1 00:00:00,000 --> 00:00:03,433 Hi guys, and welcome back. In this video, we're going to solve 2 00:00:03,433 --> 00:00:07,433 the "functions" coding exercise. Let's get started! 3 00:00:07,433 --> 00:00:11,433 The exercise suggests that we have to complete a function called 4 00:00:11,433 --> 00:00:15,433 return_42, by making it actually return 42. 5 00:00:15,433 --> 00:00:18,066 If you look at the code, you can see that at the moment, 6 00:00:18,066 --> 00:00:22,066 the function return_42 is defined, but it doesn't do anything, 7 00:00:22,066 --> 00:00:25,532 it just has "pass", which means "do nothing" in Python. 8 00:00:25,533 --> 00:00:27,699 So we're going to delete that 9 00:00:27,700 --> 00:00:30,433 and then we're going to return 42 here. 10 00:00:30,433 --> 00:00:34,433 Remember that in order to complete the function successfully, you have 11 00:00:34,433 --> 00:00:37,933 to put 4 spaces, well, at least 2 spaces, 12 00:00:37,933 --> 00:00:42,199 but normally we put 4 spaces, in front of the third line. 13 00:00:42,200 --> 00:00:43,700 underneath the colon. 14 00:00:43,700 --> 00:00:47,366 So here we will type, "return 42". 15 00:00:47,366 --> 00:00:51,366 Notice that the function is called return_42 16 00:00:51,366 --> 00:00:54,232 but if you want it to actually return the value 42 17 00:00:54,233 --> 00:00:57,899 you just have to type the word "return", then a space, and then 42. 18 00:00:57,900 --> 00:01:01,033 You don't need any brackets or anything like that. 19 00:01:01,033 --> 00:01:06,066 Next up we have to create a function, which must be called "my_function" 20 00:01:06,066 --> 00:01:09,066 and it has to take two arguments, and return the result 21 00:01:09,066 --> 00:01:11,732 of the two arguments multiplied together. 22 00:01:11,733 --> 00:01:14,833 So, we're going to start by defining the function, 23 00:01:14,833 --> 00:01:18,066 we're going to type "def", and then "my_function" 24 00:01:18,066 --> 00:01:21,599 Then, the opening and closing brackets, and the colon. 25 00:01:21,600 --> 00:01:25,100 Now, because it takes two arguments, it needs two parameters: 26 00:01:25,100 --> 00:01:28,366 one for each argument, so here we're going to put two parameters. 27 00:01:28,366 --> 00:01:32,632 It doesn't matter what you call them, so we're going to type "arg1" and "arg2". 28 00:01:32,633 --> 00:01:36,633 They're comma-separated, and you don't need any quotation marks or anything around these 29 00:01:36,633 --> 00:01:40,633 these are going to be new variables that are created when the function is ran. 30 00:01:40,633 --> 00:01:44,633 So, there are our two parameters, and when we call this 31 00:01:44,633 --> 00:01:49,433 function with two arguments, their values will go into these variables. 32 00:01:49,433 --> 00:01:52,633 And you have to return the result of multiplying 33 00:01:52,633 --> 00:01:55,099 the two arguments together, so you'll type "return" 34 00:01:55,100 --> 00:01:59,100 and then "arg1 * arg2". 35 00:01:59,100 --> 00:02:02,833 Notice that for these exercises you don't have to actually call the functions 36 00:02:02,833 --> 00:02:06,833 it is the test code that we have written, that checks your code, 37 00:02:06,833 --> 00:02:09,966 that will actually call the functions and run them and make sure they together. 38 00:02:09,966 --> 00:02:13,632 So this is all that we have to do for this exercise, the next step 39 00:02:13,633 --> 00:02:17,033 is to check the solution, and as you can see it is correct, 40 00:02:17,033 --> 00:02:21,033 so then you can press "Continue" 41 00:02:21,033 --> 00:02:25,033 Hope that makes sense, and that this concludes the "Functions" section of 42 00:02:25,033 --> 00:02:26,599 this Python Refresher successfully. 43 00:02:26,600 --> 00:02:30,366 Thanks for joining me in this video, and I'll see you in the next one.