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<section id="history">
<span id="changes"></span><h1>History<a class="headerlink" href="#history" title="Link to this heading">¶</a></h1>
<section id="v4-0-1">
<h2>v4.0.1<a class="headerlink" href="#v4-0-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>14 Dec 2024</dt><dd><ul class="simple">
<li><p>The unpickler is now more resilient to malformed “py/reduce”, “py/set”,
“py/tuple”, “py/b64”, “py/b85”, and “py/iterator” input data. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/544">+544</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/545">+545</a>)</p></li>
<li><p>The test suite was updated to leverage more pytest features.</p></li>
<li><p>The <code class="docutils literal notranslate"><span class="pre">jsonpickle.compat</span></code> module is no longer used. It is still provided
for backwards compatibility but it may be removed in a future version.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v4-0-0">
<h2>v4.0.0<a class="headerlink" href="#v4-0-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>11 Nov 2024</dt><dd><ul class="simple">
<li><p><strong>Breaking Change</strong>: Python 3.7 is no longer supported.</p></li>
<li><p><strong>Breaking Change</strong>: Support for pre-0.7.0 <code class="docutils literal notranslate"><span class="pre">repr</span></code>-serialized objects is no
longer enabled by default. The <code class="docutils literal notranslate"><span class="pre">safe</span></code> option to <code class="docutils literal notranslate"><span class="pre">decode()</span></code> was changed from
<code class="docutils literal notranslate"><span class="pre">False</span></code> to <code class="docutils literal notranslate"><span class="pre">True</span></code>. Users can still pass <code class="docutils literal notranslate"><span class="pre">safe=False</span></code> to <code class="docutils literal notranslate"><span class="pre">decode()</span></code> in order
to enable this feature for the purposes of loading older files, but beware that
this feature relies on unsafe behavior through its use of <code class="docutils literal notranslate"><span class="pre">eval()</span></code>. Users are
encouraged to re-pickle old data in order to migrate away from the the unsafe loading
feature. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/514">+514</a>)</p></li>
<li><p>The pickler no longer produces <code class="docutils literal notranslate"><span class="pre">py/repr</span></code> tags when pickling modules.
<code class="docutils literal notranslate"><span class="pre">py/mod</span></code> is used instead, as it is clearer and uses one less byte. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/514">+514</a>)</p></li>
<li><p>The test suite no longer uses the deprecated <code class="docutils literal notranslate"><span class="pre">datetime.datetime.utcnow()</span></code>
function. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/539">+539</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-4-2">
<h2>v3.4.2<a class="headerlink" href="#v3-4-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>05 Nov 2024</dt><dd><ul class="simple">
<li><p>The breaking changes from v4 were inadvertedly included in v3.4.1, which has
been yanked. This release remedies this by reverting the v4 changes.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-4-1">
<h2>v3.4.1<a class="headerlink" href="#v3-4-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>05 Nov 2024</dt><dd><ul class="simple">
<li><p>Support decoding pandas dataframes encoded with versions 3.3.0 and older. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/536">+536</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-4-0">
<h2>v3.4.0<a class="headerlink" href="#v3-4-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>05 Nov 2024</dt><dd><ul class="simple">
<li><p>Officially support Python 3.12 in the GitHub Actions testing matrix, and update
GHA package versions used. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/524">+524</a>)</p></li>
<li><p>Improve reproducibility of benchmarking commands on Linux by using taskset and
adding a “HOWTO” run benchmarks section in <code class="docutils literal notranslate"><span class="pre">benchmarking/README.md</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/526">+526</a>)</p></li>
<li><p>The <code class="docutils literal notranslate"><span class="pre">setup.cfg</span></code> packaging configuration has been replaced by
<code class="docutils literal notranslate"><span class="pre">pyproject.toml</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/527">+527</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">yaml</span></code> is now supported as a jsonpickle backend. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/528">+528</a>)</p></li>
<li><p><a class="reference external" href="https://github.com/google/oss-fuzz">OSSFuzz</a> scripts are now available in
the <code class="docutils literal notranslate"><span class="pre">fuzzing/</span></code> directory. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/525">+525</a>)</p></li>
