Tweaks to What's New and some referenced docs
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@ -100,7 +100,7 @@ Type Objects
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.. c:function:: void* PyType_GetSlot(PyTypeObject *type, int slot)
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.. c:function:: void* PyType_GetSlot(PyTypeObject *type, int slot)
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Return the function pointer stored int the given slot. If the
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Return the function pointer stored in the given slot. If the
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result is *NULL*, this indicates that either the slot is *NULL*,
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result is *NULL*, this indicates that either the slot is *NULL*,
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or that the function was called with invalid parameters.
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or that the function was called with invalid parameters.
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Callers will typically cast the result pointer into the appropriate
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Callers will typically cast the result pointer into the appropriate
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@ -107,7 +107,8 @@ creation according to their needs, the :class:`EnvBuilder` class.
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upgraded in-place (defaults to ``False``).
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upgraded in-place (defaults to ``False``).
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* ``with_pip`` -- a Boolean value which, if true, ensures pip is
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* ``with_pip`` -- a Boolean value which, if true, ensures pip is
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installed in the virtual environment
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installed in the virtual environment. This uses :mod:`ensurepip` with
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the ``--default-pip`` option.
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.. versionchanged:: 3.4
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.. versionchanged:: 3.4
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Added the ``with_pip`` parameter
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Added the ``with_pip`` parameter
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@ -69,8 +69,9 @@ For full details, see the
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`changelog <http://docs.python.org/3.4/whatsnew/changelog.html>`_.
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`changelog <http://docs.python.org/3.4/whatsnew/changelog.html>`_.
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.. note:: Prerelease users should be aware that this document is currently in
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.. note:: Prerelease users should be aware that this document is currently in
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draft form. It will be updated substantially as Python 3.4 moves towards
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draft form. While it should be close to complete for the Python 3.4
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release, so it's worth checking back even after reading earlier versions.
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release candidates, adjustments and additions to the document may be made
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up until the final release.
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.. seealso::
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.. seealso::
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@ -132,10 +133,9 @@ Significantly Improved Library Modules:
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a new :mod:`~email.message.Message` subclass
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a new :mod:`~email.message.Message` subclass
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(:class:`~email.contentmanager.EmailMessage`) that :ref:`simplify MIME
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(:class:`~email.contentmanager.EmailMessage`) that :ref:`simplify MIME
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handling <whatsnew_email_contentmanager>` (:issue:`18891`).
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handling <whatsnew_email_contentmanager>` (:issue:`18891`).
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* :mod:`plistlib` has a cleaned up interface and support for binary
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plist files (:issue:`14455`)
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* The :mod:`ipaddress` module API has been declared stable
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* The :mod:`ipaddress` module API has been declared stable
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CPython implementation improvements:
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CPython implementation improvements:
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* :ref:`Safe object finalization <whatsnew-pep-442>` (:pep:`442`).
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* :ref:`Safe object finalization <whatsnew-pep-442>` (:pep:`442`).
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@ -163,9 +163,13 @@ PEP 453: Explicit Bootstrapping of PIP in Python Installations
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--------------------------------------------------------------
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--------------------------------------------------------------
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The new :mod:`ensurepip` module (defined in :pep:`453`) provides a standard
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The new :mod:`ensurepip` module (defined in :pep:`453`) provides a standard
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cross-platform mechanism to boostrap the pip installer into Python
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cross-platform mechanism to bootstrap the pip installer into Python
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installations and virtual environments.
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installations and virtual environments.
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By default, the scripts ``pipX`` and ``pipX.Y`` will be installed (where
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X.Y stands for the version of the Python installation), along with the
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``pip`` Python package and its dependencies.
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The :mod:`venv` module and the :command:`pyvenv` utility make use of this
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The :mod:`venv` module and the :command:`pyvenv` utility make use of this
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module to make ``pip`` readily available in virtual environments. When
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module to make ``pip`` readily available in virtual environments. When
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using the command line interface, ``pip`` is installed by default, while
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using the command line interface, ``pip`` is installed by default, while
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@ -187,12 +191,13 @@ __ http://www.python.org/dev/peps/pep-0453/#recommendations-for-downstream-distr
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.. note::
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.. note::
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The implementation of PEP 453 is still a work in progress. Refer to
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To avoid conflicts between parallel Python 2 and Python 3 installations,
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:issue:`19347` for the progress on additional steps:
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only the versioned ``pip3`` and ``pip3.4`` commands are bootstrapped by
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default when ``ensurepip`` is invoked directly (including by the CPython
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* Having the binary installers install ``pip`` by default
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installers). ``pyvenv`` ensures that the unqualified ``pip`` command is
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* Recommending the use of ``pip`` in the "Installing Python Module"
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made available in virtual environments, and ``pip`` can always be
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documentation.
