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<h1 class="page-title">PEP 623 – Remove wstr from Unicode</h1>
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<dl class="rfc2822 field-list simple">
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<dt class="field-odd">Author<span class="colon">:</span></dt>
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<dd class="field-odd">Inada Naoki <songofacandy at gmail.com></dd>
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<dt class="field-even">BDFL-Delegate<span class="colon">:</span></dt>
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<dd class="field-even">Victor Stinner <vstinner at python.org></dd>
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<dt class="field-odd">Discussions-To<span class="colon">:</span></dt>
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<dd class="field-odd"><a class="reference external" href="https://mail.python.org/archives/list/python-dev@python.org/thread/BO2TQHSXWL2RJMINWQQRBF5LANDDJNHH/">Python-Dev thread</a></dd>
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<dt class="field-even">Status<span class="colon">:</span></dt>
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<dd class="field-even"><abbr title="Accepted and implementation complete, or no longer active">Final</abbr></dd>
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<dt class="field-odd">Type<span class="colon">:</span></dt>
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<dd class="field-odd"><abbr title="Normative PEP with a new feature for Python, implementation change for CPython or interoperability standard for the ecosystem">Standards Track</abbr></dd>
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<dt class="field-even">Created<span class="colon">:</span></dt>
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<dd class="field-even">25-Jun-2020</dd>
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<dt class="field-odd">Python-Version<span class="colon">:</span></dt>
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<dd class="field-odd">3.10</dd>
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<dt class="field-even">Resolution<span class="colon">:</span></dt>
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<dd class="field-even"><a class="reference external" href="https://mail.python.org/archives/list/python-dev@python.org/thread/VQKDIZLZ6HF2MLTNCUFURK2IFTXVQEYA/">Python-Dev thread</a></dd>
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</dl>
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<hr class="docutils" />
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<section id="contents">
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<details><summary>Table of Contents</summary><ul class="simple">
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<li><a class="reference internal" href="#abstract">Abstract</a></li>
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<li><a class="reference internal" href="#motivation">Motivation</a><ul>
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<li><a class="reference internal" href="#memory-usage">Memory usage</a></li>
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<li><a class="reference internal" href="#runtime-overhead">Runtime overhead</a></li>
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<li><a class="reference internal" href="#simplicity">Simplicity</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#rationale">Rationale</a><ul>
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<li><a class="reference internal" href="#python-4-0-is-not-scheduled-yet">Python 4.0 is not scheduled yet</a></li>
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<li><a class="reference internal" href="#python-2-reached-eol">Python 2 reached EOL</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#plan">Plan</a><ul>
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<li><a class="reference internal" href="#python-3-9">Python 3.9</a></li>
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<li><a class="reference internal" href="#python-3-10">Python 3.10</a></li>
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<li><a class="reference internal" href="#python-3-12">Python 3.12</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#discussion">Discussion</a></li>
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<li><a class="reference internal" href="#references">References</a></li>
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<li><a class="reference internal" href="#copyright">Copyright</a></li>
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</ul>
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</details></section>
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<section id="abstract">
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<h2><a class="toc-backref" href="#abstract" role="doc-backlink">Abstract</a></h2>
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<p><a class="pep reference internal" href="../pep-0393/" title="PEP 393 – Flexible String Representation">PEP 393</a> deprecated some unicode APIs, and introduced <code class="docutils literal notranslate"><span class="pre">wchar_t</span> <span class="pre">*wstr</span></code>,
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and <code class="docutils literal notranslate"><span class="pre">Py_ssize_t</span> <span class="pre">wstr_length</span></code> in the Unicode structure to support
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these deprecated APIs.</p>
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<p>This PEP is planning removal of <code class="docutils literal notranslate"><span class="pre">wstr</span></code>, and <code class="docutils literal notranslate"><span class="pre">wstr_length</span></code> with
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deprecated APIs using these members by Python 3.12.</p>
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<p>Deprecated APIs which doesn’t use the members are out of scope because
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they can be removed independently.</p>
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</section>
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<section id="motivation">
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<h2><a class="toc-backref" href="#motivation" role="doc-backlink">Motivation</a></h2>
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<section id="memory-usage">
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<h3><a class="toc-backref" href="#memory-usage" role="doc-backlink">Memory usage</a></h3>
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<p><code class="docutils literal notranslate"><span class="pre">str</span></code> is one of the most used types in Python. Even most simple ASCII
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strings have a <code class="docutils literal notranslate"><span class="pre">wstr</span></code> member. It consumes 8 bytes per string on 64-bit
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systems.</p>
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</section>
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<section id="runtime-overhead">
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<h3><a class="toc-backref" href="#runtime-overhead" role="doc-backlink">Runtime overhead</a></h3>
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<p>To support legacy Unicode object, many Unicode APIs must call
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<code class="docutils literal notranslate"><span class="pre">PyUnicode_READY()</span></code>.</p>
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<p>We can remove this overhead too by dropping support of legacy Unicode
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object.</p>
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</section>
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<section id="simplicity">
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<h3><a class="toc-backref" href="#simplicity" role="doc-backlink">Simplicity</a></h3>
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<p>Supporting legacy Unicode object makes the Unicode implementation more
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complex.