<li><p>Pure-python dtypes are now preserved across <code class="docutils literal notranslate"><span class="pre">encode()</span></code>/<code class="docutils literal notranslate"><span class="pre">decode()</span></code> roundtrips
for the pandas extension. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/407">#407</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/534">+534</a>)</p></li>
<li><p>Pandas dataframe columns with an <code class="docutils literal notranslate"><span class="pre">object</span></code> dtype that contain multiple different
types within (e.g. a column of type <code class="docutils literal notranslate"><span class="pre">list[Union[str,</span> <span class="pre">int]]</span></code>) now preserve the types
upon being roundtripped. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/457">#457</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/358">#358</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/534">+534</a>)</p></li>
<li><p>Fix warnings in the test suite regarding numpy.compat usage. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/533">#533</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/535">+535</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-3-0">
<h2>v3.3.0<a class="headerlink" href="#v3-3-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>02 Sep 2024</dt><dd><ul class="simple">
<li><p>The unpickler was updated to avoid using <code class="docutils literal notranslate"><span class="pre">eval</span></code>, which helps improve its
security. Users can still pass <code class="docutils literal notranslate"><span class="pre">safe=False</span></code> to <code class="docutils literal notranslate"><span class="pre">decode</span></code> to use the old
behavior, though this is not recommended. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/513">+513</a>)</p></li>
<li><p>Objects can now exclude specific attributes from pickling by providing a
<code class="docutils literal notranslate"><span class="pre">_jsonpickle_exclude</span></code> class or instance attribute. This attribute should contain
the list of attribute names to exclude when pickling the object.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-2-2">
<h2>v3.2.2<a class="headerlink" href="#v3-2-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>19 Jun 2024</dt><dd><ul class="simple">
<li><p>A bug with the incorrect (de)serialization of NoneType objects has been fixed.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/507">+507</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">tests/benchmark.py</span></code> was updated to avoid Python 2 syntax. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/508">+508</a>)</p></li>
<li><p>The unpickler was updated to avoid creating temporary functions. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/508">+508</a>)</p></li>
<li><p>Some basic scripts have been made to analyze benchmark results. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/511">+511</a>)</p></li>
<li><p>Fix test suite compatibility with Numpy 2.x (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/512">+512</a>)</p></li>
<li><p><cite>setup.cfg</cite> was updated to use <cite>license_files</cite> instead of <cite>license_file</cite>.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-2-1">
<h2>v3.2.1<a class="headerlink" href="#v3-2-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>09 Jun 2024</dt><dd><ul class="simple">
<li><p>The <code class="docutils literal notranslate"><span class="pre">ignorereserved</span></code> parameter to the private <code class="docutils literal notranslate"><span class="pre">_restore_from_dict()</span></code>
function has been restored for backwards compatibility. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/501">+501</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-2-0">
<h2>v3.2.0<a class="headerlink" href="#v3-2-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>08 Jun 2024</dt><dd><ul class="simple">
<li><p>Nested dictionaries in <cite>py/state</cite> are now correctly restored when
tracking object references. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/501">+501</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/500">#500</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-1-0">
<h2>v3.1.0<a class="headerlink" href="#v3-1-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>08 Jun 2024</dt><dd><ul class="simple">
<li><p><cite>jsonpickle.ext.numpy.register_handlers</cite> now provides options that are forwarded
to the <cite>NumpyNDArrayHandler</cite> constructor. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/489">+489</a>)</p></li>
<li><p>Fix bug of not handling <code class="docutils literal notranslate"><span class="pre">classes</span></code> argument to <cite>jsonpickle.decode</cite>
being a dict. Previously, the keys were ignored and only values were
used. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/494">+494</a>)</p></li>
