>>> from classroom_grades import compute_avg

--ini

>>> stgD = {
... 10: ['JBB', 0.0],
... 15: ['GWV', 5.5],
... 22: ['JJJ', 6.5],
... 27: ['AWV', 3.5],
... 31: ['MMP', 5.5],
... 35: ['BWV', 4.5],
... 42: ['SCC', 7.5],
... 49: ['BWV', 9.0],
... 55: ['FCC', 5.0],
... 72: ['ABC', 7.0],
... 81: ['GMM', 8.0],
... 92: ['MRP', 10.0],
... 99: ['ARG', 10.0],
... }

>>> cl1 = [
... [22, -1, 42, 81,  -1, 10,  -1],
... [15, -1, 25,  -1,  -1, 36, 49],
... [92, -1, 72,  -1, 31, 55, 99],
... ]

>>> sol = compute_avg(cl1[0], stgD)
>>> sol
(True, 5.5, 4)

>>> sol = compute_avg(cl1[1], stgD)
>>> sol
(False, 3, 25)

>>> sol = compute_avg(cl1[2], stgD)
>>> sol
(True, 7.5, 5)

--fi