BytesWarning no longer emitted when the fromlist argument of
__import__() or the __all__ attribute of the module contain bytes
instances..
(cherry picked from commit 41c56940)

(cherry picked from commit 275d2d9c)

(cherry picked from commit 66caacf2)

test_unparse.DirectoryTestCase now stores the names sample to always
test the same files. It prevents false alarms when hunting reference
leaks.
(cherry picked from commit 8e482bea)

SyntaxError now is raised instead of SyntaxWarning.
(cherry picked from commit 3b66ebe7)

(cherry picked from commit 62adc55a)

bpo-31752: Fix possible crash in timedelta constructor called with custom integers. (GH-3947) (#4086)

Bad remainder in divmod() in intermediate calculations caused an assertion failure.
(cherry picked from commit 4ffd4653)

(cherry picked from commit 85f64302)

(cherry picked from commit 04e36af9)

(cherry picked from commit bcbdd2f8)

[3.6] bpo-28326: Fix multiprocessing.Process when stdout and/or stderr is closed or None. (GH-4073).  (#4075)

* bpo-28326: Fix multiprocessing.Process when stdout and/or stderr is closed or None. (#4073)

(cherry picked from commit daeefd2e)

* [3.6] bpo-28326: Fix multiprocessing.Process when stdout and/or stderr is closed or None. (GH-4073).
(cherry picked from commit daeefd2e)

and in codecs.escape_decode() when decode an escaped non-ascii byte.
(cherry picked from commit 56cb465c)

(cherry picked from commit ea2ef5d0)

This used to be the case on Python 2.  Commit
212b590e changed the implementation for Python
3, making the `log()` method of LogAdapter call `logger._log()` directly.  This
makes nested log adapters not execute their ``process()`` method.  This patch
fixes the issue.

Also, now proxying `name`, too, to make `repr()` work with nested log adapters.

New tests added.
(cherry picked from commit ce9e6254)

Due to a bug in the initial fix, the setter was in fact creating a different
property.  This is now fixed.
(cherry picked from commit 0b6a118a)

The word "difference" from missing the sentence.
This clarifies that it compares the difference between the two objects.
(cherry picked from commit 032a6480)

Always pass -1, or INFTIM where defined, to the poll() system call when
a negative timeout is passed to the poll.poll([timeout]) method in the
select module. Various OSes throw an error with arbitrary negative
values.
(cherry picked from commit 6cfa927c)

[3.6] bpo-31806: Use _PyTime_ROUND_TIMEOUT for the timeout argument parsing in more functions (GH-4026) (#4032)

Fix timeout rounding in time.sleep(), threading.Lock.acquire() and
socket.socket.settimeout() to round correctly negative timeouts between -1.0 and
0.0. The functions now block waiting for events as expected. Previously, the
call was incorrectly non-blocking.
(cherry picked from commit 59af94fa)

[3.6] bpo-31786: Make functions in the select module blocking when timeout is a small negative value. (GH-4003). (#4022)

(cherry picked from commit 2c15b29a)

test_load_source() now replaces the current __name__ module with a
temporary module to prevent side effects.
(cherry picked from commit a505ecdc)

(cherry picked from commit 27288de0)

Even if one selects a font that defines a limited subset of the unicode
Basic Multilingual Plane, tcl/tk will use other fonts that define a
character. The expanded example give users of non-Latin characters
a better idea of what they might see in the IDLE shell and editors.

To make room for the expanded sample, frames on the Font tab are
re-arranged. The Font/Tabs help explains a bit about the additions.
(cherry picked from commit e2e42274)

(cherry picked from commit de86073a)

bpo-31799: Make module.__spec__ more discoverable
(cherry picked from commit 191e3138)

(cherry picked from commit 676db4bb)

(cherry picked from commit 1295e11d)

(cherry picked from commit 1b9e76ed)

Patch by Pablo.
(cherry picked from commit 28773ca7)

Follow-up to Victor's patch that enabled autotest to run in IDLE's Shell.
(cherry picked from commit 620f70ee)

(cherry picked from commit cd195e2a)

Pattern `[a-z]` with `IGNORECASE` flag can match to some non-ASCII characters.

Straightforward solution for this is using `IGNORECASE | ASCII` flag.
But users may subclass `Template` and override only `idpattern`. So we want to
avoid changing `Template.flags`.

So this commit uses local flag `-i` for `idpattern` and change `[a-z]` to `[a-zA-Z]`.
(cherry picked from commit b22273ec)

When regrtest in run inside IDLE, sys.stdout and sys.stderr are not
TextIOWrapper objects and have no file descriptor associated:
sys.stderr.fileno() raises io.UnsupportedOperation.

Disable faulthandler and don't replace sys.stdout in that case.
(cherry picked from commit ccef8239)

Reported by John Gamboa on docs@p.o at
https://mail.python.org/pipermail/docs/2017-June/031942.html

(cherry picked from commit 92551044)

(cherry picked from commit de072100)

(cherry picked from commit 0e61e67a)

* stdout and stderr are always opened in text mode
* and they are line-buffered

Initial patch by Gareth Rees.