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Added more tests and documentation to grade refactor.

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Bridger Maxwell
2012-04-15 16:07:16 -04:00
parent 03ea89f67f
commit 97f4f1b7ba
2 changed files with 56 additions and 2 deletions
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8
djangoapps/courseware/grades.py
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@@ -23,11 +23,15 @@ class CourseGrader(object):
class WeightedSubsectionsGrader(CourseGrader):
"""
This grader takes a list of tuples containing (grader, category_name, weight) and computes
a final grade by totalling the contribution of each sub grader and weighting it
accordingly. For example, the sections may be
a final grade by totalling the contribution of each sub grader and multiplying it by the
given weight. For example, the sections may be
[ (homeworkGrader, "Homework", 0.15), (labGrader, "Labs", 0.15), (midtermGrader, "Midterm", 0.30), (finalGrader, "Final", 0.40) ]
All items in section_breakdown for each subgrader will be combined. A grade_breakdown will be
composed using the score from each grader.
Note that the sum of the weights is not take into consideration. If the weights add up to
a value > 1, the student may end up with a percent > 100%. This allows for sections that
are extra credit.
"""
def __init__(self, sections):
self.sections = sections

50
djangoapps/courseware/tests.py
View File

@@ -140,6 +140,56 @@ class GraderTest(unittest.TestCase):
self.assertAlmostEqual( graded['percent'], 0.2 )
self.assertEqual( len(graded['section_breakdown']), 1 )
def test_WeightedSubsectionsGrader(self):
#First, a few sub graders
homeworkGrader = AssignmentFormatGrader("Homework", 12, 2)
labGrader = AssignmentFormatGrader("Lab", 7, 3)
midtermGrader = SingleSectionGrader("Midterm", "Midterm Exam")
weightedGrader = WeightedSubsectionsGrader( [(homeworkGrader, homeworkGrader.category, 0.25), (labGrader, labGrader.category, 0.25),
(midtermGrader, midtermGrader.category, 0.5)] )
overOneWeightsGrader = WeightedSubsectionsGrader( [(homeworkGrader, homeworkGrader.category, 0.5), (labGrader, labGrader.category, 0.5),
(midtermGrader, midtermGrader.category, 0.5)] )
#The midterm should have all weight on this one
zeroWeightsGrader = WeightedSubsectionsGrader( [(homeworkGrader, homeworkGrader.category, 0.0), (labGrader, labGrader.category, 0.0),
(midtermGrader, midtermGrader.category, 0.5)] )
#This should always have a final percent of zero
allZeroWeightsGrader = WeightedSubsectionsGrader( [(homeworkGrader, homeworkGrader.category, 0.0), (labGrader, labGrader.category, 0.0),
(midtermGrader, midtermGrader.category, 0.0)] )
graded = weightedGrader.grade(self.test_gradesheet)
self.assertAlmostEqual( graded['percent'], 0.5106547619047619 )
self.assertEqual( len(graded['section_breakdown']), (12 + 1) + (7+1) + 1 )
self.assertEqual( len(graded['grade_breakdown']), 3 )
graded = overOneWeightsGrader.grade(self.test_gradesheet)
self.assertAlmostEqual( graded['percent'], 0.7688095238095238 )
self.assertEqual( len(graded['section_breakdown']), (12 + 1) + (7+1) + 1 )
self.assertEqual( len(graded['grade_breakdown']), 3 )
graded = zeroWeightsGrader.grade(self.test_gradesheet)
self.assertAlmostEqual( graded['percent'], 0.2525 )
self.assertEqual( len(graded['section_breakdown']), (12 + 1) + (7+1) + 1 )
self.assertEqual( len(graded['grade_breakdown']), 3 )
graded = allZeroWeightsGrader.grade(self.test_gradesheet)
self.assertAlmostEqual( graded['percent'], 0.0 )
self.assertEqual( len(graded['section_breakdown']), (12 + 1) + (7+1) + 1 )
self.assertEqual( len(graded['grade_breakdown']), 3 )
for graded in [ weightedGrader.grade(self.empty_gradesheet),
weightedGrader.grade(self.incomplete_gradesheet),
zeroWeightsGrader.grade(self.empty_gradesheet),
allZeroWeightsGrader.grade(self.empty_gradesheet)]:
self.assertAlmostEqual( graded['percent'], 0.0 )
#section_breakdown should have all subsections from before
self.assertEqual( len(graded['section_breakdown']), (12 + 1) + (7+1) + 1 )
self.assertEqual( len(graded['grade_breakdown']), 3 )