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invoked via the ``-m`` switch rather than directly to avoid ambiguity on
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systems with multiple Python installations.
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.. seealso::
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.. seealso::
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@ -257,6 +262,11 @@ general purpose convenience functions when appropriate::
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File "<stdin>", line 1, in <module>
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File "<stdin>", line 1, in <module>
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LookupError: 'rot13' is not a text encoding; use codecs.encode() to handle arbitrary codecs
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LookupError: 'rot13' is not a text encoding; use codecs.encode() to handle arbitrary codecs
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>>> open("foo.txt", encoding="hex")
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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LookupError: 'hex' is not a text encoding; use codecs.open() to handle arbitrary codecs
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In a related change, whenever it is feasible without breaking backwards
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In a related change, whenever it is feasible without breaking backwards
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compatibility, exceptions raised during encoding and decoding operations
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compatibility, exceptions raised during encoding and decoding operations
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will be wrapped in a chained exception of the same type that mentions the
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will be wrapped in a chained exception of the same type that mentions the
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@ -308,6 +318,7 @@ in :ref:`binary-transforms` and :ref:`text-transforms`.
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(Contributed by Nick Coghlan in :issue:`7475`, , :issue:`17827`,
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(Contributed by Nick Coghlan in :issue:`7475`, , :issue:`17827`,
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:issue:`17828` and :issue:`19619`)
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:issue:`17828` and :issue:`19619`)
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.. _whatsnew-pep-451:
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.. _whatsnew-pep-451:
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PEP 451: A ModuleSpec Type for the Import System
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PEP 451: A ModuleSpec Type for the Import System
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@ -959,8 +970,6 @@ command did. Worse, the Python3 ``pdb print`` command shadowed the Python3
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pickle
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pickle
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------
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------
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protocol 4
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:mod:`pickle` now supports (but does not use by default) a new pickle protocol,
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:mod:`pickle` now supports (but does not use by default) a new pickle protocol,
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protocol 4. This new protocol addresses a number of issues that were present
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protocol 4. This new protocol addresses a number of issues that were present
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in previous protocols, such as the serialization of nested classes, very large
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in previous protocols, such as the serialization of nested classes, very large
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@ -973,6 +982,14 @@ keyword-only arguments. It also provides some efficiency improvements.
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PEP written by Antoine Pitrou and implemented by Alexandre Vassalotti.
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PEP written by Antoine Pitrou and implemented by Alexandre Vassalotti.
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plistlib
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--------
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:mod:`plistlib` now supports binary plist files, and offers the common
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``load``/``loads``/``dump``/``dumps`` API pattern for serialization formats
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(Contributed by Ronald Oussoren and others in :issue:`14455`).
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poplib
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poplib
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------
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------
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@ -1354,6 +1371,9 @@ and can be used to simplify the process of defining and maintaining
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accurate signatures for builtins and standard library extension modules
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accurate signatures for builtins and standard library extension modules
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implemented in C.
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implemented in C.
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Some standard library extension modules have been converted to use Argument
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Clinic in Python 3.4, and :mod:`inspect` has been updated accordingly.
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.. note::
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.. note::
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The Argument Clinic PEP is not fully up to date with the state of the
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The Argument Clinic PEP is not fully up to date with the state of the
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implementation. This has been deemed acceptable by the release manager
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implementation. This has been deemed acceptable by the release manager
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@ -1369,6 +1389,10 @@ implemented in C.
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Other Build and C API Changes
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Other Build and C API Changes
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-----------------------------
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-----------------------------
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* The new :c:func:`PyType_GetSlot` function has been added to the stable ABI,
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allowing retrieval of function pointers from named type slots when using
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the limited API. (Contributed by Martin von Löwis in :issue:`17162`)
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* The new :c:func:`Py_SetStandardStreamEncoding` pre-initialization API
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* The new :c:func:`Py_SetStandardStreamEncoding` pre-initialization API
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allows applications embedding the CPython interpreter to reliably force
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allows applications embedding the CPython interpreter to reliably force
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a particular encoding and error handler for the standard streams
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a particular encoding and error handler for the standard streams
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