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Until we drop legacy Unicode object, it is very hard to try other
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Unicode implementation like UTF-8 based implementation in PyPy.</p>
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</section>
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</section>
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<section id="rationale">
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<h2><a class="toc-backref" href="#rationale" role="doc-backlink">Rationale</a></h2>
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<section id="python-4-0-is-not-scheduled-yet">
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<h3><a class="toc-backref" href="#python-4-0-is-not-scheduled-yet" role="doc-backlink">Python 4.0 is not scheduled yet</a></h3>
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<p><a class="pep reference internal" href="../pep-0393/" title="PEP 393 – Flexible String Representation">PEP 393</a> introduced efficient internal representation of Unicode and
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removed border between “narrow” and “wide” build of Python.</p>
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<p><a class="pep reference internal" href="../pep-0393/" title="PEP 393 – Flexible String Representation">PEP 393</a> was implemented in Python 3.3 which is released in 2012. Old
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APIs were deprecated since then, and the removal was scheduled in
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Python 4.0.</p>
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<p>Python 4.0 was expected as next version of Python 3.9 when <a class="pep reference internal" href="../pep-0393/" title="PEP 393 – Flexible String Representation">PEP 393</a>
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was accepted. But the next version of Python 3.9 is Python 3.10,
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not 4.0. This is why this PEP schedule the removal plan again.</p>
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</section>
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<section id="python-2-reached-eol">
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<h3><a class="toc-backref" href="#python-2-reached-eol" role="doc-backlink">Python 2 reached EOL</a></h3>
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<p>Since Python 2 didn’t have <a class="pep reference internal" href="../pep-0393/" title="PEP 393 – Flexible String Representation">PEP 393</a> Unicode implementation, legacy
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APIs might help C extension modules supporting both of Python 2 and 3.</p>
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<p>But Python 2 reached the EOL in 2020. We can remove legacy APIs kept
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for compatibility with Python 2.</p>
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</section>
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</section>
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<section id="plan">
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<h2><a class="toc-backref" href="#plan" role="doc-backlink">Plan</a></h2>
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<section id="python-3-9">
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<h3><a class="toc-backref" href="#python-3-9" role="doc-backlink">Python 3.9</a></h3>
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<p>These macros and functions are marked as deprecated, using
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<code class="docutils literal notranslate"><span class="pre">Py_DEPRECATED</span></code> macro.</p>
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<ul class="simple">
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<li><code class="docutils literal notranslate"><span class="pre">Py_UNICODE_WSTR_LENGTH()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GET_SIZE()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GetSize()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GET_DATA_SIZE()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AS_UNICODE()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AS_DATA()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AsUnicode()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">_PyUnicode_AsUnicode()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AsUnicodeAndSize()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_FromUnicode()</span></code></li>
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</ul>
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</section>
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<section id="python-3-10">
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<h3><a class="toc-backref" href="#python-3-10" role="doc-backlink">Python 3.10</a></h3>
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<ul class="simple">
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<li>Following macros, enum members are marked as deprecated.
