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# coding=utf-8
from python.util import has_token_sequence, string_almost_equal
from server.hints import Hint, HintSequence
id = 187
group = 'introduction'
number = 2
visible = True
solution = '''\
from math import *
g = 9.8
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'),
'eval_expression': Hint('eval_expression'),
'sin_error': HintSequence('sin_error', 4),
'name_error': HintSequence('name_error', 4),
'unsupported_operand': HintSequence('unsupported_operand', 4),
'error': HintSequence('error', 2),
'radians': HintSequence('radians', 3),
'printing': Hint('printing'),
'betterg': Hint('betterg'),
}
import re
numeric_const_pattern = r"""
[-+]? # optional sign
(?:
(?: \d* \. \d+ ) # .1 .12 .123 etc 9.1 etc 98.1 etc
|
(?: \d+ \.? ) # 1. 12. 123. etc 1 12 123 etc
)
# followed by optional exponent part if desired
(?: [Ee] [+-]? \d+ ) ?
"""
rx = re.compile(numeric_const_pattern, re.VERBOSE)
def contains_negative(s):
""" Returns whether the string contains negative value or not.
"""
vals = rx.findall(s)
for v in vals:
if float(v) < 0:
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'),
(None, '45\n10\n'),
(None, '40\n10\n'),
(None, '10\n10\n'),
(None, '80\n10\n'),
(None, '80\n20\n'),
(None, '80\n0\n')
]
test_out = [
'1020.4',
'1019.79',
'1019.79',
'0.0',
'0.0',
'51177.06',
'10.20',
'10.05',
'3.49',
'3.49',
'13.94',
'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
for output, correct in zip(outputs, test_out):
if string_almost_equal(output, float(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, '5\n10\n')]
answer = python(code=code, inputs=test_in, timeout=1.0)
exc = answer[0][3]
# if have an exception!
if exc:
if 'sin' in exc and 'NameError' in exc:
return [{'id':'sin_error', 'args': {'message': exc}}]
elif 'NameError' in exc:
return [{'id':'name_error', 'args': {'message': exc}}]
elif 'unsupported operand' in exc:
return [{'id':'unsupported_operand', 'args': {'message': exc}}]
elif 'TypeError' in exc:
return [{'id':'type_error', 'args': {'message': exc}}]
else:
return [{'id':'error', 'args': {'message': exc}}]
# show plan if student is lost
# a) empty progam
# b) there is not input (we can do it here, since we have no input hint)
if not code or (not has_token_sequence(code, ['input'])):
return [{'id': 'plan'}]
# if sinus is not in code, we need to teach students where they can get it
# use math functions.
if (not has_token_sequence(code, ['sin'])):
return [{'id' : 'eval_expression'}]
# student is not using print function
if not has_token_sequence(code, ['print']):
return [{'id' : 'printing'}]
# if result is negative, student did not translate to radians
if contains_negative(answer[0][1]):
return [{'id': 'radians'}]
# using g=10
if string_almost_equal(answer[0][1], 1.736, prec=2):
return [{'id': 'betterg'}]
return None
|
