So the programming quizzes aren't being graded solely on the result printed

Question

So the programming quizzes aren't being graded solely on the result printed, because this fails the "Sum of Probabilities" quiz, despite correctly printing 0.36:

#Modify the program to find and print the sum of all 
#the entries in the list p.
p=[0.2, 0.2, 0.2, 0.2, 0.2]
pHit = 0.6
pMiss = 0.2
s=[0,1,1,0,0]

print sum(map( (lambda x,y: x * ( pHit if y else pMiss)), p, s ))

Edit: on the next quiz, I get a "Good Job!" printed just above the execution result area, but a popup message of "Try again!"

Nothing I do gets rid of the "Try again!", even though I'm producing the right result (and returning it from my sense function).

Answer 1

1

I think that Question 9 (sense function) has a bug. I changed my code to the one ST is using afterwards and they also have in the notes and still got the same "Try again" response...

Edit: A note has been added for this question in the "Instructor comments" box:

Issues have been reported with the grading of this question. We are currently looking into it.

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answered 21 Feb, 09:16

mrigaki
613●9

edited 21 Feb, 09:41

Answer 2

0

These kind of things are normally assessed by a unit test.

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answered 21 Feb, 06:50

jholyhead
4.2k●11

Yeah, that's what I assumed, a unit test that does essentially an assertEqual( ACTUAL_VALUE, value_returned_by_student_expression()). But in that case, any student expression that evaluated to the correct result would pass. That's NOT what's happenning.

(21 Feb, 07:08) tpdi

But what does it test? Do you have to code in loops as if it were Fortran to pass the test?

(21 Feb, 07:17) lacucharita

Presumbaly it's some combination of an assertWhatIsPrinted (the look at the result) and a regex on the code/the text of the Python expression.

(21 Feb, 07:38) tpdi

the test will vary a parameter to test the logic of the function

(21 Feb, 09:47) jholyhead

So the programming quizzes aren't being graded solely on the result printed

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