When the loop in the pymain_read_conf function in this same file
calls pymain_init_cmdline_argv() a 2nd time, the pymain->command
buffer of wchar_t is overriden and the previously allocated memory
is never freed.

The majority of this PR is tediously passing `end_lineno` and `end_col_offset` everywhere. Here are non-trivial points:
* It is not possible to reconstruct end positions in AST "on the fly", some information is lost after an AST node is constructed, so we need two more attributes for every AST node `end_lineno` and `end_col_offset`.
* I add end position information to both CST and AST.  Although it may be technically possible to avoid adding end positions to CST, the code becomes more cumbersome and less efficient.
* Since the end position is not known for non-leaf CST nodes while the next token is added, this requires a bit of extra care (see `_PyNode_FinalizeEndPos`). Unless I made some mistake, the algorithm should be linear.
* For statements, I "trim" the end position of suites to not include the terminal newlines and dedent (this seems to be what people would expect), for example in
  ```python
  class C:
      pass

  pass
  ```
  the end line and end column for the class definition is (2, 8).
* For `end_col_offset` I use the common Python convention for indexing, for example for `pass` the `end_col_offset` is 4 (not 3), so that `[0:4]` gives one the source code that corresponds to the node.
* I added a helper function `ast.get_source_segment()`, to get source text segment corresponding to a given AST node. It is also useful for testing.

An (inevitable) downside of this PR is that AST now takes almost 25% more memory. I think however it is probably justified by the benefits.

* Disable x87 control word for non-x86 targets

On msvc, x87 control word is only available on x86 target. Need to disable it for other targets to prevent compiling problems.

* Include immintrin.h on x86 and x64 only

Immintrin.h is only available on x86 and x64. Need to disable it for other targets to prevent compiling problems.

https://bugs.python.org/issue35782

PermissionError can be raised if there are directories in the $PATH that are not accessible
when using posix_spawnp.

Fix sparse file tests of test_tarfile on ppc64le with the tmpfs
filesystem.

Fix the function testing if the filesystem supports sparse files:
create a file which contains data and "holes", instead of creating a
file which contains no data.

tmpfs effective block size is a page size (tmpfs lives in the page
cache). RHEL uses 64 KiB pages on aarch64, ppc64 and ppc64le, only
s390x and x86_64 use 4 KiB pages, whereas the test punch holes of
4 KiB.

test.pythoninfo: Add resource.getpagesize().

* Allow repeated deletion of unittest.mock.Mock attributes

* fixup! Allow repeated deletion of unittest.mock.Mock attributes

* fixup! fixup! Allow repeated deletion of unittest.mock.Mock attributes

It previously deleted Window => Zoom Height by mistake.
(Zoom Height is now on the Options menu).  On Mac, the settings
dialog is accessed via Preferences on the IDLE menu.

Document http.client.parse_headers

Make ssl tests less strict and also accept TLSv1 as system default. The
changes unbreaks test_min_max_version on Fedora 29.
Signed-off-by: Christian Heimes <christian@python.org>

'Untitled' violates the PEP 8 standard for .py files

Tix was deprecated in 3.6 and the doc is wrong.  New users should use ttk.

Added test for weakreferencing a uuid.UUID object.

Add a deprecated warning for the threading.Thread.isAlive() method.

Typo fix for method doc, I'm pretty sure coro is meant, because there's no consumer threads for thread-unsafe queue.

Most probably this piece of doc was copied from `queue.Queue`

There's not BPO bug for this, afaik.

While the introduction of ModuleNotFoundError was fully backwards
compatible on the import API consumer side, folks providing alternative
implementations of `__import__` need to make an update to be
forward compatible with clients that start relying on the new subclass.



https://bugs.python.org/issue35486

This reverts commit 07858894.

The subprocess module can now use the os.posix_spawnp() function,
if it is available, to locate the program in the PATH.

Add a new os.posix_spawnp() function.

The subprocess module can now use the os.posix_spawn() function
in some cases for better performance. Currently, it is only used on macOS
and Linux (using glibc 2.24 or newer) if all these conditions are met:

* executable path contains a directory
* close_fds=False
* preexec_fn, pass_fds, cwd, stdin, stdout, stderr
  and start_new_session parameters are not set
Co-authored-by: Joannah Nanjekye <nanjekyejoannah@gmail.com>

Fix a NULL pointer deref in ssl module. The cert parser did not handle CRL
distribution points with empty DP or URI correctly. A malicious or buggy
certificate can result into segfault.
Signed-off-by: Christian Heimes <christian@python.org>



https://bugs.python.org/issue35746

asyncio.ProactorEventLoop now catchs and logs send errors when the
self-pipe is full: BaseProactorEventLoop._write_to_self() now catchs
and logs OSError exceptions, as done by
BaseSelectorEventLoop._write_to_self().

Handle the case of an empty module name in PYTHONBREAKPOINT.

Fixes a regression introduced in bpo-34756.

Add repr(self) to the log to display the number of pending overlapped
in the log.

IocpProactor.close() now uses time to decide when to log: wait 1
second before the first log, then log every second. Log also the
number of seconds since close() was called.

Show correct number of repeats.

Previously, calling the strftime() method on a datetime object with a
trailing '%' in the format string would result in an exception. However,
this only occured when the datetime C module was being used; the python
implementation did not match this behavior. Datetime is now PEP-399
compliant, and will not throw an exception on a trailing '%'.

IDLE's test_squeezer.SqueezerTest.test_reload, added for issue 35196,
failed on both Gentoo buildbots.