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Taking The Quiz4:49 with Kenneth Love
Let's finish the last few pieces of our app and test it out.
Okay. 0:00 So we got this working like we want it to. 0:01 So that's it for the internet. 0:03 We still need to handle taking the quiz and stuff. 0:04 So let's get out of that, and 0:07 let's go up here and we've got take quiz and ask that we still need to write. 0:11 So, let's handle the asking part here. 0:16 Take out that pass. 0:21 Okay, so log the start time. 0:22 I think I actually wanna hold on to something else first, 0:25 I wanna hold on to correct, and I'm gonna make that equal to false. 0:27 So this says that, by default, they got the question wrong. 0:31 Okay, so we log the start time question start equals datetime.datetime.now. 0:35 And then answer would be input, 0:42 and we're going to do question.text plus space and equal sign and a space. 0:47 We could this with a format string if we wanted to, but 0:54 I wanted to bring back that plus sign because we haven't done that in a while. 0:56 If answer is equal to the string version of the questions answer. 1:00 And then we're going to set correct equal to true. 1:06 Okay, now no matter what, we're going to log the end time, so 1:11 question end would be datetime.datetime.now. 1:14 And then what we want to do is we want to send back whether or 1:19 not they got the question correct and question end minus question start. 1:23 So the elapsed time between one and the next. 1:29 Or sorry. Between the end and and 1:33 the beginning how much, how much time it took. 1:35 So, that's just ask, that's just the part where we ask the the questions. 1:37 We need to actually handle taking the quiz. 1:41 So let's go up here and figure out how to take the quiz. 1:43 So, here's what we're going to do. 1:47 Cuz we need to figure this out, right. 1:50 So first of all we want to log the start time. 1:51 So let's do self.starttime equals datetime.datetime.now. 1:53 Now, you remember that down here in our summary we're using 1:59 self.starttime self.end time so we need to remember to hold on to this. 2:03 Okay, so that's going to be right here. 2:10 So, now, we need to ask all of the questions. 2:12 So for question in self.questions, we want to loop through that. 2:15 Self.answers.append. 2:23 So we're going to stick into answers. 2:26 What gets returned when we call self.ask for the question that we're currently on. 2:28 And then, 2:34 we're going to bring in something new here which is this else keyword. 2:35 So, the for loop runs. 2:39 As long as nothing inside the for loop breaks, or throws an error to where 2:41 the loop ends prematurely, as long as the loop gets all the way to the end. 2:45 Then the else happens. 2:50 It's a little funnily named. 2:51 It ought to be like vin instead of else. 2:53 But that's what it is. 2:55 So we wanna do self.end time equals daytime.daytime.now. 2:57 And then, at the bottom, here, which really, we can do. 3:03 That one goes there. 3:10 That one goes there. 3:13 And then, here, we want to return self.summary. 3:16 So, the else is the only thing new here. 3:19 We talked about that. 3:21 That's, that's what fires, so long as the for loop completes correctly. 3:22 I still think it's a funny name, but that's what it is. 3:26 We need to do one more thing before we run this. 3:29 And what I want to is, down here at the very bottom, all the way at the bottom, 3:31 and completely outside of the class. 3:36 I want to call quiz and then call take quiz. 3:40 So that way we can just run the file, and it will start the quiz up for us. 3:46 Okay, so let's give that a try. 3:50 Come down here and we can do python quiz.py. 3:52 3 plus 10, 13. 3:58 6 plus 9, 15. 4:00 45, 13, 4:01 9, 9. 4:09 And I got 10 out of 10 right and it took 16 seconds. 4:15 So awesome, that worked just like we wanted it to. 4:18 That quiz app is simple, 4:22 but uses quite a bit of the Python that we've learned so far. 4:24 You can take it farther too. 4:27 Change the app so it takes a number of questions to generate. 4:29 Make it so that a user can specify the range they want the numbers to come from. 4:32 Or add in some further stats that tell you how long it took to answer each question. 4:36 In our next stage we are going to cover a common developer nightmare. 4:41 I can't promise you pleasant dreams, but 4:44 I'll do my best to shine a light on the monsters under the bed. 4:45
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