1 00:00:00,180 --> 00:00:02,490 Currently when we run our code 2 00:00:02,910 --> 00:00:06,780 you can see that while we can input our answer, 3 00:00:07,380 --> 00:00:12,030 our code doesn't actually really care because it's not checking to see if it's 4 00:00:12,030 --> 00:00:14,280 right or wrong. In this lesson 5 00:00:14,310 --> 00:00:17,520 we're going to add one more method to our QuizBrain 6 00:00:17,970 --> 00:00:22,970 and that's the ability to check the answer that the user inputted and see if it 7 00:00:22,980 --> 00:00:27,870 was correct. And that means we need to keep track of the user's score. 8 00:00:27,990 --> 00:00:30,300 So we'll add another attribute score 9 00:00:30,540 --> 00:00:33,030 which has a default value of zero to begin with 10 00:00:33,360 --> 00:00:38,220 and it'll increase every time they get a question right. So in this lesson, 11 00:00:38,250 --> 00:00:42,660 we're going to create a new method called check_answer. 12 00:00:43,470 --> 00:00:48,470 And this check_answer function is going to be used to see if the user's answer 13 00:00:50,640 --> 00:00:55,640 which comes from this input is the same as the actual answer to the current 14 00:00:57,240 --> 00:00:58,073 question. 15 00:00:58,920 --> 00:01:03,920 What we need to do is we need to save this user's input inside a variable 16 00:01:05,190 --> 00:01:07,350 which we'll call user_answer. 17 00:01:08,430 --> 00:01:12,150 And then I'm going to call our check_answer method 18 00:01:12,600 --> 00:01:17,100 and I want to pass over the user_answer. Now, in addition, 19 00:01:17,100 --> 00:01:22,100 I also want to pass over the correct answer and the correct answer is going to 20 00:01:22,830 --> 00:01:26,130 be the current_question.answer. 21 00:01:26,430 --> 00:01:30,330 So let's replace that with current_question.answer 22 00:01:30,990 --> 00:01:35,190 because we know that current_question is a question object 23 00:01:35,490 --> 00:01:38,820 which has a text attribute and an answer attribute. 24 00:01:39,480 --> 00:01:44,480 And once we've passed over the user's answer and the correct answer, 25 00:01:45,180 --> 00:01:49,440 then we can receive it inside our check_answer function as a parameter. 26 00:01:50,580 --> 00:01:52,770 So we'll call this user_answer 27 00:01:53,340 --> 00:01:56,760 and the second one we'll call the correct_answer. 28 00:01:58,560 --> 00:02:01,860 So now this input is going to be passed over here 29 00:02:02,310 --> 00:02:06,210 and the correct answer is going to be under this variable name. 30 00:02:06,780 --> 00:02:11,780 So now we can see if the user_answer is equal to the correct_answer. 31 00:02:13,260 --> 00:02:14,790 And just for safety sake, 32 00:02:14,820 --> 00:02:18,840 it's usually a good idea to drop both sides to 33 00:02:18,840 --> 00:02:22,050 a lowercase so they are comparable. This way 34 00:02:22,050 --> 00:02:25,620 just in case the user answers True or true, 35 00:02:25,890 --> 00:02:27,660 it will be treated exactly the same. 36 00:02:28,860 --> 00:02:32,940 If the user_answer matches the correct answer, well 37 00:02:32,940 --> 00:02:35,880 then this means that they got it right, so let's print it. 38 00:02:38,550 --> 00:02:42,960 But on the other hand, if that was false then that means they got it wrong. 39 00:02:43,080 --> 00:02:45,210 So let's tell them that's wrong. 40 00:02:46,500 --> 00:02:51,500 Now it might also be a good idea to tell the user what the actual correct answer 41 00:02:51,750 --> 00:02:56,010 was. Now you have a choice depending on where you want to put that. 42 00:02:56,070 --> 00:03:01,070 So you can either choose to only show them the correct answer if they got it 43 00:03:01,510 --> 00:03:03,340 wrong like this. 44 00:03:03,580 --> 00:03:06,670 But I think it's actually a good idea to show them the correct answer 45 00:03:06,970 --> 00:03:08,320 even if they're got it right. 46 00:03:08,470 --> 00:03:13,030 So I'm going to change the indentation so that it's actually outside of the 47 00:03:13,030 --> 00:03:13,990 if/else block, 48 00:03:14,500 --> 00:03:19,120 and it's just simply going to happen once the if/else block is complete. 49 00:03:19,930 --> 00:03:24,930 Now, the next thing to do is to keep track of the user's score so that every 50 00:03:25,780 --> 00:03:30,760 time they get a question right then it should increase the score by one. 51 00:03:31,450 --> 00:03:36,450 Pause the video and add a new attribute called score to the QuizBrain class and 52 00:03:37,510 --> 00:03:41,650 increment it by one every time the user gets it right. Now, 53 00:03:41,650 --> 00:03:46,510 what you're aiming for is to be able to print out the score and the current 54 00:03:46,510 --> 00:03:51,510 question so that you can tell the user 'Your current score is:' and printed out 55 00:03:52,330 --> 00:03:54,340 after every single question. 56 00:03:55,300 --> 00:03:57,730 Pause the video now and complete this challenge. 