mirror of https://github.com/python/cpython
Make the organization of the body and the summary have parallel structure.
This means I moved the 'new expected features' section to the top of the summary, and made a new section with the same name at the start of the body, turning the previous top level sections there into subsections. I also added a line to the new first summary section for modulespec (pep 451).
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R David Murray
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@ -88,6 +88,17 @@ New syntax features:
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* No new syntax features were added in Python 3.4.
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New expected features for Python implementations:
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* :ref:`Make newly created file descriptors non-inheritable <whatsnew-pep-446>`
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(:pep:`446`).
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* command line option for :ref:`isolated mode <using-on-misc-options>`,
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(:issue:`16499`).
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* :ref:`improvements <codec-handling-improvements>` in the handling of
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codecs that are not text encodings
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* :ref:`A ModuleSpec Type <whatsnew-pep-451>` for the Import System
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(:pep:`451`).
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New library modules:
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* :mod:`asyncio`: New provisonal API for asynchronous IO (:pep:`3156`).
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@ -99,15 +110,6 @@ New library modules:
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* :mod:`statistics`: A basic numerically stable statistics library (:pep:`450`).
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* :mod:`tracemalloc`: Trace Python memory allocations (:pep:`454`).
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New expected features for Python implementations:
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* :ref:`Make newly created file descriptors non-inheritable <whatsnew-pep-446>`
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(:pep:`446`).
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* command line option for :ref:`isolated mode <using-on-misc-options>`,
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(:issue:`16499`).
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* :ref:`improvements <codec-handling-improvements>` in the handling of
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codecs that are not text encodings
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Significantly Improved Library Modules:
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* :ref:`Single-dispatch generic functions <whatsnew-singledispatch>` in
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@ -137,8 +139,11 @@ CPython implementation improvements:
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Please read on for a comprehensive list of user-facing changes.
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New expected features for Python implementations
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================================================
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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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cross-platform mechanism to boostrap the pip installer into Python
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@ -176,7 +181,7 @@ install ``pip`` along with CPython itself.
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.. _whatsnew-pep-446:
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PEP 446: Make newly created file descriptors non-inheritable
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============================================================
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------------------------------------------------------------
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:pep:`446` makes newly created file descriptors :ref:`non-inheritable
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<fd_inheritance>`. New functions and methods:
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@ -194,7 +199,7 @@ PEP 446: Make newly created file descriptors non-inheritable
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.. _codec-handling-improvements:
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Improvements to codec handling
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==============================
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------------------------------
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Since it was first introduced, the :mod:`codecs` module has always been
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intended to operate as a type-neutral dynamic encoding and decoding
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@ -272,10 +277,10 @@ 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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:issue:`17828` and :issue:`19619`)
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.. _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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================================================
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------------------------------------------------
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:pep:`451` provides an encapsulation of the information about a module
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that the import machinery will use to load it, (i.e. a module spec).
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@ -293,24 +298,8 @@ described in the PEP. Existing importers should be updated to implement
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the new methods.
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.. _whatsnew-protocol-4:
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Pickle protocol 4
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=================
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The new :mod:`pickle` protocol addresses a number of issues that were present
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in previous protocols, such as the serialization of nested classes, very
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large strings and containers, or classes whose :meth:`__new__` method takes
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keyword-only arguments. It also brings a couple efficiency improvements.
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.. seealso::
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:pep:`3154` - Pickle protocol 4
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PEP written by Antoine Pitrou and implemented by Alexandre Vassalotti.
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Other Language Changes
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======================
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----------------------
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Some smaller changes made to the core Python language are:
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@ -697,6 +686,25 @@ command did. Worse, the Python3 ``pdb print`` command shadowed the Python3
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(Contributed by Connor Osborn in :issue:`18764`.)
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.. _whatsnew-protocol-4:
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Pickle
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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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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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strings and containers, or classes whose :meth:`__new__` method takes
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keyword-only arguments. It also provides some efficiency improvements.
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.. seealso::
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:pep:`3154` - Pickle protocol 4
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PEP written by Antoine Pitrou and implemented by Alexandre Vassalotti.
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poplib
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------
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