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# coding=utf-8
from python.util import has_token_sequence
from server.hints import Hint, HintSequence
id = 1000
group = 'introduction'
number = 2
visible = True
solution = '''\
from math import *
g = 10
kot = float(input("Vnesi kot (v stopinjah): "))
v = float(input("Vnesi hitrost (v m/s): "))
kot_rad = kot * 2 * pi / 360
razdalja = v ** 2 * sin(2 * kot_rad) / g
print("Kroglo bo odneslo", razdalja, "metrov.")
'''
hint_type = {
'plan': Hint('plan'),
'name_error': HintSequence('name_error'),
'unsupported_operand': HintSequence('unsupported_operand'),
'syntax_error' : HintSequence('syntax_error'),
'indentation_error': HintSequence('indentation_error'),
'no_input_call' : Hint('no_input_call'),
'radians': HintSequence('radians'),
'printing': Hint('printing'),
'math_functions': Hint('math_functions')
}
def almostEqual(a, b, prec=1):
""" Compares values a and b using at most <code>prec</code> decimal values. """
return int(a*10**prec) == int(b*10**prec)
def stringAlmostEqual(s, a):
""" Searches string s for a value that is almost equal to a.
Args:
s (str): string to search
a (float): value to find in string
Returns:
bool: True if successful, else False
"""
for v in s.split():
try:
if almostEqual(float(v), a):
return True
return False
def test(python, code):
# List of inputs: (expression to eval, stdin).
test_in = [
(None, '45\n100\n'),
(None, '44\n100\n'),
(None, '46\n100\n'),
(None, '0\n100\n'),
(None, '90\n100\n'),
(None, '32\n747\n'),
]
test_out = [
'1000',
'999.39',
'999.39',
'0.0',
'0.0',
'50153.5'
]
# 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 stringAlmostEqual(output, correct):
n_correct += 1
return n_correct, len(test_in)
def hint(python, code):
# run one test first to see if there are any exceptions
test_in = [(None, '45\n')]
answer = python(code=code, inputs=test_in, timeout=1.0)
exc = answer[0][3]
# if have an exception!
if exc:
if 'NameError' in exc:
return [{'id':'name_error'}]
if 'unsupported operand' in exc:
return [{'id':'unsupported_operand'}]
if 'SyntaxError' in exc:
return [{'id':'syntax_error'}]
if 'IndentationError' in exc:
return [{'id':'indentation_error'}]
# if result if 893.996, angle is not converted to radians
if stringAlmostEqual(answer[0][1], 893.996):
return [{'id': 'radians'}]
# show plan if student is lost
if not code or (not has_token_sequence(code, ['input']) and
(has_token_sequence(code, ['pi']) or
has_token_sequence(code, ['sin']) 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']) or \
not has_token_sequence(code, ['float']):
return [{'id': 'no_input_call'}]
# if tokens sqrt or ** are not in code, we have to teach them how to
# use math functions.
if (not has_token_sequence(code, ['sqrt']) or
not has_token_sequence(code, ['**']):
return [{'id' : 'math_functions'}]
# student is not using print function
if not has_token_sequence(code, ['print']):
return [{'id' : 'printing'}]
return None
|
