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bpo-32996: Improve What's New in 3.7. (#5983)

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Doc/library/cgi.rst
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......@@ -289,11 +289,13 @@ algorithms implemented in this module in other circumstances.
This function is deprecated in this module. Use :func:`urllib.parse.parse_qs`
instead. It is maintained here only for backward compatibility.
.. function:: parse_qsl(qs, keep_blank_values=False, strict_parsing=False)
This function is deprecated in this module. Use :func:`urllib.parse.parse_qsl`
instead. It is maintained here only for backward compatibility.
.. function:: parse_multipart(fp, pdict, encoding="utf-8")
Parse input of type :mimetype:`multipart/form-data` (for file uploads).
......@@ -309,6 +311,10 @@ algorithms implemented in this module in other circumstances.
uploaded --- in that case, use the :class:`FieldStorage` class instead
which is much more flexible.
.. versionchanged:: 3.7
Added the *encoding* parameter. For non-file fields, the value is now
a list of strings, not bytes.
.. function:: parse_header(string)
......
Doc/whatsnew/3.7.rst
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......@@ -91,17 +91,17 @@ rather than ASCII.
The platform support definition in :pep:`11` has also been updated to limit
full text handling support to suitably configured non-ASCII based locales.
As part of this change, the default error handler for ``stdin`` and ``stdout``
is now ``surrogateescape`` (rather than ``strict``) when using any of the
defined coercion target locales (currently ``C.UTF-8``, ``C.utf8``, and
``UTF-8``). The default error handler for ``stderr`` continues to be
``backslashreplace``, regardless of locale.
As part of this change, the default error handler for :data:`~sys.stdin` and
:data:`~sys.stdout` is now ``surrogateescape`` (rather than ``strict``) when
using any of the defined coercion target locales (currently ``C.UTF-8``,
``C.utf8``, and ``UTF-8``). The default error handler for :data:`~sys.stderr`
continues to be ``backslashreplace``, regardless of locale.
Locale coercion is silent by default, but to assist in debugging potentially
locale related integration problems, explicit warnings (emitted directly on
``stderr`` can be requested by setting ``PYTHONCOERCECLOCALE=warn``. This
setting will also cause the Python runtime to emit a warning if the legacy C
locale remains active when the core interpreter is initialized.
:data:`~sys.stderr` can be requested by setting ``PYTHONCOERCECLOCALE=warn``.
This setting will also cause the Python runtime to emit a warning if the
legacy C locale remains active when the core interpreter is initialized.
.. seealso::
......@@ -114,9 +114,9 @@ locale remains active when the core interpreter is initialized.
PEP 553: Built-in breakpoint()
------------------------------
:pep:`553` describes a new built-in called ``breakpoint()`` which makes it
:pep:`553` describes a new built-in called :func:`breakpoint` which makes it
easy and consistent to enter the Python debugger. Built-in ``breakpoint()``
calls ``sys.breakpointhook()``. By default, this latter imports ``pdb`` and
calls :func:`sys.breakpointhook`. By default, this latter imports :mod:`pdb` and
then calls ``pdb.set_trace()``, but by binding ``sys.breakpointhook()`` to the
function of your choosing, ``breakpoint()`` can enter any debugger. Or, the
environment variable :envvar:`PYTHONBREAKPOINT` can be set to the callable of
......@@ -166,12 +166,12 @@ PEP 562: Customization of access to module attributes
It is sometimes convenient to customize or otherwise have control over access
to module attributes. A typical example is managing deprecation warnings.
Typical workarounds are assigning ``__class__`` of a module object to
a custom subclass of :class:`types.ModuleType` or replacing the ``sys.modules``
item with a custom wrapper instance. This procedure is now simplified by
recognizing ``__getattr__`` defined directly in a module that would act like
a normal ``__getattr__`` method, except that it will be defined on module
*instances*.
Typical workarounds are assigning :attr:`~instance.__class__` of a module
object to a custom subclass of :class:`types.ModuleType` or replacing the
:data:`sys.modules` item with a custom wrapper instance. This procedure is
now simplified by recognizing ``__getattr__`` defined directly in a module
that would act like a normal :meth:`__getattr__` method, except that it will
be defined on module *instances*.
.. seealso::
......@@ -217,7 +217,7 @@ following syntax valid::
...
Since this change breaks compatibility, the new behavior can be enabled
on a per-module basis in Python 3.7 using a ``__future__`` import, like
on a per-module basis in Python 3.7 using a :mod:`__future__` import, like
this::
from __future__ import annotations
......@@ -263,7 +263,7 @@ PEP 565: Show DeprecationWarning in ``__main__``
The default handling of :exc:`DeprecationWarning` has been changed such that
these warnings are once more shown by default, but only when the code
triggering them is running directly in the ``__main__`` module. As a result,
triggering them is running directly in the :mod:`__main__` module. As a result,
developers of single file scripts and those using Python interactively should
once again start seeing deprecation warnings for the APIs they use, but
deprecation warnings triggered by imported application, library and framework
......@@ -275,7 +275,7 @@ between three different deprecation warning behaviours:
* :exc:`FutureWarning`: always displayed by default, recommended for warnings
intended to be seen by application end users (e.g. for deprecated application
configuration settings).
* :exc:`DeprecationWarning`: displayed by default only in ``__main__`` and when
* :exc:`DeprecationWarning`: displayed by default only in :mod:`__main__` and when
running tests, recommended for warnings intended to be seen by other Python
developers where a version upgrade may result in changed behaviour or an
error.
......@@ -316,11 +316,11 @@ environment variable are added to control the UTF-8 mode.
PEP 557: Data Classes
---------------------
Adds a new module ``dataclasses``. It provides a class decorator
``dataclass`` which inspects the class's variable annotations (see
Adds a new module :mod:`dataclasses`. It provides a class decorator
:func:`~dataclasses.dataclass` which inspects the class's variable annotations (see
:pep:`526`) and using them, adds methods such as ``__init__``,
``__repr__``, and ``__eq__`` to the class. It is similar to
``typing.NamedTuple``, but also works on classes with mutable
:class:`typing.NamedTuple`, but also works on classes with mutable
instances, among other features.
For example::
......@@ -407,7 +407,8 @@ Other Language Changes
whitespace, not only spaces. (Contributed by Robert Xiao in :issue:`28927`.)
* :exc:`ImportError` now displays module name and module ``__file__`` path when
``from ... import ...`` fails. (Contributed by Matthias Bussonnier in :issue:`29546`.)
``from ... import ...`` fails. (Contributed by Matthias Bussonnier in
:issue:`29546`.)
* Circular imports involving absolute imports with binding a submodule to
a name are now supported.
......@@ -453,7 +454,6 @@ the user intermix options and positional arguments on the command line,
as is possible in many unix commands. It supports most but not all
argparse features. (Contributed by paul.j3 in :issue:`14191`.)
binascii
--------
......@@ -461,7 +461,6 @@ The :func:`~binascii.b2a_uu` function now accepts an optional *backtick*
keyword argument. When it's true, zeros are represented by ``'`'``
instead of spaces. (Contributed by Xiang Zhang in :issue:`30103`.)
calendar
--------
......@@ -469,14 +468,6 @@ The class :class:`~calendar.HTMLCalendar` has new class attributes which ease
the customisation of the CSS classes in the produced HTML calendar.
(Contributed by Oz Tiram in :issue:`30095`.)
cgi
---
:func:`~cgi.parse_multipart` returns the same results as
:class:`~FieldStorage` : for non-file fields, the value associated to a key
is a list of strings, not bytes.
(Contributed by Pierre Quentel in :issue:`29979`.)
contextlib
----------
......@@ -490,8 +481,8 @@ Alexander Mohr and Ilya Kulakov in :issue:`29302`.)
cProfile
--------
cProfile command line now accepts `-m module_name` as an alternative to
script path. (Contributed by Sanyam Khurana in :issue:`21862`.)
:mod:`cProfile` command line now accepts ``-m module_name`` as an alternative
to script path. (Contributed by Sanyam Khurana in :issue:`21862`.)
crypt
-----
......@@ -505,10 +496,11 @@ for hashing. (Contributed by Serhiy Storchaka in :issue:`31702`.)
datetime
--------
Added the :func:`datetime.datetime.fromisoformat` method, which constructs a
:class:`datetime.datetime` object from a string in one of the formats output
by :func:`datetime.datetime.isoformat`. (Contributed by Paul Ganssle in
:issue:`15873`.)
Added the :meth:`datetime.fromisoformat <datetime.datetime.fromisoformat>`
method, which constructs a :class:`~datetime.datetime` object from a string
in one of the formats output by
:meth:`datetime.isoformat <datetime.datetime.isoformat>`.
(Contributed by Paul Ganssle in :issue:`15873`.)
dis
---
......@@ -521,7 +513,7 @@ classes). (Contributed by Serhiy Storchaka in :issue:`11822`.)
distutils
---------
README.rst is now included in the list of distutils standard READMEs and
``README.rst`` is now included in the list of distutils standard READMEs and
therefore included in source distributions.
(Contributed by Ryan Gonzalez in :issue:`11913`.)
......@@ -537,28 +529,29 @@ equivalent to CR.
http.client
-----------
Add Configurable *blocksize* to ``HTTPConnection`` and
``HTTPSConnection`` for improved upload throughput.
Add configurable *blocksize* to :class:`~http.client.HTTPConnection` and
:class:`~http.client.HTTPSConnection` for improved upload throughput.
(Contributed by Nir Soffer in :issue:`31945`.)
http.server
-----------
:class:`~http.server.SimpleHTTPRequestHandler` supports the HTTP
If-Modified-Since header. The server returns the 304 response status if the
``If-Modified-Since`` header. The server returns the 304 response status if the
target file was not modified after the time specified in the header.
(Contributed by Pierre Quentel in :issue:`29654`.)
Add the parameter ``directory`` to the :class:`~http.server.SimpleHTTPRequestHandler`
and the ``--directory`` to the command line of the module :mod:`~http.server`.
With this parameter, the server serves the specified directory, by default it uses the current working directory.
Add the parameter *directory* to the :class:`~http.server.SimpleHTTPRequestHandler`
and the ``--directory`` to the command line of the module :mod:`http.server`.
With this parameter, the server serves the specified directory, by default it
uses the current working directory.
(Contributed by Stéphane Wirtel and Julien Palard in :issue:`28707`.)
hmac
----
The hmac module now has an optimized one-shot :func:`~hmac.digest` function,
which is up to three times faster than :func:`~hmac.HMAC`.
The :mod:`hmac` module now has an optimized one-shot :func:`~hmac.digest`
function, which is up to three times faster than :func:`~hmac.HMAC`.
(Contributed by Christian Heimes in :issue:`32433`.)
importlib
......@@ -570,11 +563,11 @@ support the loading of resource from packages.
locale
------
Added another argument *monetary* in :meth:`format_string` of :mod:`locale`.
Added another argument *monetary* in :func:`~locale.format_string` of :mod:`locale`.
If *monetary* is true, the conversion uses monetary thousands separator and
grouping strings. (Contributed by Garvit in :issue:`10379`.)
The :func:`locale.getpreferredencoding` function now always returns ``'UTF-8'``
The :func:`~locale.getpreferredencoding` function now always returns ``'UTF-8'``
on Android or in the UTF-8 mode (:option:`-X` ``utf8`` option), the locale and
the *do_setlocale* argument are ignored.
......@@ -593,7 +586,7 @@ Serhiy Storchaka in :issue:`28682`.)
Added support for :ref:`file descriptors <path_fd>` in :func:`~os.scandir`
on Unix. (Contributed by Serhiy Storchaka in :issue:`25996`.)
New function :func:`os.register_at_fork` allows registering Python callbacks
New function :func:`~os.register_at_fork` allows registering Python callbacks
to be executed on a process fork. (Contributed by Antoine Pitrou in
:issue:`16500`.)
......@@ -604,7 +597,7 @@ pdb
argument. If given, this is printed to the console just before debugging
begins. (Contributed by Barry Warsaw in :issue:`31389`.)
pdb command line now accepts `-m module_name` as an alternative to
:mod:`pdb` command line now accepts ``-m module_name`` as an alternative to
script file. (Contributed by Mario Corchero in :issue:`32206`.)
py_compile
......@@ -618,7 +611,6 @@ This allows for guaranteeing
files when they are created eagerly. (Contributed by Bernhard M. Wiedemann
in :issue:`29708`.)
re
--
......@@ -642,7 +634,7 @@ method, if the underlying SQLite library is at version 3.6.11 or higher.
ssl
---
The ssl module now uses OpenSSL's builtin API instead of
The :mod:`ssl` module now uses OpenSSL's builtin API instead of
:func:`~ssl.match_hostname` to check host name or IP address. Values
are validated during TLS handshake. Any cert validation error including
a failing host name match now raises :exc:`~ssl.SSLCertVerificationError` and
......@@ -682,10 +674,6 @@ The ssl module has preliminary and experimental support for TLS 1.3 and
OpenSSL 1.1.1. (Contributed by Christian Heimes in :issue:`32947`,
:issue:`20995`, :issue:`29136`, and :issue:`30622`)
:func:`~ssl.wrap_socket` is deprecated. Documentation has been updated to
recommend :meth:`~ssl.SSLContext.wrap_socket` instead.
(Contributed by Christian Heimes in :issue:`28124`.)
:class:`~ssl.SSLSocket` and :class:`~ssl.SSLObject` no longer have a public
constructor. Direct instantiation was never a documented and supported
feature. Instances must be created with :class:`~ssl.SSLContext` methods
......@@ -708,27 +696,24 @@ separately. (Contributed by Barry Warsaw in :issue:`1198569`.)
subprocess
----------
On Windows the default for *close_fds* was changed from :const:`False` to
:const:`True` when redirecting the standard handles. It's now possible to set
*close_fds* to :const:`True` when redirecting the standard handles. See
On Windows the default for *close_fds* was changed from ``False`` to
``True`` when redirecting the standard handles. It's now possible to set
*close_fds* to ``True`` when redirecting the standard handles. See
:class:`subprocess.Popen`.
This means that *close_fds* now defaults to :const:`True` on all supported
platforms.
This means that *close_fds* now defaults to ``True`` on all supported
platforms. (Contributed by Segev Finer in :issue:`19764`.)
sys
---
Added :attr:`sys.flags.dev_mode` flag for the new development mode.
Deprecated :func:`sys.set_coroutine_wrapper` and
:func:`sys.get_coroutine_wrapper`.
tkinter
-------
Added :class:`tkinter.ttk.Spinbox`.
(Contributed by Alan Moore in :issue:`32585`.)
time
----
......@@ -766,11 +751,12 @@ Peterson.)
unittest
--------
Added new command-line option ``-k`` to filter tests to run with a substring or
Unix shell-like pattern. For example, ``python -m unittest -k foo`` runs the
tests ``foo_tests.SomeTest.test_something``, ``bar_tests.SomeTest.test_foo``,
but not ``bar_tests.FooTest.test_something``.
(Contributed by Jonas Haag in :issue:`32071`.)
unittest.mock
-------------
......@@ -779,7 +765,7 @@ The :const:`~unittest.mock.sentinel` attributes now preserve their identity
when they are :mod:`copied <copy>` or :mod:`pickled <pickle>`. (Contributed by
Serhiy Storchaka in :issue:`20804`.)
New function :const:`~unittest.mock.seal` will disable the creation of mock
New function :func:`~unittest.mock.seal` will disable the creation of mock
children by preventing to get or set any new attribute on the sealed mock.
The sealing process is performed recursively. (Contributed by Mario Corchero
in :issue:`30541`.)
......@@ -787,8 +773,8 @@ in :issue:`30541`.)
urllib.parse
------------
:func:`urllib.parse.quote` has been updated from RFC 2396 to RFC 3986,
adding `~` to the set of characters that is never quoted by default.
:func:`urllib.parse.quote` has been updated from :rfc:`2396` to :rfc:`3986`,
adding ``~`` to the set of characters that is never quoted by default.
(Contributed by Christian Theune and Ratnadeep Debnath in :issue:`16285`.)
uu
......@@ -832,26 +818,27 @@ better readability. (Contributed by Stefan Behnel in :issue:`31648`.)
xmlrpc.server
-------------
:meth:`register_function` of :class:`xmlrpc.server.SimpleXMLRPCDispatcher` and
:meth:`register_function` of :class:`~xmlrpc.server.SimpleXMLRPCDispatcher` and
its subclasses can be used as a decorator. (Contributed by Xiang Zhang in
:issue:`7769`.)
zipapp
------
Function :func:`zipapp.create_archive` now accepts an optional *filter*
Function :func:`~zipapp.create_archive` now accepts an optional *filter*
argument to allow the user to select which files should be included in the
archive, and an optional *compressed* argument to generate a compressed
archive.
archive. (Contributed by Irmen de Jong in :issue:`31072`.)
A command line option ``--compress`` has also been added to support
compression.
Function :func:`~zipapp.create_archive` now accepts an optional *compressed*
argument to generate a compressed archive. A command line option
``--compress`` has also been added to support compression.
(Contributed by Zhiming Wang in :issue:`31638`.)
Optimizations
=============
* Added two new opcodes: ``LOAD_METHOD`` and ``CALL_METHOD`` to avoid
* Added two new opcodes: :opcode:`LOAD_METHOD` and :opcode:`CALL_METHOD` to avoid
instantiation of bound method objects for method calls, which results
in method calls being faster up to 20%. (Contributed by Yury Selivanov and
INADA Naoki in :issue:`26110`.)
......@@ -882,8 +869,9 @@ Optimizations
Python 3.6 by about 10% depending on the pattern.
(Contributed by INADA Naoki in :issue:`31671`.)
* :meth:`selectors.EpollSelector.modify`, :meth:`selectors.PollSelector.modify`
and :meth:`selectors.DevpollSelector.modify` may be around 10% faster under
* :meth:`~selectors.BaseSelector.modify` methods of classes
:class:`selectors.EpollSelector`, :class:`selectors.PollSelector`
and :class:`selectors.DevpollSelector` may be around 10% faster under
heavy loads. (Contributed by Giampaolo Rodola' in :issue:`30014`)
* Constant folding is moved from peephole optimizer to new AST optimizer.
......@@ -900,6 +888,7 @@ Optimizations
constructors when not constructing subclasses. (Contributed by Paul Ganssle
in :issue:`32403`)
Build and C API Changes
=======================
......@@ -955,6 +944,16 @@ Build and C API Changes
and access to the UTC singleton with :c:data:`PyDateTime_TimeZone_UTC`.
Contributed by Paul Ganssle in :issue:`10381`.
- The type of results of :c:func:`PyThread_start_new_thread` and
:c:func:`PyThread_get_thread_ident`, and the *id* parameter of
:c:func:`PyThreadState_SetAsyncExc` changed from :c:type:`long` to
:c:type:`unsigned long`.
(Contributed by Serhiy Storchaka in :issue:`6532`.)
- :c:func:`PyUnicode_AsWideCharString` now raises a :exc:`ValueError` if the
second argument is *NULL* and the :c:type:`wchar_t*` string contains null
characters. (Contributed by Serhiy Storchaka in :issue:`30708`.)
Other CPython Implementation Changes
====================================
......@@ -1007,13 +1006,13 @@ Deprecated
- Methods
:meth:`MetaPathFinder.find_module() <importlib.abc.MetaPathFinder.find_module>`
(replaced by
:meth:`MetaPathFinder.find_spec() <importlib.abc.MetaPathFinder.find_spec>`
) and
:meth:`MetaPathFinder.find_spec() <importlib.abc.MetaPathFinder.find_spec>`)
and
:meth:`PathEntryFinder.find_loader() <importlib.abc.PathEntryFinder.find_loader>`
(replaced by
:meth:`PathEntryFinder.find_spec() <importlib.abc.PathEntryFinder.find_spec>`)
both deprecated in Python 3.4 now emit :exc:`DeprecationWarning`. (Contributed
by Matthias Bussonnier in :issue:`29576`)
both deprecated in Python 3.4 now emit :exc:`DeprecationWarning`.
(Contributed by Matthias Bussonnier in :issue:`29576`)
- Using non-integer value for selecting a plural form in :mod:`gettext` is
now deprecated. It never correctly worked. (Contributed by Serhiy Storchaka
......@@ -1024,23 +1023,17 @@ Deprecated
- The :class:`importlib.abc.ResourceLoader` ABC has been deprecated in
favour of :class:`importlib.abc.ResourceReader`.
- Deprecated :func:`sys.set_coroutine_wrapper` and
:func:`sys.get_coroutine_wrapper`.
Changes in the C API
--------------------
- The type of results of :c:func:`PyThread_start_new_thread` and
:c:func:`PyThread_get_thread_ident`, and the *id* parameter of
:c:func:`PyThreadState_SetAsyncExc` changed from :c:type:`long` to
:c:type:`unsigned long`.
(Contributed by Serhiy Storchaka in :issue:`6532`.)
- :c:func:`PyUnicode_AsWideCharString` now raises a :exc:`ValueError` if the
second argument is *NULL* and the :c:type:`wchar_t*` string contains null
characters. (Contributed by Serhiy Storchaka in :issue:`30708`.)
- :func:`ssl.wrap_socket` is deprecated. Use
:meth:`ssl.SSLContext.wrap_socket` instead.
(Contributed by Christian Heimes in :issue:`28124`.)
Windows Only
------------
- The python launcher, (py.exe), can accept 32 & 64 bit specifiers **without**
having to specify a minor version as well. So ``py -3-32`` and ``py -3-64``
become valid as well as ``py -3.7-32``, also the -*m*-64 and -*m.n*-64 forms
......@@ -1054,6 +1047,7 @@ Windows Only
the *short form* list of available specifiers.
(Contributed by Steve Barnes in :issue:`30362`.)
Removed
=======
......@@ -1096,6 +1090,17 @@ API and Feature Removals
:func:`~plistlib.readPlistFromBytes` are now normal dicts. You no longer
can use attribute access to access items of these dictionaries.
* The ``asyncio.windows_utils.socketpair()`` function has been
removed: use directly :func:`socket.socketpair` which is available on all
platforms since Python 3.5 (before, it wasn't available on Windows).
``asyncio.windows_utils.socketpair`` was just an alias to
``socket.socketpair`` on Python 3.5 and newer.
* :mod:`asyncio`: The module doesn't export :mod:`selectors` and
:mod:`_overlapped` modules as ``asyncio.selectors`` and
``asyncio._overlapped``. Replace ``from asyncio import selectors`` with
``import selectors`` for example.
Porting to Python 3.7
=====================
......@@ -1133,27 +1138,18 @@ Changes in the Python API
* :meth:`socketserver.ThreadingMixIn.server_close` now waits until all
non-daemon threads complete. Use daemonic threads by setting
:data:`ThreadingMixIn.daemon_threads` to ``True`` to not wait until threads
complete. (Contributed by Victor Stinner in :issue:`31233`.)
:data:`socketserver.ThreadingMixIn.daemon_threads` to ``True`` to not
wait until threads complete.
(Contributed by Victor Stinner in :issue:`31233`.)
* :meth:`socketserver.ForkingMixIn.server_close` now waits until all
child processes complete. (Contributed by Victor Stinner in :issue:`31151`.)
* The :func:`locale.localeconv` function now sets temporarily the ``LC_CTYPE``
locale to the ``LC_NUMERIC`` locale in some cases.
(Contributed by Victor Stinner in :issue:`31900`.)
* The ``asyncio.windows_utils.socketpair()`` function has been
removed: use directly :func:`socket.socketpair` which is available on all
platforms since Python 3.5 (before, it wasn't available on Windows).
``asyncio.windows_utils.socketpair()`` was just an alias to
``socket.socketpair`` on Python 3.5 and newer.
* :mod:`asyncio`: The module doesn't export :mod:`selectors` and
:mod:`_overlapped` modules as ``asyncio.selectors`` and
``asyncio._overlapped``. Replace ``from asyncio import selectors`` with
``import selectors`` for example.
* :meth:`pkgutil.walk_packages` now raises ValueError if *path* is a string.
* :meth:`pkgutil.walk_packages` now raises :exc:`ValueError` if *path* is a string.
Previously an empty list was returned. (Contributed by Sanyam Khurana in
:issue:`24744`.)
......@@ -1186,6 +1182,11 @@ Changes in the Python API
* The :attr:`struct.Struct.format` type is now :class:`str` instead of
:class:`bytes`. (Contributed by Victor Stinner in :issue:`21071`.)
* :func:`~cgi.parse_multipart` returns now the same results as
:class:`~FieldStorage`: for non-file fields, the value associated to a key
is a list of strings, not bytes.
(Contributed by Pierre Quentel in :issue:`29979`.)
* Due to internal changes in :mod:`socket` you won't be able to
:func:`socket.fromshare` a socket :func:`~socket.socket.share`-ed in older
Python versions.
......@@ -1207,6 +1208,8 @@ Changes in the Python API
avoid a warning escape them with a backslash.
(Contributed by Serhiy Storchaka in :issue:`30349`.)
.. _Unicode Technical Standard #18: https://unicode.org/reports/tr18/
* The result of splitting a string on a :mod:`regular expression <re>`
that could match an empty string has been changed. For example
splitting on ``r'\s*'`` will now split not only on whitespaces as it
......@@ -1246,8 +1249,6 @@ Changes in the Python API
work as expected on all platforms.
(Contributed by Yury Selivanov in :issue:`32331`.)
.. _Unicode Technical Standard #18: https://unicode.org/reports/tr18/
* On Windows the default for the *close_fds* argument of
:class:`subprocess.Popen` was changed from :const:`False` to :const:`True`
when redirecting the standard handles. If you previously depended on handles
......@@ -1276,7 +1277,8 @@ CPython bytecode changes
* Added two new opcodes: :opcode:`LOAD_METHOD` and :opcode:`CALL_METHOD`.
(Contributed by Yury Selivanov and INADA Naoki in :issue:`26110`.)
* Removed the STORE_ANNOTATION opcode.
* Removed the :opcode:`STORE_ANNOTATION` opcode.
(Contributed by Mark Shannon in :issue:`32550`.)
Other CPython implementation changes
......@@ -1293,8 +1295,8 @@ Other CPython implementation changes
(Contributed by Nick Coghlan and Eric Snow as part of :issue:`22257`.)
* Due to changes in the way the default warnings filters are configured,
setting ``Py_BytesWarningFlag`` to a value greater than one is no longer
sufficient to both emit ``BytesWarning`` messages and have them converted
setting :c:data:`Py_BytesWarningFlag` to a value greater than one is no longer
sufficient to both emit :exc:`BytesWarning` messages and have them converted
to exceptions. Instead, the flag must be set (to cause the warnings to be
emitted in the first place), and an explicit ``error::BytesWarning``
warnings filter added to convert them to exceptions.
......
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