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# coding=utf-8
id = 96
group = 'family_relations'
number = 3
visible = True
facts = 'family_relations'
solution = '''\
sister(X, Y) :-
parent(P, X),
parent(P, Y),
female(X),
X \== Y.
'''
import prolog.engine
import server.problems
def test(session, program):
# Test queries and expected answers (values of X).
queries = [
('sister(melanie, X)', set(['andrew'])),
('sister(X, andrew)', set(['melanie'])),
('sister(X, _)', set(['michelle', 'daniela', 'patricia', 'luana', 'sally', 'melanie', 'nevia', 'vanessa', 'anna'])),
]
code = program + '\n' + server.problems.load_facts('prolog', facts).facts
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id:
return 0, len(queries)
n_correct = 0
for query, solution in queries:
answers, error = prolog.engine.ask_all(engine_id, query=query, timeout=1.0)
if answers and answers[-1] != 'timed out':
values_x = set([ans.get('X') for ans, constraints in answers])
if values_x == solution:
n_correct += 1
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return n_correct, len(queries)
def hint(session, program):
if '\=' not in program and '\==' not in program:
return [{'id': 'x_y_must_be_different'}]
return None
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