bpo-26329: update os.path.normpath documentation (GH-20138) (#27095)

(cherry picked from commit 66c5853406)

Co-authored-by: Furkan Onder <furkanonder@protonmail.com>
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Miss Islington (bot) 2021-07-12 08:22:33 -07:00 committed by GitHub
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@ -340,6 +340,14 @@ the :mod:`glob` module.)
that contains symbolic links. On Windows, it converts forward slashes to
backward slashes. To normalize case, use :func:`normcase`.
.. note::
On POSIX systems, in accordance with `IEEE Std 1003.1 2013 Edition; 4.13
Pathname Resolution <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13>`_,
if a pathname begins with exactly two slashes, the first component
following the leading characters may be interpreted in an implementation-defined
manner, although more than two leading characters shall be treated as a
single character.
.. versionchanged:: 3.6
Accepts a :term:`path-like object`.

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@ -349,6 +349,7 @@ def normpath(path):
initial_slashes = path.startswith(sep)
# POSIX allows one or two initial slashes, but treats three or more
# as single slash.
# (see http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13)
if (initial_slashes and
path.startswith(sep*2) and not path.startswith(sep*3)):
initial_slashes = 2