* math.perm() and math.comb()

* math.isqrt()

* Add singledispatchmethod()

* itertools.accumulate()

* Optional headers for xmlrpc.client.ServerProxy

* IDLE non-BMP characters

* import collections.abc directly

* @coroutine is deprecated

* pprint.pp()

* New options for object.__reduce__()

* DictReader no longer returns OrderedDicts

* "force" option for logging.basicConfig()

* Fix spelling

* cProfile context manager

* Various markup/grammar fixes from Kyle Stanley.
Other minor fixes as well.
Also, dedup the __reduce__ entry.

* Fix markup

* Fix grammar nits found by MS Word

The reverse iterator for empty dictionaries was not handling correctly shared-key dictionaries.

The Nose package is no longer maintained.

This is partly a cleanup of the code. It also is preparation for getting the variables from the source (cross-platform) rather than from the symbols.

The change only touches the tool (and its tests).

test.regrtest now uses process groups in the multiprocessing mode
(-jN command line option) if process groups are available: if
os.setsid() and os.killpg() functions are available.

* bpo-27657: Fix urlparse() with numeric paths

Revert parsing decision from bpo-754016 in favor of the documented
consensus in bpo-16932 of how to treat strings without a // to
designate the netloc.

* bpo-22891: Remove urlsplit() optimization for 'http' prefixed inputs.

https://bugs.python.org/issue38418



Automerge-Triggered-By: @zooba

Added periods at the end of the sentences.

Also updates the documentation to clarify the situation surrounding
the digestmod parameter that is required despite its position in the
argument list as of 3.8.0 as well as removing old python2 era
references to "binary strings".

We indavertently had this raise ValueError in 3.8.0 for the missing
arg.  This is not considered an API change as no reasonable code would
be catching this missing argument error in order to handle it.

Fix a warning on a race condition on TestWorkerProcess.kill(): ignore
silently ProcessLookupError rather than logging an useless warning.

main() is now responsible to send the ANSWER, rather than
ServerProto. main() now waits until it got the HELLO before sending
the ANSWER over the new transport.

Previously, there was a race condition between main() replacing the
protocol and the protocol sending the ANSWER once it gets the HELLO.

TLSv1.3 was disabled for the test: reenable it.

* refactor python-config

* 📜🤖 Added by blurb_it.

* Update Misc/NEWS.d/next/Build/2019-10-13-16-18-24.bpo-38468.buCO84.rst
Co-Authored-By: Pablo Galindo <Pablogsal@gmail.com>

* Use getvar for pyver

* Update news entry with affected file.

* Update Misc/NEWS.d/next/Build/2019-10-13-16-18-24.bpo-38468.buCO84.rst
Co-Authored-By: Victor Stinner <vstinner@python.org>

* Update 2019-10-13-16-18-24.bpo-38468.buCO84.rst

Add a total_nframe field to the traces collected by the tracemalloc module.
This field indicates the original number of frames before it was truncated.

Fix test_compile_dir_maxlevels() on Windows without long path
support: only create 3 subdirectories instead of between 20 and 100
subdirectories.

Fix also compile_dir() to use the current sys.getrecursionlimit()
value as the default maxlevels value, rather than using
sys.getrecursionlimit() value read at startup.

* bpo-38461: ncurses misspelled as curses

* bpo-38463: Fix broken link

The symbol table handing of PEP572's assignment expressions is not resolving correctly the scope of some variables in presence of global/nonlocal keywords in conjunction with comprehensions.

* Misc gc code & comment cleanups.

validate_list:  there are two temp flags polluting pointers, but this checked only one.  Now it checks both, and verifies that the list head's pointers are not polluted.

move_unreachable: repaired incoherent comments.  Added new comments.  Cleared the pollution of the unreachable list head's 'next' pointer (it was expedient while the function was running, but there's no excuse for letting this damage survive the function's end).

* Update Modules/gcmodule.c
Co-Authored-By: Pablo Galindo <Pablogsal@gmail.com>