[Python-checkins] bpo-37134: Use PEP570 syntax for sum() (GH-13851)

[Miss Islington (bot)]

https://github.com/python/cpython/commit/23f41a64ea668296fa89e25f3cfa11f63026ecac
commit: 23f41a64ea668296fa89e25f3cfa11f63026ecac
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2019-06-05T16:21:08-07:00
summary:

bpo-37134: Use PEP570 syntax for sum() (GH-13851)

(cherry picked from commit c4c421d619baf2ff2f7e09f55b7ae22b8f863c7b)

Co-authored-by: Pablo Galindo <Pablogsal at gmail.com>

files:
M Doc/library/functions.rst

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 415a65b4946f..88977056723f 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1562,11 +1562,11 @@ are always available.  They are listed here in alphabetical order.
    about strings, see :ref:`textseq`.
 
 
-.. function:: sum(iterable[, start])
+.. function:: sum(iterable, /, start=0)
 
    Sums *start* and the items of an *iterable* from left to right and returns the
-   total.  *start* defaults to ``0``. The *iterable*'s items are normally numbers,
-   and the start value is not allowed to be a string.
+   total.  The *iterable*'s items are normally numbers, and the start value is not
+   allowed to be a string.
 
    For some use cases, there are good alternatives to :func:`sum`.
    The preferred, fast way to concatenate a sequence of strings is by calling