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<code class="docutils literal notranslate"><span class="pre">Py_DEPRECATED(3.10)</span></code> macro are used as possible. But they
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are deprecated only in comment and document if the macro can
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not be used easily.<ul>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_WCHAR_KIND</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_READY()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_IS_READY()</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_IS_COMPACT()</span></code></li>
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</ul>
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</li>
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<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_FromUnicode(NULL,</span> <span class="pre">size)</span></code> and
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<code class="docutils literal notranslate"><span class="pre">PyUnicode_FromStringAndSize(NULL,</span> <span class="pre">size)</span></code> emit
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<code class="docutils literal notranslate"><span class="pre">DeprecationWarning</span></code> when <code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre">></span> <span class="pre">0</span></code>.</li>
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<li><code class="docutils literal notranslate"><span class="pre">PyArg_ParseTuple()</span></code> and <code class="docutils literal notranslate"><span class="pre">PyArg_ParseTupleAndKeywords()</span></code> emit
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<code class="docutils literal notranslate"><span class="pre">DeprecationWarning</span></code> when <code class="docutils literal notranslate"><span class="pre">u</span></code>, <code class="docutils literal notranslate"><span class="pre">u#</span></code>, <code class="docutils literal notranslate"><span class="pre">Z</span></code>, and <code class="docutils literal notranslate"><span class="pre">Z#</span></code> formats are used.</li>
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</ul>
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</section>
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<section id="python-3-12">
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<h3><a class="toc-backref" href="#python-3-12" role="doc-backlink">Python 3.12</a></h3>
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<ul class="simple">
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<li>Following members are removed from the Unicode structures:<ul>
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<li><code class="docutils literal notranslate"><span class="pre">wstr</span></code></li>
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<li><code class="docutils literal notranslate"><span class="pre">wstr_length</span></code></li>
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|
|
<li><code class="docutils literal notranslate"><span class="pre">state.compact</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">state.ready</span></code></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li>The <code class="docutils literal notranslate"><span class="pre">PyUnicodeObject</span></code> structure is removed.</li>
|
|||
|
|
<li>Following macros and functions, and enum members are removed:<ul>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">Py_UNICODE_WSTR_LENGTH()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GET_SIZE()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GetSize()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_GET_DATA_SIZE()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AS_UNICODE()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AS_DATA()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AsUnicode()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">_PyUnicode_AsUnicode()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_AsUnicodeAndSize()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_FromUnicode()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_WCHAR_KIND</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_READY()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_IS_READY()</span></code></li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_IS_COMPACT()</span></code></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyUnicode_FromStringAndSize(NULL,</span> <span class="pre">size))</span></code> raises
|
|||
|
|
<code class="docutils literal notranslate"><span class="pre">RuntimeError</span></code> when <code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre">></span> <span class="pre">0</span></code>.</li>
|
|||
|
|
<li><code class="docutils literal notranslate"><span class="pre">PyArg_ParseTuple()</span></code> and <code class="docutils literal notranslate"><span class="pre">PyArg_ParseTupleAndKeywords()</span></code> raise
|
|||
|
|
<code class="docutils literal notranslate"><span class="pre">SystemError</span></code> when <code class="docutils literal notranslate"><span class="pre">u</span></code>, <code class="docutils literal notranslate"><span class="pre">u#</span></code>, <code class="docutils literal notranslate"><span class="pre">Z</span></code>, and <code class="docutils literal notranslate"><span class="pre">Z#</span></code> formats are used,
|
|||
|
|
as other unsupported format character.</li>
|
|||
|
|
</ul>
|
|||
|
|
</section>
|
|||
|
|
</section>
|
|||
|
|
<section id="discussion">
|
|||
|
|
<h2><a class="toc-backref" href="#discussion" role="doc-backlink">Discussion</a></h2>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><a class="reference external" href="https://mail.python.org/archives/list/python-dev@python.org/thread/BO2TQHSXWL2RJMINWQQRBF5LANDDJNHH/#BO2TQHSXWL2RJMINWQQRBF5LANDDJNHH">Draft PEP: Remove wstr from Unicode</a></li>
|
|||
|
|
<li><a class="reference external" href="https://mail.python.org/archives/list/python-dev@python.org/thread/7JVC3IKS2V73K36ISEJAAWMRFN2T4KKR/#7JVC3IKS2V73K36ISEJAAWMRFN2T4KKR">When can we remove wchar_t* cache from string?</a></li>
|
|||
|
|
<li><a class="reference external" href="https://github.com/python/peps/pull/1462">PEP 623: Remove wstr from Unicode object #1462</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</section>
|
|||
|
|
<section id="references">
|
|||
|
|
<h2><a class="toc-backref" href="#references" role="doc-backlink">References</a></h2>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><a class="reference external" href="https://bugs.python.org/issue38604">bpo-38604: Schedule Py_UNICODE API removal</a></li>
|
|||
|
|
<li><a class="reference external" href="https://bugs.python.org/issue36346">bpo-36346: Prepare for removing the legacy Unicode C API</a></li>
|
|||
|
|
<li><a class="reference external" href="https://bugs.python.org/issue30863">bpo-30863: Rewrite PyUnicode_AsWideChar() and
|
|||
|
|
PyUnicode_AsWideCharString()</a>:
|
|||
|
|
They no longer cache the <code class="docutils literal notranslate"><span class="pre">wchar_t*</span></code> representation of string
|
|||
|
|
objects.</li>
|
|||
|
|
</ul>
|
|||
|
|
</section>
|
|||
|
|
<section id="copyright">
|
|||
|
|
<h2><a class="toc-backref" href="#copyright" role="doc-backlink">Copyright</a></h2>
|
|||
|
|
<p>This document has been placed in the public domain.</p>
|
|||
|
|
</section>
|
|||
|
|
</section>
|
|||
|
|
<hr class="docutils" />
|
|||
|
|
<p>Source: <a class="reference external" href="https://github.com/python/peps/blob/main/peps/pep-0623.rst">https://github.com/python/peps/blob/main/peps/pep-0623.rst</a></p>
|
|||
|
|
<p>Last modified: <a class="reference external" href="https://github.com/python/peps/commits/main/peps/pep-0623.rst">2023-09-09 17:39:29 GMT</a></p>
|
|||
|
|
|
|||
|
|
</article>
|
|||
|
|
<nav id="pep-sidebar">
|
|||
|
|
<h2>Contents</h2>
|
|||
|
|
<ul>
|
|||
|
|
<li><a class="reference internal" href="#abstract">Abstract</a></li>
|
|||
|
|
<li><a class="reference internal" href="#motivation">Motivation</a><ul>
|
|||
|
|
<li><a class="reference internal" href="#memory-usage">Memory usage</a></li>
|
|||
|
|
<li><a class="reference internal" href="#runtime-overhead">Runtime overhead</a></li>
|
|||
|
|
<li><a class="reference internal" href="#simplicity">Simplicity</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li><a class="reference internal" href="#rationale">Rationale</a><ul>
|
|||
|
|
<li><a class="reference internal" href="#python-4-0-is-not-scheduled-yet">Python 4.0 is not scheduled yet</a></li>
|
|||
|
|
<li><a class="reference internal" href="#python-2-reached-eol">Python 2 reached EOL</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li><a class="reference internal" href="#plan">Plan</a><ul>
|
|||
|
|
<li><a class="reference internal" href="#python-3-9">Python 3.9</a></li>
|
|||
|
|
<li><a class="reference internal" href="#python-3-10">Python 3.10</a></li>
|
|||
|
|
<li><a class="reference internal" href="#python-3-12">Python 3.12</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li><a class="reference internal" href="#discussion">Discussion</a></li>
|
|||
|
|
<li><a class="reference internal" href="#references">References</a></li>
|
|||
|
|
<li><a class="reference internal" href="#copyright">Copyright</a></li>
|
|||
|
|
</ul>
|
|||
|
|
|
|||
|
|
<br>
|
|||
|
|
<a id="source" href="https://github.com/python/peps/blob/main/peps/pep-0623.rst">Page Source (GitHub)</a>
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|||
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