…_init__() more than once (GH-3968) (#4301)

(cherry picked from commit e56ab74)

…or object is uninitialized (GH-3958) (#4303)

(cherry picked from commit edb13ae)

(cherry picked from commit 4135c89)

(cherry picked from commit cb04f75)

By accident the size of the empty dict keys object matched the
size of values array.
(cherry picked from commit 39a156c)

…GH-4304) (#4321)

* fix doc for multiprocessing.connection.Client

The authenticate argument does not exist on either Client or Listener:
- https://github.com/python/cpython/blob/master/Lib/multiprocessing/connection.pyGH-L483 (master)
- https://github.com/python/cpython/blob/3.6/Lib/multiprocessing/connection.pyGH-L478 (3.6)
- https://github.com/python/cpython/blob/3.5/Lib/multiprocessing/connection.pyGH-L478 (3.5)
- https://github.com/python/cpython/blob/3.4/Lib/multiprocessing/connection.pyGH-L487 (3.4)
The documentation also claimed that these functions will call `current_process().auth_key`, for which I could find no evidence in the code. I rewrote the documentation to reflect the actual behavior.

Also made some small changes to vary sentence structure.
(cherry picked from commit 1e5d54c)

…H-4319) (#4320)

(cherry picked from commit 22b1128)

…H-4314) (#4322)

* bpo-31970: Reduce performance overhead of asyncio debug mode..
(cherry picked from commit 921e943)

(cherry picked from commit 5a66c8a)

… during waiting (GH-3813) (#4326)

(cherry picked from commit c62f0cb)

…H-4255). (#4340)

(cherry picked from commit 0de9285)

(cherry picked from commit 01ae58d)

…s. (GH-4235) (#4352)

* Fix compilation of the socket module on NetBSD 8.
* Fix the assertion failure or reading arbitrary data when parse
  a AF_BLUETOOTH address on NetBSD and DragonFly BSD.
* Fix other potential errors and make the code more reliable.
(cherry picked from commit d318715)

…Pure Python (GH-4176) (#4356)

(cherry picked from commit 191e993)

…H-4359) (#4360)

(cherry picked from commit 5e0df74)

(cherry picked from commit e184cfd)

It can be removed after python/peps@c28890f
(cherry picked from commit 7c9da3e)

(cherry picked from commit e197a85)

…). (#4379)

(cherry picked from commit e0582a3)

…GH-4350) (#4380)

(cherry picked from commit 92c2ca7)

…enter() (GH-4384) (#4385)

(cherry picked from commit f76231f)

…make_array() (GH-4391) (#4392)

(cherry picked from commit 56935a5)

… (#4389)

(cherry picked from commit 28b6248)

…ite an… (GH-4386) (#4393)

* bpo-32015: Asyncio cycling during simultaneously socket read/write and reconnection

* Tests fix

* Tests fix

* News add

* Add new unit tests.
(cherry picked from commit e1d62e0)

(cherry picked from commit b0b44b4)

(cherry picked from commit 3bda022)

…4401) (#4403)

(cherry picked from commit 6545256)

…Back_Print()). (GH-4289) (#4406)

* Setting sys.tracebacklimit to 0 or less now suppresses printing tracebacks.
* Setting sys.tracebacklimit to None now causes using the default limit.
* Setting sys.tracebacklimit to an integer larger than LONG_MAX now means using
  the limit LONG_MAX rather than the default limit.
* Fixed integer overflows in the case of more than 2**31 traceback items on
  Windows.
* Fixed output errors handling..
(cherry picked from commit edad8ee)

(cherry picked from commit 28607e0)

(cherry picked from commit 6ea20fc)

…H-5570)

It now reads: ...be aware that Python has no control over...
(cherry picked from commit 517da1e)

Co-authored-by: Alexey <forestbiiird@gmail.com>

… (GH-5547)

`arg_name` and `element_index` are defined as `digit`+ instead of `integer`.
(cherry picked from commit 7a561af)

Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>

The PrintNameOffset field of the reparse data buffer
was treated as a number of characters instead of bytes.

(cherry picked from commit 3c34aad)

Co-authored-by: SSE4 <tomskside@gmail.com>

…t. (GH-5639)

GUI test test_file_buttons() only looks at initial ascii-only lines,
but failed on systems where open() defaults to 'ascii' because
readline() internally reads and decodes far enough ahead to encounter
a non-ascii character in CREDITS.txt.
(cherry picked from commit f34e03e)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

…H-5646)

Using the system and place-dependent default encoding for open()
is a bad idea for IDLE's system and location-independent files.
(cherry picked from commit 688722c)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

…uuid module. (GH-5608). (#5654)

(cherry picked from commit da6c3da)


Co-authored-by: Segev Finer <segev208@gmail.com>

… handler. (GH-5636)

(cherry picked from commit b7e2d67)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

…H-3995)

(cherry picked from commit d019bc8)

(cherry picked from commit f0bc645)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

This note incorrectly stated that "Base64 has an expansion factor of 6
to 4" (it is actually 4 to 3). It was decided to remove the note.

(cherry picked from commit 88c38a4)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

# current
if timeout is None:
    timeout = -1
elif timeout <= 0:
    timeout = 0

# changed
if timeout is None:
    timeout = -1
elif timeout < -1:
    timeout = 0

what if "timeout=-1" ?
- currently it would result in being timeout=0