(cherry picked from commit 71ca738f4cd2696d056d0cdb83bebd576f98ccc2)
Co-authored-by: Xiang Zhang <angwerzx@126.com>

(cherry picked from commit 5092439c)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

Make it the same as when one runs 'python'..
(cherry picked from commit 9d49f850)
Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>

Mention that it can be triggered by triple quotes and after specifying decorators.
(cherry picked from commit 68680035)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

" ... access to elements is O(1)."

(cherry picked from commit 7469ff50)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

Fix comparison between signed and unsigned integers. Example of fixed
warning:

Modules\_sre.c(838): warning C4018: '<' : signed/unsigned mismatch

(cherry picked from commit 1fa174a4)

* bpo-32962: python-gdb catchs ValueError on read_var() (GH-7692)

python-gdb now catchs ValueError on read_var(): when Python has no
debug symbols for example.

(cherry picked from commit 019d33b7)

* bpo-32962: python-gdb catchs UnicodeDecodeError (GH-7693)

python-gdb now catchs UnicodeDecodeError exceptions when calling
string().

(cherry picked from commit d22fc0bc)

bpo-29367: python-gdb.py now supports also method-wrapper
(wrapperobject) objects.

(cherry picked from commit 61108333)

'expresson list' refers to the grammar term 'expression_list' in the subscription production..
(cherry picked from commit 4fddd4e4)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

Hangul composition check boundaries are wrong for the second character
([0x1161, 0x1176) instead of [0x1161, 0x1176]) and third character ((0x11A7, 0x11C3)
instead of [0x11A7, 0x11C3])..
(cherry picked from commit d134809c)
Co-authored-by: Wonsup Yoon <pusnow@me.com>

string.Formatter auto-numbering feature was added in 3.4 and not
available in 2.7. Make the documentation unambiguous.

(cherry picked from commit d689f976)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

(cherry picked from commit 0aa17ee6)
Co-authored-by: Ammar Askar <ammar_askar@hotmail.com>

We can't just skip the test if docutils is available,
but pygments is not because the purpose of the test
was testing a bug in _check_rst_data().

(cherry-picked from b5bb404c)

If tests are re-run, use "xxx then yyy" result format (ex: "FAILURE
then SUCCESS") to show that some failing tests have been re-run.

Add also test_regrtest.test_rerun_fail() test.

(cherry picked from commit c45fc767)

- bugfix and test for fragile metavar handling in argparse (see
  bpo-24089, bpo-14046, bpo-25058, bpo-11874)
- also fixes some incorrect tests that did not make 1-element tuples correctly
(cherry picked from commit 66f02aa3)
Co-authored-by: wim glenn <wim.glenn@gmail.com>

testModeStrings and testTruncateOnWindows were depended on
a file leaked in other tests.

Also improve cleaning up after tests.
(cherry picked from commit c2745d2d)

test_io hangs with --huntrleaks: exclude the test in regrtest.

Substract one because listdir() opens internally a file
descriptor to list the content of the /proc/self/fd/ directory.

Add test_support.test_fd_count().

Move also MAXFD code before msvcrt.CrtSetReportMode(), to make sure
that the report mode is always restored on failure.

(cherry picked from commit 492d6424)

bpo-19418, bpo-33781: Fix the following warnings on Windows:

Modules\audioop.c(28): warning C4146: unary minus operator applied
    to unsigned type, result still unsigned
Modules\audioop.c(396): warning C4146: unary minus operator applied
    to unsigned type, result still unsigned

Move the floor() call into fbound() to call floor() on a double
rather than an int. The change should enhance the rounding.

Document also (int)double rounding mode.

(cherry picked from commit 45e4efba)

Fix the following compiler warning on Windows:
..\PC\_subprocess.c(384): warning C4018: '>' : signed/unsigned mismatch

(cherry picked from commit b8c0845f)

Raise TypeError instead of SystemError for unsupported operations.
(cherry picked from commit e9e39760)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Python 2.7 doesn't have FileNotFoundError exception: use OSError and
errno.ENOENT.

"python -m test --huntrleaks ..." now also checks for leak of file
descriptors.
Co-Authored-By: Richard Oudkerk <shibturn@gmail.com>

* test_tempfile.test_no_leak_fd() mocks os.close() but it doesn't
  call the original os.close() method and so leaks an open file
  descriptor. Fix the test by calling the original os.close()
  function.
* test_posix.test_fdopen_directory(): close the directory file
  descriptor when the test completes.

* Add support.wait_threads_exit(): context manager looping at exit
  until the number of threads decreases to its original number.
* Add some missing thread.join()
* test_asyncore.test_send(): call explicitly t.join() because the cleanup
  function is only called outside the test method, whereas the method
  has a @test_support.reap_threads decorator
* test_hashlib: replace threading.Event with thread.join()
* test_thread:

  * Use wait_threads_exit() context manager
  * Replace test_support with support
  * test_forkinthread(): check child process exit status in the
    main thread to better handle error.

Hide "recursedown('@test_9296_tmp')" message.

Backport manually regrtest enhancements from master:

* No longer clear filters, like --match, to re-run failed tests in
  verbose mode (-w option).
* Tests result: always indicate if tests have been interrupted.
* Enhance tests summary
* After failing tests are re-run, display again the summary.
* Add environment_altered to test.support, but it's currently unused
* regrtest: count also ENV_CHANGED as failures
* regrtest: Enhance format_duration()
* Replace test_support with support

(cherry picked from commit f7745e1d)
Co-authored-by: Tobias Kunze <r@rixx.de>

The bytes parameter uses big endian.
(cherry picked from commit b75ec085)
Co-authored-by: Farhaan Bukhsh <farhaan.bukhsh@gmail.com>

* Prevent spurious message if taking a shortcut
* Fix YAML style
* Disable largefile tests

It depended on a global variable set by other tests..
(cherry picked from commit 7cfd8c6a)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit e36837cb)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit e905c844)