1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
# coding=utf-8
from python.util import has_token_sequence, string_almost_equal, \
string_contains_number, get_tokens, get_numbers, get_exception_desc
from server.hints import Hint
id = 199
group = 'while_and_if'
number = 4
visible = True
solution = '''\
cena = 1
vsota, eltov = 0, 0
min_cena, max_cena = 100, 0
while cena != 0:
cena = int(input("Cena: "))
vsota += cena
eltov += 1
if cena < min_cena and cena > 0:
min_cena = cena
if cena > max_cena:
max_cena = cena
if eltov > 1:
pov = vsota / (eltov - 1)
print (vsota, pov, min_cena, max_cena)
'''
hint_type = {
'printing': Hint('printing'),
'while_clause': Hint('while_clause'),
'nonumber': Hint('nonumber'),
'while_condition': Hint('while_condition'),
'average': Hint('while_condition'),
}
def test(python, code):
# List of inputs: (expression to eval, stdin).
test_in = [
(None, '2\n4\n1\n0\n'),
(None, '1\n1\n1\n1\n1\n0\n'),
(None, '1\n2\n0\n'),
(None, '5\n4\n3\n11\n7\n0\n'),
(None, '0\n'),
]
test_out = [
(7, 2.333, 1, 4),
(5, 1, 1, 1),
(3, 1.5, 1, 2),
(30, 6, 3, 11),
(0, 0, 0, 0),
]
# List of outputs: (expression result, stdout, stderr, exception).
answers = python(code=code, inputs=test_in, timeout=1.0)
outputs = [ans[1] for ans in answers]
n_correct = 0
tin = None
for i, (output, correct) in enumerate(zip(outputs, test_out)):
if all(string_almost_equal(output, correct[i], prec=2) for i in range(4)):
n_correct += 1
else:
tin = test_in[i][1]
tout = correct
passed = n_correct == len(test_in)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
if tin:
hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin),
'sum': str(tout[0]),
'avg': str(tout[1]),
'min': str(tout[2]),
'max': str(tout[3])}})
return passed, hints
def hint(python, code):
tokens = get_tokens(code)
# run one test first to see if there are any exceptions
test_in = [(None, '1\n1\n1\n1\n1\n0\n')]
answer = python(code=code, inputs=test_in, timeout=1.0)
exc = get_exception_desc(answer[0][3])
if exc:
if 'NameError' in answer[0][3]:
return [{'id':'name_error', 'args': {'message': answer[0][3]}}]
else:
return exc
# student does not have while or for: instruct him on loops
if not has_token_sequence(tokens, ['while']) and \
not has_token_sequence(tokens, ['for']):
return [{'id' : 'while_clause'}]
# student is not using division, therefore computing no average
if not has_token_sequence(tokens, ['/']):
return [{'id' : 'average'}]
# student is not computing max and min values.
if not has_token_sequence(tokens, ['<']) and \
not has_token_sequence(tokens, ['>']):
return [{'id' : 'minimax'}]
# student is not using print function
if not has_token_sequence(tokens, ['print']):
return [{'id' : 'printing'}]
# student does not print any values
if not get_numbers(answer[0][1]):
return [{'id' : 'nonumber'}]
# student's answer is not correct
if not string_almost_equal(answer[0][1], 5):
return [{'id' : 'while_condition'}]
return None
|