<li><p>Allow the <code class="docutils literal notranslate"><span class="pre">classes</span></code> argument to <cite>jsonpickle.pickle</cite> to have class
objects as keys. This extends the current functionality of only having
class name strings as keys. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/494">+494</a>)</p></li>
<li><p>The <code class="docutils literal notranslate"><span class="pre">garden</span> <span class="pre">setup/dev</span></code> action and <code class="docutils literal notranslate"><span class="pre">requirements-dev.txt</span></code> requirements file
now include test dependencies for use during development.</p></li>
<li><p>Added support for Python 3.13. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/505">+505</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/504">#504</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-0-4">
<h2>v3.0.4<a class="headerlink" href="#v3-0-4" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>11 Apr 2024</dt><dd><ul class="simple">
<li><p>Fixed an issue with django.SafeString and other classes inheriting from
str having read-only attribute errors (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/478">#478</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/481">+481</a>)</p></li>
<li><p>The test suite was made compatible with <cite>pytest-ruff>=0.3.0</cite>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/482">+482</a>)</p></li>
<li><p>A <cite>garden.yaml</cite> file was added for use with the
<cite>garden <https://crates.io/crates/garden-tools>_</cite> command runner. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/486">+486</a>)</p></li>
<li><p>The test suite was updated to avoid deprecated SQLALchemy APIs.</p></li>
<li><p>The <cite>jaraco.packaging.sphinx</cite> documentation dependency was removed.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-0-3">
<h2>v3.0.3<a class="headerlink" href="#v3-0-3" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>19 Feb 2024</dt><dd><ul class="simple">
<li><p>Compatibilty with Pandas and Cython 3.0 was added. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/460">#460</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/477">+477</a>)</p></li>
<li><p>Fixed a bug where pickling some built-in classes (e.g. zoneinfo)
could return a <code class="docutils literal notranslate"><span class="pre">None</span></code> module. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/447">#447</a>)</p></li>
<li><p>Fixed a bug where unpickling a missing class would return a different object
instead of <code class="docutils literal notranslate"><span class="pre">None</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/471">+471</a>)</p></li>
<li><p>Fixed the handling of missing classes when setting <code class="docutils literal notranslate"><span class="pre">on_missing</span></code> to <code class="docutils literal notranslate"><span class="pre">warn</span></code>
or <code class="docutils literal notranslate"><span class="pre">error</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/471">+471</a>)</p></li>
<li><p>The test suite was made compatible with Python 3.12.</p></li>
<li><p>The tox configuration was updated to generate code coverage reports.</p></li>
<li><p>The suite now uses <code class="docutils literal notranslate"><span class="pre">ruff</span></code> to validate python code.</p></li>
<li><p>The documentation can now be built offline when <code class="docutils literal notranslate"><span class="pre">rst.linker</span></code> and
<code class="docutils literal notranslate"><span class="pre">jaraco.packaging.sphinx</span></code> are not available.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-0-2">
<h2>v3.0.2<a class="headerlink" href="#v3-0-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>13 Aug 2023</dt><dd><ul class="simple">
<li><p>Properly raise warning if a custom pickling handler returns None. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/433">#433</a>)</p></li>
<li><p>Fix issue with serialization of certain sklearn objects breaking when
the numpy handler was enabled. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/431">#431</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/434">+434</a>)</p></li>
<li><p>Allow custom backends to not implement _encoder_options (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/436">#436</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/446">+446</a>)</p></li>
<li><p>Implement compatibility with pandas 2 (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/446">+446</a>)</p></li>
<li><p>Fix encoding/decoding of dictionary subclasses with referencing (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/455">+455</a>)</p></li>
<li><p>Fix depth tracking for list/dict referencing (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/456">+456</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-0-1">
<h2>v3.0.1<a class="headerlink" href="#v3-0-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>16 Dec 2022</dt><dd><ul class="simple">
