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bpo-34637: Make the *start* argument for *sum()* visible as a keyword argument. #9208

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Merged
rhettinger merged 1 commit into from
Sep 12, 2018
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bpo-34637: Make the *start* argument for *sum()* visible as a keyword argument. #9208

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3 changes: 3 additions & 0 deletions Doc/library/functions.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1488,6 +1488,9 @@ are always available. They are listed here in alphabetical order.
see :func:`math.fsum`\. To concatenate a series of iterables, consider using
:func:`itertools.chain`.

.. versionchanged:: 3.8
The *start* parameter can be specified as a keyword argument.

.. function:: super([type[, object-or-type]])

Return a proxy object that delegates method calls to a parent or sibling
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3 changes: 3 additions & 0 deletions Lib/test/test_builtin.py
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Expand Up @@ -1297,6 +1297,9 @@ def test_sum(self):
self.assertEqual(sum(iter(Squares(10))), 285)
self.assertEqual(sum([[1], [2], [3]], []), [1, 2, 3])

self.assertEqual(sum(range(10), 1000), 1045)
self.assertEqual(sum(range(10), start=1000), 1045)

self.assertRaises(TypeError, sum)
self.assertRaises(TypeError, sum, 42)
self.assertRaises(TypeError, sum, ['a', 'b', 'c'])
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2018-09-11-17-25-44.bpo-34637.HSLqY4.rst
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@@ -0,0 +1 @@
Make the *start* argument to *sum()* visible as a keyword argument.
4 changes: 2 additions & 2 deletions Python/bltinmodule.c
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Expand Up @@ -2272,8 +2272,8 @@ With an argument, equivalent to object.__dict__.");
sum as builtin_sum

iterable: object
start: object(c_default="NULL") = 0
/
start: object(c_default="NULL") = 0

Return the sum of a 'start' value (default: 0) plus an iterable of numbers

Expand All @@ -2284,7 +2284,7 @@ reject non-numeric types.

static PyObject *
builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
/*[clinic end generated code: output=df758cec7d1d302f input=3b5b7a9d7611c73a]*/
/*[clinic end generated code: output=df758cec7d1d302f input=162b50765250d222]*/
{
PyObject *result = start;
PyObject *temp, *item, *iter;
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13 changes: 7 additions & 6 deletions Python/clinic/bltinmodule.c.h
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