Minor performance tweak for deque.index() with a start argument (GH-9440)
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@ -288,6 +288,14 @@ class TestBasic(unittest.TestCase):
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else:
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self.assertEqual(d.index(element, start, stop), target)
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# Test large start argument
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d = deque(range(0, 10000, 10))
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for step in range(100):
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i = d.index(8500, 700)
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self.assertEqual(d[i], 8500)
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# Repeat test with a different internal offset
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d.rotate()
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def test_index_bug_24913(self):
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d = deque('A' * 3)
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with self.assertRaises(ValueError):
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@ -1050,8 +1050,10 @@ deque_index(dequeobject *deque, PyObject *const *args, Py_ssize_t nargs)
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start = stop;
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assert(0 <= start && start <= stop && stop <= Py_SIZE(deque));
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/* XXX Replace this loop with faster code from deque_item() */
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for (i=0 ; i<start ; i++) {
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for (i=0 ; i < start - BLOCKLEN ; i += BLOCKLEN) {
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b = b->rightlink;
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}
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for ( ; i < start ; i++) {
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index++;
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if (index == BLOCKLEN) {
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b = b->rightlink;
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