<li><p>Remove accidental pin of setuptools to versions below 59. This allows
jsonpickle to build with CPython 3.11 and 3.12 alphas. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/424">#424</a>)</p></li>
<li><p>Remove accidental dependency on pytz in pandas tests. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/421">+421</a>)</p></li>
<li><p>Fix issue with decoding bson.bson.Int64 objects (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/422">#422</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v3-0-0">
<h2>v3.0.0<a class="headerlink" href="#v3-0-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>01 Dec 2022</dt><dd><ul class="simple">
<li><p>Drop support for CPython<3.7. CPython 3.6 and below have reached EOL
and no longer receive security updates. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/375">#375</a>)</p></li>
<li><p>Add support for CPython 3.11. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/395">#395</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/396">+396</a>)</p></li>
<li><p>Remove jsonlib and yajl backends (py2 only)</p></li>
<li><p>Add <code class="docutils literal notranslate"><span class="pre">include_properties</span></code> option to the pickler. This should only
be used if analyzing generated json outside of Python. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/297">#297</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/387">+387</a>)</p></li>
<li><p>Allow the <code class="docutils literal notranslate"><span class="pre">classes</span></code> argument to <code class="docutils literal notranslate"><span class="pre">jsonpickle.decode</span></code> to be a dict
of class name to class object. This lets you decode arbitrary dumps
into different classes. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/148">#148</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/392">+392</a>)</p></li>
<li><p>Fix bug with deserializing <cite>numpy.poly1d</cite>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/391">#391</a>)</p></li>
<li><p>Allow frozen dataclasses to be deserialized. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/240">#240</a>)</p></li>
<li><p>Fixed a bug where pickling a function could return a <code class="docutils literal notranslate"><span class="pre">None</span></code> module. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/399">#399</a>)</p></li>
<li><p>Removed old bytes/quopri and ref decoding abaility from the unpickler.
These were last used in jsonpickle<1. Removing them causes a slight speedup
in unpickling lists (~5%). (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/403">+403</a>)</p></li>
<li><p>Fixed a bug with namedtuples encoding on CPython 3.11. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/411">#411</a>)</p></li>
<li><p>When using the <code class="docutils literal notranslate"><span class="pre">sort_keys</span></code> option for the <code class="docutils literal notranslate"><span class="pre">simplejson</span></code> backend,
jsonpickle now produces correct object references with py/id tags. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/408">#408</a>)</p></li>
<li><p>Speed up the internal method <code class="docutils literal notranslate"><span class="pre">_restore_tags</span></code> by ~10%. This should speed
up unpickling of almost every object.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v2-2-0">
<h2>v2.2.0<a class="headerlink" href="#v2-2-0" title="Link to this heading">¶</a></h2>
<p>10 May 2022</p>
<blockquote>
<div><ul class="simple">
<li><p>Classes with a custom <code class="docutils literal notranslate"><span class="pre">__getitem__()</span></code> and <code class="docutils literal notranslate"><span class="pre">append()</span></code>
now pickle properly. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/362">#362</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/379">+379</a>)</p></li>
<li><p>Remove the demjson backend, as demjson hasn’t been maintained
for 5 years. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/379">+379</a>)</p></li>
<li><p>Added new handler for numpy objects when using unpickleable=False.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/381">#381</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/382">+382</a>)</p></li>
<li><p>Added exception handling for class attributes that can’t be accessed.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/301">#301</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/383">+383</a>)</p></li>
<li><p>Added a long-requested on_missing attribute to the Unpickler class.
This lets you choose behavior for when jsonpickle can’t find a class
to deserialize to. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/190">#190</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/193">#193</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/384">+384</a>)</p></li>
<li><p>Private members of <code class="docutils literal notranslate"><span class="pre">__slots__</span></code> are no longer skipped when encoding.
