About 10 IDLE features were implemented as supposedly optional
extensions.  Their different behavior could be confusing or worse for
users and not good for maintenance.  Hence the conversion.

The main difference for users is that user configurable key bindings
for builtin features are now handled uniformly.  Now, editing a binding
in a keyset only affects its value in the keyset.  All bindings are
defined together in the system-specific default keysets in config-
extensions.def.  All custom keysets are saved as a whole in config-
extension.cfg.  All take effect as soon as one clicks Apply or Ok.

The affected events are '<<force-open-completions>>', '<<expand-word>>',
'<<force-open-calltip>>', '<<flash-paren>>', '<<format-paragraph>>',
'<<run-module>>', '<<check-module>>', and '<<zoom-height>>'.  Any
(global) customizations made before 3.6.3 will not affect their keyset-
specific customization after 3.6.3. and vice versa.

Inital patch by Charles Wohlganger, revised by Terry Jan Reedy.

* Working draft without _source

* Re-use itemgetter() instances

* Speed-up calls to __new__() with a pre-bound tuple.__new__()

* Add note regarding string interning

* Remove unnecessary create function wrappers

* Minor sync-ups with PR-2736.  Mostly formatting and f-strings

* Bring-in qualname/__module fix-ups from PR-2736

* Formally remove the verbose flag and _source attribute

* Restore a test of potentially problematic field names

* Restore kwonly_args test but without the verbose option

* Adopt Inada's idea to reuse the docstrings for the itemgetters

* Neaten-up a bit

* Add news blurb

* Serhiy pointed-out the need for interning

* Jelle noticed as missing f on an f-string

* Add whatsnew entry for feature removal

* Accede to request for dict literals instead keyword arguments

* Leave the method.__module__ attribute pointing the actual location of the code

* Improve variable names and add a micro-optimization for an non-public helper function

* Simplify by in-lining reuse_itemgetter()

* Arrange steps in more logical order

* Save docstring in local cache instead of interning

getstate and setstate are instance methods, same as encode and reset.

test.support.HOST should be "localhost" as it was in the past. See the bpo-29639.

Tests that need the IP address should use HOSTv4 (added) or the existing HOSTv6 constant.

This changes the definition and fixes tests that needed updating to deal with HOST being
the hostname rather than the hardcoded IP address.

This is only the first step in addressing https://bugs.python.org/issue29639.

* Fix #26669

* Modify NaN check function and error message

* Fix pytime.c when arg is nan

* fix whitespace

* bpo-31392: Improve SSL error handling on Windows

* Remove unnecessary Windows mention in NEWS

b3ad0e51 broke backwards compatibility with OpenSSL < 1.0.2.
Signed-off-by: Christian Heimes <christian@python.org>

Allow configure --with-lto to apply to all builds, not just profile-opt builds.

Whether this is actually useful or not must be determined by the person
building CPython using their own toolchain.

My own quick test on x86_64 Debian 9 (gcc 6.3, binutils 2.28) seemed
to suggest that it wasn't, but I expect better toolchains can or will exist
at some point.  The point is to allow it at all.

The SSL module now raises SSLCertVerificationError when OpenSSL fails to
verify the peer's certificate. The exception contains more information about
the error.

Original patch by Chi Hsuan Yen
Signed-off-by: Christian Heimes <christian@python.org>

* group the (stateful) runtime globals into various topical structs
* consolidate the topical structs under a single top-level _PyRuntimeState struct
* add a check-c-globals.py script that helps identify runtime globals

Other globals are excluded (see globals.txt and check-c-globals.py).

* bpo-29136: Add TLS 1.3 support

TLS 1.3 introduces a new, distinct set of cipher suites. The TLS 1.3
cipher suites don't overlap with cipher suites from TLS 1.2 and earlier.
Since Python sets its own set of permitted ciphers, TLS 1.3 handshake
will fail as soon as OpenSSL 1.1.1 is released. Let's enable the common
AES-GCM and ChaCha20 suites.

Additionally the flag OP_NO_TLSv1_3 is added. It defaults to 0 (no op) with
OpenSSL prior to 1.1.1. This allows applications to opt-out from TLS 1.3
now.
Signed-off-by: Christian Heimes <christian@python.org>

Remove redundant PyUnicode_Check call. Use a static table for checking chars.

Rather than requiring the path to blurb and/or sphinx-build to be specified to the make rule, enhance the Doc/Makefile to look for each first in a virtual environment created by make venv and, if not found, look on the normal process PATH. This allows the Doc/Makefile to take advantage of an installed spinx-build or blurb and, thus, do the right thing most of the time. Also, make the directory for the venv be configurable and document the `make venv` target.

f_trace_lines: enable/disable line trace events
f_trace_opcodes: enable/disable opcode trace events

These are intended primarily for testing of the interpreter
itself, as they make it much easier to emulate signals
arriving at unfortunate times.

To match the documentation updates already made.
Also renames the local variable used within to match
what it actually holds.

* bpo-27340: Use memoryview in SSLSocket.sendall()

SSLSocket.sendall() now uses memoryview to create slices of data. This fix
support for all bytes-like object. It is also more efficient and avoids
costly copies.
Signed-off-by: Christian Heimes <christian@python.org>

* Cast view to bytes, fix typo
Signed-off-by: Christian Heimes <christian@python.org>

Signed-off-by: Christian Heimes <christian@python.org>

* bpo-31270: Simplify documentation of itertools.zip_longest

* Use repeat(). Track num_active.

Signed-off-by: Christian Heimes <christian@python.org>

* Fix ZeroMQSocketListener and ZeroMQSocketHandler examples

* Use send_json and recv_json to simplify pyzmq interfacing

* Add News entry

Also provide a solution if the user wants to keep multiple blank lines.

* Remove Setup.config
* Always define WITH_THREAD for compatibility.

Signed-off-by: Christian Heimes <christian@python.org>

This fixes the gcc "warning: this use of "defined" may not be portable [-Wexpansion-to-defined]"

See discussion in http://bugs.python.org/issue29505