https://bugs.python.org/issue37814:

> The empty tuple syntax in type annotations, `Tuple[()]`, is not obvious from the examples given in the documentation (I naively expected `Tuple[]` to work); it has been documented in PEP 484 and in mypy, but not in the documentation for the typing module.


https://bugs.python.org/issue37814

Add error number 113 EHOSTUNREACH to get_socket_conn_refused_errs()
of test.support.

The `expand` option was introduced in 2000 in commit fad27aee.
It appears to have been always set since it was committed, and
what it does is tell the code to do something essential.  So,
just always do that, and cut the option.

Also cut the `linebreakprops` option, which isn't consulted anymore.

This file started life as a script, before conversion to a
`unittest` test file.  Clear out some legacies of that conversion
that are a bit confusing about how it works.

Most notably, it's unlikely there's still a good reason to try
to recover from `unicodedata` failing to import -- as there was
when that logic was first added, when the module was very new.
So take that out entirely.  Keep `self.db` working, though, to
avoid a noisy diff.

This causes them to be collapsed by default in diffs shown on GitHub.




https://bugs.python.org/issue37760



Automerge-Triggered-By: @benjaminp

There were 10 copies of this, and almost as many distinct versions of
exactly how it was written.  They're all implementing the same
standard.  Pull them out to the top, so the more interesting logic
that remains becomes easier to read.

- Remove use of replacement text in the script
- Make use of the pyvenv.cfg file for prompt value.
- Add parameters to allow more flexibility
- Make use of the current path, and assumptions about where env puts things, to compensate
- Make the script a bit more 'idiomatic' Powershell
- Add script documentation (Get-Help .\.venv\Scripts\Activate.ps1 shows PS help page now

This should fix the IndexError trying to retrieve `DisplayName.display_name` and `DisplayName.value` when the `value` is basically an empty string.




https://bugs.python.org/issue32178

DeprecationWarning will continue to be emitted for invalid escape
sequences in string and bytes literals just as it did in 3.7.

SyntaxWarning may be emitted in the future. But per mailing list
discussion, we don't yet know when because we haven't settled on how to
do so in a non-disruptive manner.

(Applies 4c5b6bac2408f879231c7cd38d67657dd4804e7c to the master branch).
(This is https://github.com/python/cpython/pull/15142 for master/3.9)


https://bugs.python.org/issue32912



Automerge-Triggered-By: @gpshead

This fixes an inconsistency between the Python and C implementations of
the datetime module. The pure python version of the code was not
accepting offsets greater than 23:59 but less than 24:00. This is an
accidental legacy of the original implementation, which was put in place
before tzinfo allowed sub-minute time zone offsets.

GH-14878

Use warnings.filterwarnings() when importing the deprecated parser
module.

@pablogsal 


https://bugs.python.org/issue37268



Automerge-Triggered-By: @pablogsal

Use a tighter scope temporary variable to help register allocation.
1% speedup for large string.

Use PyDict_SetItemDefault() for memoizing keys.
At most 4% speedup when the cache hit ratio is low.

They now return NotImplemented for unsupported type of the other operand.

* Edits for readability and grammar

bpo-37004: Documented asymmetry of string arguments in difflib.SequenceMatcher for ratio method (GH-13482)



https://bugs.python.org/issue37004

Avoid the creation of unused int object for each line.

* add a missing ``.. availability::`` reST explicit markup;
* more consistent "see man page" sentences.

Tim and Dan were authors for GH-11847