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# coding=utf-8
from python.util import has_token_sequence
from server.hints import Hint, HintSequence
id = 180
group = 'introduction'
number = 1
visible = True
solution = '''\
f = float(input("Temperatura [F]: "))
c = 5/9 * (f – 32)
print("Temperatura je", c, "C")
'''
hint_type = {
'plan': Hint('plan'),
'no_input_call': Hint('no_input_call'),
'expressions_python': Hint('expressions_python'),
'printing': Hint('printing'),
'name_error': Hint('name_error'),
'unsupported_operand': Hint('unsupported_operand'),
'not_callable': Hint('not_callable'),
}
def test(python, code):
# List of inputs: (expression to eval, stdin).
test_in = [
(None, '32\n'),
(None, '212\n'),
(None, '-459.4\n'),
(None, '98.6\n'),
(None, '1832\n'),
]
test_out = [
'0',
'100',
'-273',
'37',
'1000'
]
# 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
for output, correct in zip(outputs, test_out):
if correct in output:
n_correct += 1
passed = n_correct == len(test_in)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
return passed, hints
def hint(python, code):
# run one test first to see if there are any exceptions
test_in = [(None, '212\n')]
exc = python(code=code, inputs=test_in, timeout=1.0)[0][3]
# have an exception!
if exc:
if 'NameError' in exc:
return [{'id':'name_error', 'args': {'message': exc}}]
elif 'not callable' in exc:
return [{'id':'not_callable', 'args': {'message': exc}}]
elif 'unsupported operand' in exc:
return [{'id':'unsupported_operand', 'args': {'message': exc}}]
elif 'TypeError' in exc:
return [{'id':'unsupported_operand', 'args': {'message': exc}}]
# the trick is to decide when to show the plan and when the first hint.
# I implemented a simple idea: show plan, when code contains something from the
# solution, but not input.
if len(code.strip()) < 5 or (not has_token_sequence(code, ['input']) and
(has_token_sequence(code, ['32']) or
has_token_sequence(code, ['=', '5']) or
has_token_sequence(code, ['print']))):
return [{'id': 'plan'}]
# if input is not present in code, student needs to learn about input
if not has_token_sequence(code, ['input']):
return [{'id': 'no_input_call'}]
# if tokens * or / or = are not in code, we have to teach them how to
# evaluate expressions.
if (not has_token_sequence(code, ['/']) or
not has_token_sequence(code, ['*']) or
not has_token_sequence(code, ['='])):
return [{'id' : 'expressions_python'}]
# student is not using print function
if not has_token_sequence(code, ['print']):
return [{'id' : 'printing'}]
return None
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