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author | Raymond Hettinger <python@rcn.com> | 2009-03-10 09:36:07 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2009-03-10 09:36:07 (GMT) |
commit | 060c7f6bbafdaeb4b73ce34f1bb34e4ac76f2d92 (patch) | |
tree | d7472b2a0f931bda82734a36bb45858066560793 /Lib | |
parent | 2cf03a820483babd243a48de47865585fa697235 (diff) | |
download | cpython-060c7f6bbafdaeb4b73ce34f1bb34e4ac76f2d92.zip cpython-060c7f6bbafdaeb4b73ce34f1bb34e4ac76f2d92.tar.gz cpython-060c7f6bbafdaeb4b73ce34f1bb34e4ac76f2d92.tar.bz2 |
Small optimization for corner case where maxlen==0.
Diffstat (limited to 'Lib')
-rw-r--r-- | Lib/test/test_deque.py | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py index 5d975f6..a9e010e 100644 --- a/Lib/test/test_deque.py +++ b/Lib/test/test_deque.py @@ -51,7 +51,9 @@ class TestBasic(unittest.TestCase): def test_maxlen(self): self.assertRaises(ValueError, deque, 'abc', -1) self.assertRaises(ValueError, deque, 'abc', -2) - d = deque(range(10), maxlen=3) + it = iter(range(10)) + d = deque(it, maxlen=3) + self.assertEqual(list(it), []) self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)') self.assertEqual(list(d), [7, 8, 9]) self.assertEqual(d, deque(range(10), 3)) @@ -88,6 +90,21 @@ class TestBasic(unittest.TestCase): fo.close() support.unlink(support.TESTFN) + def test_maxlen_zero(self): + it = iter(range(100)) + deque(it, maxlen=0) + self.assertEqual(list(it), []) + + it = iter(range(100)) + d = deque(maxlen=0) + d.extend(it) + self.assertEqual(list(it), []) + + it = iter(range(100)) + d = deque(maxlen=0) + d.extendleft(it) + self.assertEqual(list(it), []) + def test_comparisons(self): d = deque('xabc'); d.popleft() for e in [d, deque('abc'), deque('ab'), deque(), list(d)]: |