WEBVTT 0 00:00.330 --> 00:01.620 In the previous lesson, 1 00:01.650 --> 00:06.650 we managed to get our QuizBrain up and running and to start asking the user for 2 00:07.200 --> 00:08.033 their answer. 3 00:08.550 --> 00:13.550 But currently, there's no way for our program to continue to the next question 4 00:14.220 --> 00:17.250 once the user has typed an input. However, 5 00:17.250 --> 00:19.920 if we take a look at the final version of the quiz game, 6 00:20.280 --> 00:23.400 you can see once the user's typed an input, it 7 00:23.400 --> 00:28.400 then goes to the next question and shows them the question number 2 8 00:28.620 --> 00:31.320 and the question text for that second question. 9 00:32.190 --> 00:36.360 How can we create that functionality to work with our QuizBrain? 10 00:37.050 --> 00:37.290 Well, 11 00:37.290 --> 00:42.210 if we could create another method called still_has_questions 12 00:42.540 --> 00:46.800 well then inside our main.py we could probably create a while loop and 13 00:47.140 --> 00:48.420 the while loop checks 14 00:48.480 --> 00:52.950 if the quiz still has questions remaining. 15 00:53.550 --> 00:57.240 Well, then in that case, we're going to keep going to the next question. 16 00:57.870 --> 01:02.870 So how do we create this functionality and how do we create it inside the 17 01:03.270 --> 01:07.680 QuizBrain? Your job is to create a new method here 18 01:08.040 --> 01:11.820 which is going to be called still_has_questions. 19 01:12.450 --> 01:16.440 And this is going to return a boolean, either true or false. 20 01:16.800 --> 01:18.240 And depending on that boolean, 21 01:18.360 --> 01:22.290 we can get our while loop to keep working and keep running and looping, 22 01:22.650 --> 01:25.020 or we're going to get the loop to stop 23 01:25.260 --> 01:28.050 once the quiz has run out of questions. 24 01:29.250 --> 01:33.000 Here's the behavior that you're looking for by the end of the challenge. 25 01:33.420 --> 01:38.280 The while loop should continue serving up the next question to the user until we 26 01:38.280 --> 01:40.050 reach the end of the quiz. 27 01:40.380 --> 01:45.380 Have a think about how the question number and the length of the question list 28 01:45.870 --> 01:50.190 relate to each other and see if you can complete this challenge. 29 01:53.820 --> 01:54.180 All right. 30 01:54.180 --> 01:59.180 So we know that we can get the length of our question list by using the Len 31 02:00.120 --> 02:05.120 function. Currently, in all the current version of the question bank, 32 02:05.700 --> 02:08.430 we have 12 questions in total. 33 02:08.880 --> 02:11.250 So the length is going to be 12. 34 02:11.850 --> 02:16.850 Now we want our loop to keep going until we've reached the number of questions 35 02:17.700 --> 02:18.570 in our list. 36 02:19.170 --> 02:24.170 What we could do is we could check to see if the self.question_number is 37 02:25.530 --> 02:30.530 less than the length of self.question_list. In that case, we'll return true, 38 02:32.430 --> 02:35.130 but otherwise we'll return false. 39 02:36.600 --> 02:40.980 Remember that this question number gets increased every time we show the user 40 02:40.980 --> 02:44.640 the next question. It starts out being zero 41 02:44.880 --> 02:46.920 and then it goes immediately to one. 42 02:47.370 --> 02:51.150 And then we get to the end of the next question function 43 02:51.540 --> 02:54.570 and we get to our while loop. So in our while loop, 44 02:54.600 --> 02:59.100 we can check to see if the quiz still has questions. 45 02:59.710 --> 03:04.210 And if this is true, then go to the next question. But if it's false, 46 03:04.240 --> 03:06.970 then exit the loop and we're at the end of the game. 47 03:08.050 --> 03:10.090 Back inside our QuizBrain 48 03:10.300 --> 03:15.300 we can actually simplify this method even more because we know that this is 49 03:16.020 --> 03:18.570 going to be evaluated by the computer 50 03:18.930 --> 03:23.010 and it's going to be either that true or false. If it is it's true 51 03:23.040 --> 03:26.130 then it goes into this block. And if it's false, 52 03:26.190 --> 03:27.900 then it goes into the else block. 53 03:28.410 --> 03:32.100 We can actually save ourselves all of this effort by 54 03:32.130 --> 03:36.540 simply just returning this expression. Now, 55 03:36.540 --> 03:41.540 what it's going to do is, let's say that a = 5 and b = 56 03:45.030 --> 03:45.863 3. 57 03:46.260 --> 03:50.100 And if we were to return five is 58 03:50.130 --> 03:51.540 greater than three, 59 03:51.870 --> 03:55.560 then this is basically the same as this expression 60 03:55.890 --> 04:00.150 which gets evaluated by the computer. And when this code runs, 61 04:00.180 --> 04:05.080 it's going to be either true or it's going to be false. So that 62 04:05.130 --> 04:07.860 that value is then going to be straight away 63 04:07.860 --> 04:12.180 returned by this method back into this while loop 64 04:12.240 --> 04:15.960 to see if we should continue going to the next question or not. 65 04:16.620 --> 04:21.510 So let's run this file and you can see it asks me the first question. 66 04:22.230 --> 04:24.480 And then it's going to go to the next question. 67 04:24.810 --> 04:29.810 And then it's going to basically keep going until it gets to the end of the list 68 04:31.230 --> 04:32.910 of questions and then it 69 04:32.970 --> 04:37.230 ends our entire program. In the next lesson 70 04:37.290 --> 04:42.150 we're going to figure out how we can check the answer that the user has inputted 71 04:42.150 --> 04:45.930 here and see if its actually the correct answer.