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For collections.deque() objects, expose the maxlen parameter as a read-only attribute.

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Raymond Hettinger 2009-03-10 12:56:32 +00:00
parent 060c7f6bba
commit 5bb0f0e072
4 changed files with 36 additions and 1 deletions
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10
Lib/test/test_deque.py
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@ -105,6 +105,16 @@ class TestBasic(unittest.TestCase):
d.extendleft(it)
self.assertEqual(list(it), [])
def test_maxlen_attribute(self):
self.assertEqual(deque().maxlen, None)
self.assertEqual(deque('abc').maxlen, None)
self.assertEqual(deque('abc', maxlen=4).maxlen, 4)
self.assertEqual(deque('abc', maxlen=2).maxlen, 2)
self.assertEqual(deque('abc', maxlen=0).maxlen, 0)
with self.assertRaises(AttributeError):
d = deque('abc')
d.maxlen = 10
def test_comparisons(self):
d = deque('xabc'); d.popleft()
for e in [d, deque('abc'), deque('ab'), deque(), list(d)]: