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:class:`weakref.WeakSet`, and :class:`datetime.tzinfo` now copies and
pickles instance attributes implemented as :term:`slots <__slots__>`.
(Contributed by Serhiy Storchaka in :issue:`26579`.)
* Add :option:`-P` command line option and :envvar:`PYTHONSAFEPATH` environment
variable to not prepend a potentially unsafe path to :data:`sys.path` such as
the current directory, the script's directory or an empty string.
* Added a :option:`-P` command line option
and a :envvar:`PYTHONSAFEPATH` environment variable,
which disable the automatic prepending to :data:`sys.path`
of the script's directory when running a script,
or the current directory when using :option:`-c` and :option:`-m`.
This ensures only stdlib and installed modules
are picked up by :keyword:`import`,
and avoids unintentionally or maliciously shadowing modules
with those in a local (and typically user-writable) directory.
(Contributed by Victor Stinner in :gh:`57684`.)
* A ``"z"`` option was added to the format specification mini-language that
coerces negative zero to zero after rounding to the format precision. See
:pep:`682` for more details. (Contributed by John Belmonte in :gh:`90153`.)
* A ``"z"`` option was added to the :ref:`formatspec` that
coerces negative to positive zero after rounding to the format precision.
See :pep:`682` for more details.
(Contributed by John Belmonte in :gh:`90153`.)
* Bytes are no longer accepted on :attr:`sys.path`. Support broke sometime
between Python 3.2 and 3.6 with no one noticing until after Python 3.10.0
was released. Bringing back support would also be problematic due to
interactions between :option:`-b` and :attr:`sys.path_importer_cache` when
there is a mixture of strings and bytes keys.
* Bytes are no longer accepted on :data:`sys.path`. Support broke sometime
between Python 3.2 and 3.6, with no one noticing until after Python 3.10.0
was released. In addition, bringing back support would be problematic due to
interactions between :option:`-b` and :data:`sys.path_importer_cache` when
there is a mixture of :class:`str` and :class:`bytes` keys.
(Contributed by Thomas Grainger in :gh:`91181`.)
Other CPython Implementation Changes
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gh-95913: Copyedit/improve Other Language Changes What's New section #97719
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gh-95913: Copyedit/improve Other Language Changes What's New section #97719
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