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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
id = 20604
number = 3
visible = True
solution = '''\
# Count number of elements in list xs.
def freq(xs):
hist = {}
for x in xs:
if x not in hist:
hist[x] = 0
hist[x] += 1
return hist
# Find element with maximal frequency
def max_freq(f):
max_freq = 0
max_item = None
for item, item_freq in f.items():
if item_freq > max_freq:
max_freq = item_freq
max_item = item
return max_item
def most_frequent(s):
return max_freq(freq(s.split())), max_freq(freq(s))
'''
hint_type = {
'final_hint': Hint('final_hint')
}
def test(python, code):
func_name = 'most_frequent'
tokens = get_tokens(code)
if not has_token_sequence(tokens, ['def', func_name]):
return False, [{'id' : 'no_func_name', 'args' : {'func_name' : func_name}}]
in_out = [
('a', ('a', 'a')),
('aa bb aa', ('aa', 'a')),
('in to in ono in to smo mi', ('in', ' ')),
('abc abc abc abacbca', ('abc', 'a')),
('abc abc abc abacbcb', ('abc', 'b')),
('abc abc abc abacbcc', ('abc', 'c')),
]
test_in = [('{0}("{1}")'.format(func_name, str(l[0])), None) for l in in_out]
test_out = [l[1] for l in in_out]
answers = python(code=code, inputs=test_in, timeout=1.0)
n_correct = 0
tin, tout = None, None
for i, (ans, to) in enumerate(zip(answers, test_out)):
n_correct += ans[0] == to
if ans[0] != to:
tin = test_in[i][0]
tout = to
passed = n_correct == len(test_in)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
if tin:
hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin), 'testout': str(tout)}})
if passed:
hints.append({'id': 'final_hint'})
return passed, hints
def hint(python, code):
tokens = get_tokens(code)
# run one test first to see if there are any exceptions
answer = python(code=code, inputs=[(None, None)], timeout=1.0)
exc = get_exception_desc(answer[0][3])
if exc: return exc
return None
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