ValueError always is raised rather than OverflowError for negative counts.
Shifting zero with non-negative count always returns zero.

if pass `accept={int, NoneType}`.

os.fwalk() is sped up by 2 times by using os.scandir().

unlucky Unicode characters.

an exception raised at the very first of an iterable would cause pools behave abnormally
(swallow the exception or hang)

Add the 'monetary' parameter to format_string so that all
uses of format can be converted to format_string.  Adjust
the documentation accordingly, and add a deprecation
warning when format is used.

bpo-19824
bpo-20314
bpo-12518

The presence of the ``--enable-optimizations`` flag is indicated by the
value of ``$enableval``, but the configure script was checking ``$withval``,
resulting in the ``--enable-optimizations`` flag being effectively ignored.

Instead have gcc be used for the coverage build so gcc is exercised in at least one place.

bpo-23890: unittest.TestCase.assertRaises() now manually breaks a
reference cycle to not keep objects alive longer than expected.

* DOC: clarify documentation for `round`

Clarified that `round` can take a negative value for *ndigits*.

* DOC: remove trailing whitespace in previous commit

remove trailing whitespace in previous commit

Make also minor PEP8 coding style fixes on modified imports.

* Remove unused test file

* Remove duplicated text in sndhdrdata README

Since functions in the os module support path-like objects, explicit
converting Path to str no longer needed.

Now general path-like objects are supported, not just pathlib.Path.

Fast paths in partial.__new__ no longer needed since concatenating with empty
tuple was optimized.

In a future versions of Python this can be an error.