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Issue #23086: Add start and stop arguments to the Sequence.index() mixin method.

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This commit is contained in:
Raymond Hettinger 2015-05-22 19:29:22 -07:00
parent 256613c605
commit ec219ba1c0
5 changed files with 69 additions and 5 deletions
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35
Lib/test/test_collections.py
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@ -1227,6 +1227,41 @@ class TestCollectionABCs(ABCTestCase):
self.validate_abstract_methods(Sequence, '__contains__', '__iter__', '__len__',
'__getitem__')
def test_Sequence_mixins(self):
class SequenceSubclass(Sequence):
def __init__(self, seq=()):
self.seq = seq
def __getitem__(self, index):
return self.seq[index]
def __len__(self):
return len(self.seq)
# Compare Sequence.index() behavior to (list|str).index() behavior
def assert_index_same(seq1, seq2, index_args):
try:
expected = seq1.index(*index_args)
except ValueError:
with self.assertRaises(ValueError):
seq2.index(*index_args)
else:
actual = seq2.index(*index_args)
self.assertEqual(
actual, expected, '%r.index%s' % (seq1, index_args))
for ty in list, str:
nativeseq = ty('abracadabra')
indexes = [-10000, -9999] + list(range(-3, len(nativeseq) + 3))
seqseq = SequenceSubclass(nativeseq)
for letter in set(nativeseq) | {'z'}:
assert_index_same(nativeseq, seqseq, (letter,))
for start in range(-3, len(nativeseq) + 3):
assert_index_same(nativeseq, seqseq, (letter, start))
for stop in range(-3, len(nativeseq) + 3):
assert_index_same(
nativeseq, seqseq, (letter, start, stop))
def test_ByteString(self):
for sample in [bytes, bytearray]:
self.assertIsInstance(sample(), ByteString)