(patch by Nick Coghlan)

* Revert "Fixed a typo in the HTMLParser.feed docstrings. The docstring started with an 'r', like a The docstring was correct. I read the patch in opposite direction, as *adding* the "r" prefix.
This reverts commit 5ba18503.

* Improves test_underpth_nosite_file to reveal why it fails.

* Enable building with Windows 10 SDK.

* Fix WinSDK detection

* Fix initialization on Windows when a ._pth file exists.

* Fix tabs

* Adds comment about Py_GetPath call.

Drop handshake_done and peer_cert members from PySSLSocket struct. The
peer certificate can be acquired from *SSL directly.
SSL_get_peer_certificate() does not trigger any network activity.
Instead of manually tracking the handshake state, simply use
SSL_is_init_finished().

In combination these changes fix auto-handshake for non-blocking
MemoryBIO connections.
Signed-off-by: Christian Heimes <christian@python.org>

use faulthandler._sigsegv() and ctypes.util.find_library('c')

Fixed a typo in the HTMLParser.feed docstrings. The docstring started with an 'r', like a rawstring. (#1759)

* Allow FileInput to accept a single PathLike object as a parameter for `files`

Fixes

bpo-30432: FileInput doesn't accept PathLike objects for file names

* Address comments from @ambv

PEP 432 specifies a number of large changes to interpreter startup code, including exposing a cleaner C-API. The major changes depend on a number of smaller changes. This patch includes all those smaller changes.

Some objects (like test mocks) auto-generate new objects on
attribute access, which can lead to an infinite loop in
inspect.unwrap().

Ensuring references are retained to otherwise temporary objects
and capping the size of the memo dict turns this case into a
conventional exception instead.

head_lock could be held by another thread when fork happened. We should
reset it to avoid deadlock.

Note: this doesn't unpack f-strings into the underlying JoinedStr AST.

Ideally we'd fully implement JoinedStr here but given its additional
complexity, I think this is worth bandaiding as is. This unblocks tools like
https://github.com/google/yapf to format 3.6 syntax using f-strings.

Defaults to 'no', but as before assertions are implied by --with-pydebug.

This partially solves bpo-23894.

Ran the docstrings through spell checker, and fixed spelling issues.

There was an unneeded space before a closing parenthesis in the `unittest.mock` documentation.

bpo-29619: Do not use HAVE_LARGEFILE_SUPPORT for type conversions (GH-1666).

* Use only the LongLong form for the conversions.

Increases coverage to 99%

* #30014: refactor poll-related classes so that poll(), epoll() and devpoll() share the same methods for register(), unregister(), close() and select()

* remove unused attribute

* use specific class attributes instead of select.* constants

* have all classes except SelectSelector a _selector attribute

* BaseException -> Exception

* be explicit in defining a close() method only for selectors which have it

* fix AttributeError

Based on patches by Duane Griffin and Tim Mitchell.

Original patch by Dennis Mårtensson.

Based on patch by Eryk Sun.

Workaround for a regrtest bug.

* Replaced list(<generator expression>) with list comprehension
* Replaced dict(<generator expression>) with dict comprehension
* Replaced set(<list literal>) with set literal
* Replaced builtin func(<list comprehension>) with func(<generator
  expression>) when supported (e.g. any(), all(), tuple(), min(), &
  max())