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

Put the most common choice, Run Module, at the top.

* Remove suggestion that is less relevant now that global lookups are much faster
* Add link for installing the recipes

Convert mouse y to line number in the sidebar rather than the text.

The collection's item is now always at the left and
the needle is on the right of ==.

There was a discrepancy between the Python and C implementations.

Add singletons ALWAYS_EQ, LARGEST and SMALLEST in test.support
to test mixed type comparison.

Permanent redirect was explained as a temporary redirect.

* Define THREAD_STACK_SIZE for AIX to pass default recursion limit test

Imports now raise `TypeError` instead of `ValueError` for relative import failures. This makes things consistent between `builtins.__import__` and `importlib.__import__` as well as using a more natural import for the failure.


https://bugs.python.org/issue37444



Automerge-Triggered-By: @brettcannon

Previously pdb checked the $HOME environmental variable
to find the user .pdbrc. If $HOME is not set, the user
.pdbrc would not be found.

Change pdb to use `os.path.expanduser('~')` to determine
the user's home directory. Thus, if $HOME is not set (as
in tox or on Windows), os.path.expanduser('~') falls
back on other techniques for locating the user's home
directory.

This follows pip's implementation for loading .piprc.
Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org>