Any objects encoded with versions prior to 2.2.0 should still decode
properly. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/318">#318</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/385">+385</a>)</p></li>
</ul>
</div></blockquote>
</section>
<section id="v2-1-0">
<h2>v2.1.0<a class="headerlink" href="#v2-1-0" title="Link to this heading">¶</a></h2>
<p>10 Jan 2022</p>
<blockquote>
<div><ul class="simple">
<li><p>Python 3.10 is now officially supported. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/376">+376</a>)</p></li>
<li><p>Benchmarks were added to aid in optimization efforts. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/350">#350</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/352">+352</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">is_reducible()</span></code> was sped up by ~80%. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/353">+353</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/354">+354</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">_restore_tags()</span></code> was sped up by ~100%. Unpickling items
with a lot of tuples and sets will benefit most. Python 2 users
and users deserializing pickles from jsonpickle <= 0.9.6 may see
a slight performance decrease if using a lot of bytes, ref,
and/or repr objects. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/354">+354</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">is_iterator()</span></code> was sped up by ~20% by removing an unnecessary
variable assignment. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/354">+354</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">jsonpickle.decode</span></code> has a new option, <code class="docutils literal notranslate"><span class="pre">v1_decode</span></code> to assist in
decoding objects created in jsonpickle version 1. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/364">#364</a>)</p></li>
<li><p>The <code class="docutils literal notranslate"><span class="pre">encode()</span></code> documentation has been updated to help sklearn users.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">demjson</span></code> has been removed from the test suite. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/374">+374</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">SQLALchemy<1.2</span></code> is no longer being tested by jsonpickle.
Users of sqlalchemy + jsonpickle can always use 1.2 or 1.3.
When jsonpickle v3 is released we will add SQLAlchemy 1.4 to
the test suite alongside removal of support for Python 3.5 and earlier.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v2-0-0">
<h2>v2.0.0<a class="headerlink" href="#v2-0-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>07 Feb 2021</dt><dd><ul class="simple">
<li><p>Major release: the serialized JSON format now preserves dictionary
identity, which is a subtle change in the serialized format. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/351">#351</a>)</p></li>
<li><p>Dictionary identity is now preserved. For example, if the same
dictionary appears twice in a list, the reconstituted list
will now contain two references to the same dictionary. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/255">#255</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/332">+332</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-5-2">
<h2>v1.5.2<a class="headerlink" href="#v1-5-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>07 Feb 2021</dt><dd><ul class="simple">
<li><p>Patch release to avoid the change in behavior from the preservation
of dict identity. The next release will be v2.0.0. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/351">#351</a>)</p></li>
<li><p>This release does <em>not</em> include the performance improvements
from v1.5.1.</p></li>
<li><p>Pandas DataFrame objects with multilevel columns are now supported.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/346">#346</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/347">+347</a>)</p></li>
<li><p>Numpy 1.20 is now officially supported. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/336">#336</a>)</p></li>
<li><p>Python 3.9 is now officially supported. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/348">+348</a>)</p></li>
<li><p>Achieved a small speedup for _get_flattener by merging type checks. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/349">+349</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-5-1">
<h2>v1.5.1<a class="headerlink" href="#v1-5-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>30 Jan 2021</dt><dd><ul class="simple">
<li><p>The performance of the unpickler was drastically improved by
avoiding tag checks for basic Python types. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/340">+340</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">decode()</span></code> documentation improvements. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/341">+341</a>)</p></li>
<li><p>Serialization of Pandas DataFrame objects that contain
timedelta64[ns] dtypes are now supported. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/330">+330</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/331">#331</a>)</p></li>
<li><p>Dictionary identity is now preserved. For example, if the same
dictionary appears twice in a list, the reconstituted list
will now contain two references to the same dictionary. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/255">#255</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/332">+332</a>)</p></li>
<li><p>Unit tests were added to ensure that sklearn.tree.DecisionTreeClassifier
objects are properly serialized. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/155">#155</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/344">+344</a>)</p></li>
<li><p>The <code class="docutils literal notranslate"><span class="pre">is_reducible()</span></code> utility function used by <code class="docutils literal notranslate"><span class="pre">encode()</span></code> is now
4x faster! Objects that provide <code class="docutils literal notranslate"><span class="pre">__getstate__()</span></code>, <code class="docutils literal notranslate"><span class="pre">__setstate__()</span></code>,
and <code class="docutils literal notranslate"><span class="pre">__slots__</span></code> benefit most from these improvements. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/343">+343</a>)</p></li>
<li><p>Improved pickler <code class="docutils literal notranslate"><span class="pre">flatten()/encode()</span></code> performance. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/345">+345</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-5-0">
<h2>v1.5.0<a class="headerlink" href="#v1-5-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>16 Jan 2021</dt><dd><ul class="simple">
<li><p>Previous versions of jsonpickle with <cite>make_refs=False</cite> would emit
<code class="docutils literal notranslate"><span class="pre">null</span></code> when encountering an object it had already seen when
traversing objects. All instances of the object are now serialized.
