* Update config.{guess,sub} from gnu.org..
(cherry picked from commit 6f46683a)

* bpo-23787: Change sum() docstring from sequence to iterable

Original patch by Raymond Hettinger.

(cherry picked from commit 167e0fc2)

Also weakens the 'should this be run?' regex to allow all builds when .travis.yml changes.
(cherry picked from commit c53b13b2)

Metaprogramming a list of attributes was excessive, and made the code less readable and slower.

Backport of 5de3a641

Also on the short-lived `buildbot-custom` branch.
(cherry picked from commit d3bedf35)

Initially the macOS builds are allowed to fail until such time that they can be determined to be stable and not add an unacceptable amount of time to the overall Travis-passing process.
(cherry picked from commit 21c2dd7c)

(cherry picked from commit 0737ee20)

The "iterable iterable" phrasing created confusion between the term
reference and the parameter name.

This simplifies the phrasing to just use the parameter name
without linking directly to the term definition..
(cherry picked from commit 08e2f355)

(cherry picked from commit a5aa72ac)

(cherry picked from commit f34c6850)

(cherry picked from commit eba68e2c)

This fixes a faulty backport to the Python 2.7 branch only of http://bugs.python.org/issue28032. Details in the bpo-29766.

(cherry picked from commit 9616a82e)

* bpo-30414: multiprocesing.Queue._feed do not break from main loop on exc

Queue background running thread was not handling exceptions correctly.
Any exception occurred inside thread (putting unpickable object) cause
feeder to finish running. After that every message put into queue is
silently ignored.

* bpo-30414: multiprocesing.Queue._feed do not break from main loop on exc

Queue background running thread was not handling exceptions correctly.
Any exception occurred inside thread (putting unpickable object) cause
feeder to finish running. After that every message put into queue is
silently ignored..
(cherry picked from commit bc50f03d)

Ran the docstrings through spell checker, and fixed spelling issues.

(cherry picked from commit 81755471)

Based on patches by Duane Griffin and Tim Mitchell.
(cherry picked from commit 753bca39)

[2.7] bpo-25794: Fix `type.__setattr__()` for non-interned or unicode attribute names. (GH-1652) (#1675)

Based on patch by Eryk Sun.
(cherry picked from commit d896985b)

Patch by Davin with help from Marc.

Warnings emitted when compile a regular expression now always point
to the line in the user code.  Previously they could point into inners
of the re module if emitted from inside of groups or conditionals.

(cherry picked from commit c7ac7280)

Running Python with the -3 option now warns about regular expression
syntax that is invalid or has different semantic in Python 3
or will change the behavior in future Python versions.

Running Python with the -3 option now emits deprecation warnings for
getchildren() and getiterator() methods of the Element class in the
xml.etree.cElementTree module and when pass the html argument to
xml.etree.ElementTree.XMLParser().

Fixed a deprecation warning about the doctype() method of the
xml.etree.ElementTree.XMLParser class.  Now it is emitted only when
define the doctype() method in the subclass of XMLParser.

Fixed a bug in the test_bug_200708_close test method.  An EchoTarget
instance was incorrectly passed to XMLParser() as the html argument and
silently ignored.

Tests no longer failed when use the -m option for running only selected
test methods. Checking warnings now is more specific, warnings are
expected only when use deprecated features.

Catch the Windows socket WSAEINVAL error (code 10022) in imaplib
on shutdown(SHUT_RDWR): An invalid operation was attempted

This error occurs sometimes on SSL connections.
(cherry picked from commit 83a2c287)

* Use explicit numbering for footnotes referred by explicit number.
* Fix literal strings formatting in howto/urllib2.rst.
* Add `:noindex:` to duplicated definition of list.
* Update susp-ignored.csv for reference/expressions.rst.
(cherry picked from commit d97b7dc9)

* bpo-30357 each test in test_thread waits until all spawn threads finish

* bpo-30357 each test in test_thread waits until all spawn threads finish

* bpo-30357: test_thread now uses threading_cleanup() (#1592)

test_thread: setUp() now uses support.threading_setup() and
support.threading_cleanup() to wait until threads complete to avoid
random side effects on following tests.
Co-Authored-By: Victor Stinner <victor.stinner@gmail.com>

* bpo-30357: test_thread now uses threading_cleanup() (#1592)

test_thread: setUp() now uses support.threading_setup() and
support.threading_cleanup() to wait until threads complete to avoid
random side effects on following tests.
Co-Authored-By: Victor Stinner <victor.stinner@gmail.com>

(cherry picked from commit f25a8de8)

Also backport new functions temp_dir() and python_is_optimized().
temp_cwd() now accepts None as a name (means using tempfile.mkdtemp).
check_syntax_error() now accepts arguments lineno and offset.
Use more specific error messages in get_attribute().