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# coding=utf-8
import re
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, HintSequence
id = 195
group = 'functions'
number = 1
visible = True
solution = '''\
def naj(xs):
naj = xs[0]
for x in xs:
if x > naj:
naj = x
return naj
'''
hint_type = {
'no_def': Hint('no_def'),
'no_return': Hint('no_return'),
'for_loop': Hint('for_loop'),
'if_clause': Hint('if_clause'),
}
def test(python, code):
test_in = [('naj([6, 4, 2, 0])', None),
('naj([4, 6, 2, 0])', None),
('naj([4, 2, 6, 0])', None),
('naj([4, 2, 0, 6])', None),
('naj([6, -8, 2, 0])', None),
('naj([-8, 6, 2, 0])', None),
('naj([-8, -6, -2, 0])', None),
('naj([-8, -6, -2, -1])', None),
('naj([-8, -1, -6, -2])', None),
('naj([-1, -8, -6, -2])', None),
('naj([42])', None),
('naj([-42])', None)]
test_out = [6, 6, 6, 6, 6, 6, 0, -1, -1, -1, 42, -42]
answers = python(code=code, inputs=test_in, timeout=1.0)
n_correct = sum(ans[0] == to for ans, to in zip(answers, test_out))
return n_correct, len(test_in)
def hint(python, code):
# run one test first to see if there are any exceptions
answer = python(code=code, inputs=[('naj([1, 2, 3, 6, 4, 2, 0])', None)], timeout=1.0)
exc = get_exception_desc(answer)
if exc: return exc
tokens = get_tokens(code)
# if has no def, tell him to define the function
if not has_token_sequence(tokens, ['def']):
return [{'id' : 'no_def'}]
# if has no return, tell him to return the value
if not has_token_sequence(tokens, ['return']):
return [{'id' : 'no_return'}]
# if has no loop, tell him to use it
if not has_token_sequence(tokens, ['while']) and \
not has_token_sequence(tokens, ['for']):
return [{'id' : 'for_loop'}]
# if has no condition if, tell him to use it
if not has_token_sequence(tokens, ['if']):
return [{'id' : 'if_clause'}]
return None
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