This is an initial version that likely requires much polishing. I'm adding it lay out the structure and so we have something to start working from.
(cherry picked from commit 98d50cb8)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

(cherry picked from commit 4cc3eb48)
Co-authored-by: Isaiah Peng <isaiah@users.noreply.github.com>

(cherry picked from commit 2a7bacbd)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

(cherry picked from commit 038b21f2)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

(cherry picked from commit 8709b236)
Co-authored-by: Barry Warsaw <barry@python.org>

Don't crash on warnings.warn_explicit() if module_globals is not a dict.
(cherry picked from commit b0565628)
Co-authored-by: Victor Stinner <vstinner@redhat.com>

Added to the eye-verified htest, not to the unittests.
Also remove some stray leftover comments.
(cherry picked from commit 389a48ed)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Also bump PendingDeprecationWarning to DeprecationWarning.
(cherry picked from commit 9eb40bc3)
Co-authored-by: Matthias Bussonnier <bussonniermatthias@gmail.com>

Remove the interpreters testing helper (and xid registry).

(cherry picked from commit 01abc6ec)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

(cherry picked from commit 046d3116)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

(cherry picked from commit 735abadd)
Co-authored-by: Segev Finer <segev208@gmail.com>

(cherry picked from commit b7b493e2)
Co-authored-by: Travis DePrato <773453+travigd@users.noreply.github.com>

(cherry picked from commit 30590424)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

(cherry picked from commit 00717a46)
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>

(cherry picked from commit d063b84d)
Co-authored-by: Ned Deily <nad@python.org>

bpo-33497: Add errors param to cgi.parse_multipart and make an encoding in FieldStorage use the given errors (GH-6804) (GH-6837)

(cherry picked from commit 545c955b)
Co-authored-by: Amber Brown <hawkowl@atleastfornow.net>

Remove os.posix_spawn, the API isn't complete and we're still figuring out how it should look. wait for 3.8.

Most of the parameters were added in 3.4.4 (b9bf913a), but this
change was not documented
(cherry picked from commit 0ded5804)
Co-authored-by: Romuald Brunet <romuald@chivil.com>

The urllib.robotparser's __str__ representation now includes wildcard
entries and the "Crawl-delay" and "Request-rate" fields.
(cherry picked from commit bd08a0af)
Co-authored-by: Michael Lazar <lazar.michael22@gmail.com>

(cherry picked from commit f0422421)
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>

(cherry picked from commit 2473eea6)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

Clarify that flush is implied when the call to write contains a newline character.
(cherry picked from commit 7ffd4c58)
Co-authored-by: Elena Oat <oat.elena@gmail.com>

This happens in the NixOS build sandbox, for example, where the only
other user is nobody with home directory /.
(cherry picked from commit 5c0d4626)
Co-authored-by: Anders Kaseorg <andersk@mit.edu>

./.github/PULL_REQUEST_TEMPLATE.md:8: MD031 Fenced code blocks should be
surrounded by blank lines
./.github/PULL_REQUEST_TEMPLATE.md:10: MD031 Fenced code blocks should
be surrounded by blank lines
./.github/PULL_REQUEST_TEMPLATE.md:19: MD031 Fenced code blocks should
be surrounded by blank lines
./.github/PULL_REQUEST_TEMPLATE.md:21: MD031 Fenced code blocks should
be surrounded by blank lines.
(cherry picked from commit 5cd22cf2)
Co-authored-by: Eitan Adler <grimreaper@users.noreply.github.com>

The hash implementation casts the input pointer to uint64_t* and directly reads
from this, which may cause unaligned accesses. Use memcpy() instead so this code
will not crash with SIGBUS on sparc.

https://bugs.gentoo.org/show_bug.cgi?id=636400
(cherry picked from commit 1e2ec8a9)
Co-authored-by: Rolf Eike Beer <eike@sf-mail.de>

Pass os.environ's copy to new process created at test_posix:
test_specify_environment. Otherwise important variables such as
LD_LIBRARY_PATH are not set and the child process might not work at all
in an environment where such variables are required for Python to function.
(cherry picked from commit 7ec8f286)
Co-authored-by: Miro Hrončok <miro@hroncok.cz>

(cherry picked from commit b551e9f0)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

(cherry picked from commit df00f048)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit ddb6215a)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit b3c36986)
Co-authored-by: Julien Palard <julien@palard.fr>

(cherry picked from commit 0904f766)
Co-authored-by: Grant Jenks <grant.jenks@gmail.com>

(cherry picked from commit ac9240b9)
Co-authored-by: jdemeyer <jdemeyer@cage.ugent.be>

This also fixes https://bugs.python.org/issue33420
(cherry picked from commit 43d12a6b)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

(cherry picked from commit bd5f9658)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

(cherry picked from commit cedc9b74)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

bpo-33422: Fix quotation marks getting deleted when looking up byte/string literals on pydoc. (GH-6701)


Also update the list of string prefixes.
(cherry picked from commit b2043bbe)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

(cherry picked from commit 491bbedc)
Co-authored-by: lekma <lekmalek@gmail.com>