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Update sum comment. (#18240)

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Brandt Bucher 2020-02-01 03:08:34 -08:00 committed by GitHub
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Python/bltinmodule.c
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@ -2440,7 +2440,11 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
empty = []
sum([[x] for x in range(10)], empty)
would change the value of empty. */
would change the value of empty. In fact, using
in-place addition rather that binary addition for
any of the steps introduces subtle behavior changes:
https://bugs.python.org/issue18305 */
temp = PyNumber_Add(result, item);
Py_DECREF(result);
Py_DECREF(item);