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bpo-30537: use PyNumber in itertools.islice instead of PyLong (#1918)

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* bpo-30537: use PyNumber in itertools instead of PyLong

* bpo-30537: revert changes except to islice_new

* bpo-30537: test itertools.islice and add entry to Misc/NEWS
This commit is contained in:
Will Roberts 2017-06-08 08:03:04 +02:00 • committed by Raymond Hettinger
parent 5edf827c80
commit 0ecdc52514
3 changed files with 20 additions and 4 deletions
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13
Lib/test/test_itertools.py
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@ -1243,6 +1243,19 @@ class TestBasicOps(unittest.TestCase):
support.gc_collect()
self.assertIsNone(wr())
# Issue #30537: islice can accept integer-like objects as
# arguments
class IntLike(object):
def __init__(self, val):
self.val = val
def __index__(self):
return self.val
self.assertEqual(list(islice(range(100), IntLike(10))), list(range(10)))
self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50))),
list(range(10, 50)))
self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50), IntLike(5))),
list(range(10,50,5)))
def test_takewhile(self):
data = [1, 3, 5, 20, 2, 4, 6, 8]
self.assertEqual(list(takewhile(underten, data)), [1, 3, 5])