57 00:04:00,400 --> 00:04:04,750 All right. So let's go ahead and create our new score attribute 58 00:04:05,110 --> 00:04:08,440 which is again going to have a default starting value of zero. 59 00:04:09,070 --> 00:04:12,820 And then whenever the user gets a question right, 60 00:04:13,090 --> 00:04:16,300 then we're going to increase their score by one. 61 00:04:16,660 --> 00:04:20,290 So let's tap into that score attribute and then increase it by one. 62 00:04:21,250 --> 00:04:24,010 Now we've got our score being tracked, 63 00:04:24,070 --> 00:04:28,810 then we want to be able to print out what the users' current score is. 64 00:04:29,350 --> 00:04:34,090 So at the end of the check_answer, let's create another print statement 65 00:04:34,450 --> 00:04:36,640 which gives the user their score. 66 00:04:36,820 --> 00:04:39,820 So 'Your current score is:' 67 00:04:40,360 --> 00:04:43,360 and then we'll insert the self.score. 68 00:04:44,440 --> 00:04:49,090 And we'll also tell them out of a possible number of questions, 69 00:04:49,120 --> 00:04:52,240 so we can insert the self.question_number. 70 00:04:52,660 --> 00:04:56,380 So this means that they've completed five questions so far where they've had 71 00:04:56,380 --> 00:04:58,600 five chances to get things right 72 00:04:58,930 --> 00:05:03,040 then we can show them that they got however many right out of those five. 73 00:05:03,370 --> 00:05:07,510 So maybe they got 3/5 right, or maybe they got 5/5 74 00:05:07,510 --> 00:05:10,570 right. And now if we run our code, 75 00:05:10,630 --> 00:05:12,970 we can see that print statement in action. 76 00:05:15,400 --> 00:05:18,850 So it tells me that I got it right and then the-- 77 00:05:19,930 --> 00:05:23,590 and then the correct answer was true. 78 00:05:24,070 --> 00:05:26,950 And that my current score is 1/1. 79 00:05:32,940 --> 00:05:33,773 Right 80 00:05:34,260 --> 00:05:36,780 Now, if I get one of these wrong, 81 00:05:37,350 --> 00:05:42,300 then you can see that my current score is now 3/4. 82 00:05:43,230 --> 00:05:46,800 And it tells the user that they've missed out on one point. 83 00:05:47,760 --> 00:05:51,510 It'd be nice to add a little bit of space in between each of the questions. 84 00:05:51,570 --> 00:05:55,110 I want to be able to see all the questions that I've done so far. 85 00:05:55,320 --> 00:05:56,910 So I don't want to clear the screen, 86 00:05:57,230 --> 00:06:00,020 but I want to be able to add a new line here. 87 00:06:00,560 --> 00:06:05,540 So at the end of my print statement, I'm going to add a print 88 00:06:05,570 --> 00:06:07,490 which is just going to print a new line. 89 00:06:08,780 --> 00:06:10,670 So that in between each question 90 00:06:10,670 --> 00:06:14,930 I have a little bit of space to tell each question apart from the other. 91 00:06:16,010 --> 00:06:20,060 The final thing I need to do is to tell the user 92 00:06:20,330 --> 00:06:23,660 their final score once the entire quiz is finished, 93 00:06:24,170 --> 00:06:29,170 and we want to be able to print something like 'You've completed the quiz' and 94 00:06:32,450 --> 00:06:34,730 then we'll print out, um, 95 00:06:34,760 --> 00:06:38,210 something like 'Your final score was:' 96 00:06:38,390 --> 00:06:42,230 and then we'll give them their final score so maybe they got 10/12 97 00:06:42,620 --> 00:06:47,420 correct. And this way they can see what their final outcome was. 98 00:06:47,900 --> 00:06:51,740 So have a think about how you might be able to print these two lines here 99 00:06:52,190 --> 00:06:57,190 and how you can get hold of the question number and the user's score to print 100 00:06:57,800 --> 00:07:01,820 inside our main.py. So pause the video and complete this challenge. 101 00:07:03,620 --> 00:07:06,080 All right. So the first line is very easy to print. 102 00:07:06,140 --> 00:07:08,990 All we need to do is wrap a print statement around it. 103 00:07:09,560 --> 00:07:13,610 The second line is a little bit more tricky because it will need to have an 104 00:07:13,610 --> 00:07:14,443 fstring. 105 00:07:14,450 --> 00:07:19,450 So we want this second value to be the total number of questions in the question 106 00:07:20,300 --> 00:07:21,133 bank, 107 00:07:21,350 --> 00:07:25,700 or it could be the current question number that the user is on. 108 00:07:26,270 --> 00:07:27,200 You can do either. 109 00:07:27,230 --> 00:07:32,230 You can either say question bank and wrap a length function around it, 110 00:07:34,100 --> 00:07:37,010 like this, which will give you the total number of questions 111 00:07:37,310 --> 00:07:40,880 cause we're at the end of the quiz now. Alternatively, 112 00:07:40,910 --> 00:07:45,910 you can also tap into the quiz object and get the question number when the quiz 113 00:07:46,910 --> 00:07:50,150 ended. And similarly with the score, 114 00:07:50,150 --> 00:07:52,370 you can say quiz.score. 115 00:07:53,120 --> 00:07:56,300 So now once the quiz has completed, 116 00:07:57,980 --> 00:08:01,700 you can see our print statements. You've completed the quiz and your final score 117 00:08:01,730 --> 00:08:06,500 was 0/12 because I was just button mashing and it didn't get any 118 00:08:06,500 --> 00:08:07,370 questions right.