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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 = 196
group = 'functions'
number = 2
visible = True
solution = '''\
def max_abs(xs):
ma = xs[0]
for x in xs:
if abs(x) > abs(ma):
ma = x
return ma
'''
hint_type = {
'no_def': Hint('no_def'),
'no_return': Hint('no_return'),
'return_indent': Hint('return_indent'),
'for_loop': Hint('for_loop'),
'not_int': Hint('not_int'),
'return_first': Hint('return_first'),
'return_last': Hint('return_last'),
'return_greatest': Hint('return_greatest'),
'return_positive': Hint('return_positive'),
'return_indent': Hint('return_indent'),
'final_hint': Hint('final_hint')
}
def test(python, code):
test_lists = [[6, 4, 2, 0],
[4, 6, 2, 0],
[4, 2, 6, 0],
[4, 2, 0, 6],
[6, -8, 2, 0],
[-8, 6, 2, 0],
[8, -6, -2, 0],
[-5, -6, -2, -1],
[-8, -1, -6, -2],
[-1, -8, -6, -2],
[42],
[-42]]
test_in = [('max_abs(%s)'%str(l), None) for l in test_lists]
test_out = [6, 6, 6, 6, -8, -8, 8, -6, -8, -8, 42, -42]
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_lists[i]
tout = to
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 n_correct == len(test_in): # add an iteresting hint
tokens = get_tokens(code)
if not has_token_sequence(tokens, ['lambda']):
hints.append({'id': 'final_hint'})
return n_correct == len(test_in), hints
def hint(python, code):
tokens = get_tokens(code)
# having function max_val is necessary!
if not has_token_sequence(tokens, ['max_abs']):
return [{'id' : 'no_func_name', 'args' : {'func_name' : 'max_abs'}}]
# run one test first to see if there are any exceptions
answer = python(code=code, inputs=[('max_abs([1, 3, 3, -6, 4, 3, 2])', None)], timeout=1.0)
exc = get_exception_desc(answer[0][3])
if exc: return exc
# 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'}]
# test for wrong answers
res = answer[0][0]
if not isinstance(res, int):
return [{'id' : 'not_int'}]
cases = {
1: [{'id' : 'return_first'}],
2: [{'id' : 'return_last'}],
4: [{'id' : 'return_greatest'}],
6: [{'id' : 'return_positive'}]
}
if res in cases:
return cases[res]
# if has no return at the beginning of block,
# tell not to return from for
if not has_token_sequence(tokens, ['\n', 'return']):
return [{'id' : 'return_indent'}]
return None
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