WEBVTT 1 00:00:00.930 --> 00:00:02.500 Hi guys and welcome back. 2 00:00:02.500 --> 00:00:05.390 In this video we're going to building our first app. 3 00:00:05.390 --> 00:00:07.030 Think of it as a bit of a recap 4 00:00:07.030 --> 00:00:09.450 of everything we've learned so far. 5 00:00:09.450 --> 00:00:12.380 The app we're going to build will ask the users 6 00:00:12.380 --> 00:00:14.840 for their age, and then it will tell them 7 00:00:14.840 --> 00:00:17.230 how many months that age equals to. 8 00:00:17.230 --> 00:00:22.230 So for example, if they enter 10, the app will say 120 9 00:00:22.250 --> 00:00:25.420 because that's 12 months in each year of course. 10 00:00:25.420 --> 00:00:29.410 And so let's get start by asking the user for their age, 11 00:00:29.410 --> 00:00:32.340 and we will say for example, user underscore age, 12 00:00:32.340 --> 00:00:34.700 and then we're gonna use the input function 13 00:00:34.700 --> 00:00:39.233 to get the user's age, we'll say input Enter your age. 14 00:00:40.440 --> 00:00:43.450 Then remember that this is going to give you back a string, 15 00:00:43.450 --> 00:00:46.300 so we need to turn it into an integer or whole number 16 00:00:46.300 --> 00:00:48.470 so that we can do maths on it. 17 00:00:48.470 --> 00:00:53.203 So we will say something like years equal int of user age. 18 00:00:54.270 --> 00:00:57.120 Now we're gonna calculate the months that that equals to 19 00:00:57.120 --> 00:00:59.480 so that we can tell the user that information. 20 00:00:59.480 --> 00:01:03.103 So we'll say months equal years times 12. 21 00:01:04.010 --> 00:01:07.120 Finally, we're gonna print it out for the user to see. 22 00:01:07.120 --> 00:01:09.310 So you could do just print months, 23 00:01:09.310 --> 00:01:10.970 but that's not gonna tell the user a lot 24 00:01:10.970 --> 00:01:13.650 about what it actually means, this variable, 25 00:01:13.650 --> 00:01:15.470 unless they know what the programme does, 26 00:01:15.470 --> 00:01:17.100 it's not gonna be all that helpful. 27 00:01:17.100 --> 00:01:19.570 So instead, I recommend using an f string 28 00:01:19.570 --> 00:01:23.090 to print the information in a bit of a readable format. 29 00:01:23.090 --> 00:01:27.020 So we can say something like Your age, years, 30 00:01:27.020 --> 00:01:30.293 is equal to this many months. 31 00:01:32.070 --> 00:01:35.530 So if we run this file, then you get asked to enter your age 32 00:01:35.530 --> 00:01:37.810 let's say 30, and then you get, 33 00:01:37.810 --> 00:01:41.870 Your age, 30, is equal to 360 months. 34 00:01:41.870 --> 00:01:44.340 So this is our very first application 35 00:01:44.340 --> 00:01:47.020 that actually does something, and you can extend this 36 00:01:47.020 --> 00:01:49.220 further and I would encourage you to do so, 37 00:01:49.220 --> 00:01:50.790 just to play around with the code, 38 00:01:50.790 --> 00:01:54.070 and so that instead of printing out the number of months, 39 00:01:54.070 --> 00:01:55.930 you can print out the number of seconds 40 00:01:55.930 --> 00:01:57.360 that this is equal to. 41 00:01:57.360 --> 00:01:58.980 Of course the maths is gonna be slightly different, 42 00:01:58.980 --> 00:02:00.980 you're gonna have to multiply a few more things here 43 00:02:00.980 --> 00:02:02.840 to calculate the number of seconds, 44 00:02:02.840 --> 00:02:05.040 but that should let you play around 45 00:02:05.040 --> 00:02:06.400 with this code a little bit. 46 00:02:06.400 --> 00:02:08.490 Something else that you may wanna think about, 47 00:02:08.490 --> 00:02:10.880 is simplifying this code a little bit, 48 00:02:10.880 --> 00:02:13.120 'cause at the moment we've got our input 49 00:02:13.120 --> 00:02:16.330 and then we have this variable called user age, 50 00:02:16.330 --> 00:02:19.270 the user age variable is only used 51 00:02:19.270 --> 00:02:22.500 to be converted into an integer in the very next line. 52 00:02:22.500 --> 00:02:25.460 So actually, we could just put the int function 53 00:02:25.460 --> 00:02:30.130 around that input, so now what we're turning into an integer 54 00:02:30.130 --> 00:02:33.960 is the result of calling the input function 55 00:02:33.960 --> 00:02:35.690 which is gonna give us the string. 56 00:02:35.690 --> 00:02:39.750 So the value the user enters will be this, 57 00:02:39.750 --> 00:02:42.160 and then that will be turned into an integer. 58 00:02:42.160 --> 00:02:45.920 So we actually don't need this line at all, 59 00:02:45.920 --> 00:02:48.930 although we do need to use the user age 60 00:02:48.930 --> 00:02:51.090 instead of the years variable. 61 00:02:51.090 --> 00:02:52.760 And that is a little bit simpler, 62 00:02:52.760 --> 00:02:54.620 and the reason for doing that is, 63 00:02:54.620 --> 00:02:56.080 so that you don't have a variable 64 00:02:56.080 --> 00:02:58.520 that is only used as a temporary measure 65 00:02:58.520 --> 00:03:00.720 before it gets converted into another type, 66 00:03:00.720 --> 00:03:03.120 so you can put functions inside of functions 67 00:03:03.120 --> 00:03:04.400 when it makes sense, it can make your code 68 00:03:04.400 --> 00:03:07.130 a little bit less readable, but in this case, 69 00:03:07.130 --> 00:03:09.440 I think it's OK, it is simple enough 70 00:03:09.440 --> 00:03:11.890 that it should make a lot of sense. 71 00:03:11.890 --> 00:03:14.370 That's it for this video, do tackle the extension 72 00:03:14.370 --> 00:03:16.300 which is to print out the number of seconds 73 00:03:16.300 --> 00:03:18.900 instead of months, and I'll see you in the next one.