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Small optimization for corner case where maxlen==0.

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This commit is contained in:
Raymond Hettinger 2009-03-10 09:31:48 +00:00
parent ced6b1da83
commit bac769bb5e
2 changed files with 41 additions and 1 deletions
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19
Lib/test/test_deque.py
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@ -50,7 +50,9 @@ 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), range(7, 10))
self.assertEqual(d, deque(range(10), 3))
@ -87,6 +89,21 @@ class TestBasic(unittest.TestCase):
fo.close()
test_support.unlink(test_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)]: