Give itertools.repeat() a length method.
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@ -607,6 +607,12 @@ class TestVariousIteratorArgs(unittest.TestCase):
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self.assertRaises(TypeError, list, tee(N(s))[0])
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self.assertRaises(ZeroDivisionError, list, tee(E(s))[0])
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class LengthTransparency(unittest.TestCase):
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def test_repeat(self):
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self.assertEqual(len(repeat(None, 50)), 50)
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self.assertRaises(TypeError, len, repeat(None))
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class RegressionTests(unittest.TestCase):
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def test_sf_793826(self):
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@ -826,7 +832,7 @@ __test__ = {'libreftest' : libreftest}
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def test_main(verbose=None):
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test_classes = (TestBasicOps, TestVariousIteratorArgs, TestGC,
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RegressionTests)
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RegressionTests, LengthTransparency)
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test_support.run_unittest(*test_classes)
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# verify reference counting
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@ -2347,6 +2347,19 @@ repeat_next(repeatobject *ro)
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return ro->element;
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}
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static int
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repeat_len(repeatobject *ro)
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{
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if (ro->cnt == -1)
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PyErr_SetString(PyExc_TypeError, "len() of unsized object");
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return (int)(ro->cnt);
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}
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static PySequenceMethods repeat_as_sequence = {
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(inquiry)repeat_len, /* sq_length */
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0, /* sq_concat */
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};
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PyDoc_STRVAR(repeat_doc,
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"repeat(element [,times]) -> create an iterator which returns the element\n\
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for the specified number of times. If not specified, returns the element\n\
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@ -2366,7 +2379,7 @@ static PyTypeObject repeat_type = {
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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&repeat_as_sequence, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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