…d add ChaCha20 Poly1305. (#224)

Backport: replace 3.5.3 with 3.4.7 in the doc versionchanged.

(cherry picked from commit 03d13c0)

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).

… 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 d174d24)

* Update NEWS

…H-1678) (#2248)

Based on patches by Duane Griffin and Tim Mitchell.
(cherry picked from commit 753bca3).
(cherry picked from commit 2f7f533)

…2164) (#2203)

* 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 23ec4b5)

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

New file: Modules/expat/siphash.h.
(cherry picked from commit 5ff7132)

* 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 c8fb58b)

* 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 87c6555)

… (#2291)

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 90e01e5)

…rver (#782)

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

(cherry picked from commit d274b3f)

…backs. (#2695)

* [3.4] bpo-26617: Ensure gc tracking is off when invoking weakref callbacks.
(cherry picked from commit 8f657c3)

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

* 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 388b90f)

* 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 7895a05)

* 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 d97b7dc
- commit 5c67933

* 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 5e22721)

Python 3.4 backport: convert the Misc/NEWS entry using blurb.

(cherry picked from commit 34e7e2e)

#3353)

* bpo-30947, bpo-31170: Update expat from 2.2.1 to 2.2.4

* Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to get security
  fixes.

* Update libexpat from 2.2.3 to 2.2.4. Fix copying of partial
  characters for UTF-8 input (libexpat bug 115):
  libexpat/libexpat#115

* Define XML_POOR_ENTROPY when compiling expat