45.030 You are a teenager. 02:45.070 --> 02:48.590 You can watch PG 13 movies. 02:48.790 --> 02:52.950 Now let me make this to false run. 02:52.990 --> 02:54.390 You are a teenager. 02:54.430 --> 02:58.030 True, you need parental permissions. 02:58.070 --> 03:07.470 Okay, so here we learned how to create a nested conditional statement inside the outer conditional 03:07.510 --> 03:08.270 statement. 03:08.310 --> 03:16.710 Okay you see guys how we use this conditional statements and the nested conditional statements. 03:16.710 --> 03:25.350 And those are very crucial for our decision making and for our programs because we need to create a 03:25.350 --> 03:29.510 lot of those conditional statements in our programs.