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PEP 813: DPO posting post-post update updates #5194

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warsaw merged 1 commit into from
Oct 24, 2026
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PEP 813: DPO posting post-post update updates #5194

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15 changes: 8 additions & 7 deletions peps/pep-0813.rst
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Expand Up @@ -7,7 +7,8 @@ Type: Standards Track
Created: 07-Nov-2025
Python-Version: 3.16
Post-History: `21-Feb-2026 <https://discuss.python.org/t/pep-813-the-pretty-print-protocol/106242>`__,
`04-Mar-2026 <https://discuss.python.org/t/pep-813-the-pretty-print-protocol/106242/79>`__
`04-Mar-2026 <https://discuss.python.org/t/pep-813-the-pretty-print-protocol/106242/79>`__,
`24-Oct-2026 <https://discuss.python.org/t/pep-813-the-pretty-print-protocol-round-2/109651>`__


Abstract
Expand Down Expand Up @@ -1217,8 +1218,9 @@ None at this time.
Change History
==============

* `[DD-Mmm-2026] <https://discuss.python.org/t/pep-813-the-pretty-print-protocol/106242/[NNN]>`__
* `24-Oct-2026 <https://discuss.python.org/t/pep-813-the-pretty-print-protocol-round-2/109651>`__

* Add a new default printer, ``pprint.Printer``, and leave ``pprint.PrettyPrinter`` unchanged.
* ``__pprint__()`` describes an object's structure, and the printer makes all layout decisions.
* Section markers ``pprint.VALUES``, ``pprint.KWARGS`` and ``pprint.ITEMS`` say how tuples are read,
replacing the reading of tuples by their shape and the "false-y" name for positional tuple values.
Expand All @@ -1228,13 +1230,12 @@ Change History
own vocabulary.
* Add ``pprint.decompose()``, and the ``pprint.LEAF`` sentinel that it returns for a leaf.
* Defer a table of markers in the default printer, and a way to change the default printer.
* Add ``pprint.DescriptionType`` for annotating ``__pprint__()`` methods.
* Add a ``hints`` attribute to ``pprint.Layout``, for particular printers.
* Add ``pprint.DescriptionType`` for type annotating ``__pprint__()`` methods.
* Add an optional ``hints`` attribute to ``pprint.Layout``, which can be used by third-party printers.
* Add a ``hug`` attribute to ``pprint.Layout``, so that ``defaultdict`` and similar types keep
``PrettyPrinter``'s layout.
* Add a new default printer, ``pprint.Printer``, and leave ``pprint.PrettyPrinter`` unchanged.
* A printer returns an iterable of lines, and ``!p`` joins them with ``'\n'``.
* Specify how the default printer lays out, sorts and limits the depth of nested objects, including keys
* Specify how the default printer lays out, sorts, and limits the depth of nested objects, including keys
that wrap.
* The default printer's ``expand`` option takes a ``pprint.Expand`` member: ``NEVER``, ``FIT`` or
``ALWAYS``. Its defaults are ``width=78``, ``indent=4`` and ``expand=Expand.FIT``.
Expand All @@ -1245,7 +1246,7 @@ Change History
* The default printer's ``number_format`` option replaces ``underscore_numbers``.
* Specify when an inherited ``__pprint__()`` is used, and explain why.
* :mod:`dataclasses` and :func:`~collections.namedtuple` generate ``__pprint__()`` methods.
* The ``!p`` format spec is a single replacement field, ``f'{obj!p:{printer}}'``, whose value is called
* The ``!p`` format spec can be a single replacement field, ``f'{obj!p:{printer}}'``, whose value is called
without first being converted to a string. Any other spec is a :exc:`SyntaxError`.
* A printer of ``None`` means the default printer, in f-strings, t-strings and ``PyObject_Pretty()``.
* In ``str.format()``, a format spec after ``!p`` pads the pretty printed string.
Expand Down
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