(cherry picked from commit 3de14489)

* Issues #23808, #25911: Trying to fix walk tests on Windows.

On Windows a symlink can has the FILE_ATTRIBUTE_DIRECTORY flag.

(cherry picked from commit 388b90f2)

* bpo-30231: Remove skipped test_imaplib tests (#1419) (#2193)

The public cyrus.andrew.cmu.edu IMAP server (port 993) doesn't accept
TLS connection using our self-signed x509 certificate. Remove the two
tests which are already skipped.
(cherry picked from commit 7895a058)

* Backport CI config from master

* Add .travis.yml for Travis CI
* Add .github/ for AppVeyor and CodeCov.

* Travis CI: remove "make regen-all" check

The regen-all Makefile rule doesn't exist in Python 3.4, only since
Python 3.5 and newer (and 2.7).

* appveyor: replace --slowest with --slow

* Travis CI: remove the GCC coverage job

* Travis CI: remove tzdata resource from regrtest

tzdata resource doesn't exist in Python 3.4.

* Travis CI: remove the doc job

Fixing Sphinx warnings requires to backport huge intrusive changes
like:

- commit d97b7dc9
- commit 5c679339

* appveyor: set version to 3.4.6+

* bpo-30730: Fix test_os tests.

Fix test_invalid_cmd() and test_invalid_env(), TypeError is raised on
Python 3.4.

(cherry picked from commit 5e22721e586344b547194f0f7ea67fd425f94e72)

(cherry picked from commit 50f58163)

* [3.4] bpo-26617: Ensure gc tracking is off when invoking weakref callbacks.
(cherry picked from commit 8f657c35)

* Rewrite a NEWS entry as a NEWS.d entry.

Based on patch by Philipp Hagemeister.  This fixes a regression caused by
revision f4377699fd47.

(cherry picked from commit d274b3f1)

The current regex based splitting produces a wrong result. For example::

  http://abc#@def

Web browsers parse that URL as ``http://abc/#@def``, that is, the host
is ``abc``, the path is ``/``, and the fragment is ``#@def``.
(cherry picked from commit 90e01e50)

* bpo-29591: Upgrade Modules/expat to libexpat 2.2 (#2164)

* bpo-29591: Upgrade Modules/expat to libexpat 2.2

* bpo-29591: Restore Python changes on expat

* bpo-29591: Remove expat config of unsupported platforms

Remove the configuration (Modules/expat/*config.h) of unsupported
platforms:

* Amiga
* MacOS Classic on PPC32
* Open Watcom

* bpo-29591: Remove useless XML_HAS_SET_HASH_SALT

The XML_HAS_SET_HASH_SALT define of Modules/expat/expat.h became
useless since our local expat copy was upgrade to expat 2.1 (it's now
expat 2.2.0).

(cherry picked from commit 23ec4b57)

* bpo-30694: Upgrade Modules/expat/ to libexpat 2.2.1 (#2300)

New file: Modules/expat/siphash.h.
(cherry picked from commit 5ff71323)

* bpo-30726: PCbuild _elementtree: remove duplicate defines (#2348)

bpo-30726, bpo-29591: libexpat 2.2.1 of Modules/expat/ now uses
a winconfig.h configuration file which already defines:

* XML_NS
* XML_DTD
* BYTEORDER=1234
* XML_CONTEXT_BYTES=1024
* HAVE_MEMMOVE

Remove these defines from PCbuild/_elementtree.vcxproj to prevent
compiler warnings.
Co-Authored-By: Jeremy Kloth <jeremy.kloth@gmail.com>
(cherry picked from commit c8fb58bd)

* bpo-30726: Fix elementtree warnings on Windows due to expat upgrade (#2319)

* bpo-30726: Fix elementtree warnings on Windows

Caused by usage of `getenv` which should be safe. And a few integer
truncations which should also be ok.

* bpo-30726: Don't ignore libexpat warnings which haypo intends to fix upstream

(cherry picked from commit 87c65550)

Based on patches by Duane Griffin and Tim Mitchell.
(cherry picked from commit 753bca39).
(cherry picked from commit 2f7f533c)

[security][3.4] bpo-30730: Prevent environment variables injection in subprocess on Windows. (GH-2325) (#2362)

* [3.4] bpo-30730: Prevent environment variables injection in subprocess on Windows. (GH-2325)

Prevent passing other invalid environment variables and command arguments..
(cherry picked from commit d174d24a)

* Update NEWS

CPython workflow is changing!  We're going to start using "blurb"
to manage Misc/NEWS entries:
    https://github.com/python/core-workflow
(This will be a big win for release managers, honest.)

This checkin simply populates the "Misc/NEWS.d" subdirectory tree
so that people can start putting their news entries in there.
No other changes (yet).

Issues #27850 and #27766: Remove 3DES from ssl default cipher list and add ChaCha20 Poly1305. (#224)

Backport: replace 3.5.3 with 3.4.7 in the doc versionchanged.

(cherry picked from commit 03d13c0c)

non-integer numbers.  Django tests depend on this.

non-integer numbers.  Django tests depend on this.

when decode astral characters.

when decode astral characters.

plural form selections in the gettext module.  The expression parser now
supports exact syntax supported by GNU gettext.

plural form selections in the gettext module.  The expression parser now
supports exact syntax supported by GNU gettext.