While this is arguably an improvement in the vast majority of
scenarios, it is a change in behavior and is thus considered a
minor-level change. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/333">#333</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/334">#334</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/337">#337</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/338">+338</a>)</p></li>
<li><p>Multiple enums are now serialized correctly with <cite>make_refs=False</cite>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/235">#235</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-4-2">
<h2>v1.4.2<a class="headerlink" href="#v1-4-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>29 Nov 2020</dt><dd><ul class="simple">
<li><p>Use importlib.metadata from the stdlib on Python 3.8. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/305">+305</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/303">#303</a>)</p></li>
<li><p>Micro-optimize type checks to use a <cite>set</cite> for lookups. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/327">+327</a>)</p></li>
<li><p>Documentation improvements.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-4-1">
<h2>v1.4.1<a class="headerlink" href="#v1-4-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>20 Apr 2020</dt><dd><ul class="simple">
<li><p>Patch release for Python 3.8 <cite>importlib_metadata</cite> support.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/300">#300</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-4">
<h2>v1.4<a class="headerlink" href="#v1-4" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>13 Apr 2020</dt><dd><ul class="simple">
<li><p>Python 3.8 support. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/292">#292</a>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">jsonpickle.encode</span></code> now supports the standard <code class="docutils literal notranslate"><span class="pre">indent</span></code>
and <code class="docutils literal notranslate"><span class="pre">separators</span></code> arguments, and passes them through to the
active JSON backend library. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/183">#183</a>)</p></li>
<li><p>We now include a custom handler for <cite>array.array</cite> objects. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/199">#199</a>)</p></li>
<li><p>Dict key order is preserved when pickling dictionaries on Python3. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/193">#193</a>)</p></li>
<li><p>Improved serialization of dictionaries with non-string keys.
Previously, using an enum that was both the key and a value in
a dictionary could end up with incorrect references to other
objects. The references are now properly maintained for dicts
with object keys that are also referenced in the dict’s values. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/286">#286</a>)</p></li>
<li><p>Improved serialization of pandas.Series objects. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/287">#287</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-3">
<h2>v1.3<a class="headerlink" href="#v1-3" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>13 Feb 2020</dt><dd><ul class="simple">
<li><p>Improved round tripping of default dicts. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/283">+283</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/282">#282</a>)</p></li>
<li><p>Better support for cyclical references when encoding with
<code class="docutils literal notranslate"><span class="pre">unpicklable=False</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/264">+264</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-2">
<h2>v1.2<a class="headerlink" href="#v1-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>15 May 2019</dt><dd><ul class="simple">
<li><p>Simplified JSON representation for <cite>__reduce__</cite> values. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/261">+261</a>)</p></li>
<li><p>Improved Pandas support with new handlers for more Pandas data types.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/256">+256</a>)</p></li>
<li><p>Prevent stack overflows caused by bugs in user-defined <cite>__getstate__</cite>
functions which cause infinite recursion. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/260">+260</a>)
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/259">#259</a>)</p></li>
<li><p>Improved support for objects that contain dicts with Integer keys.
Previously, jsonpickle could not restore objects that contained
dicts with integer keys and provided getstate only.
These objects are now handled robustly. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/247">#247</a>).</p></li>
<li><p>Support for encoding binary data in <a class="reference external" href="https://en.wikipedia.org/wiki/Ascii85">base85</a> instead of base64 has been
added on Python 3. Base85 produces payloads about 10% smaller than base64,
albeit at the cost of lower throughput. For performance and backwards
compatibility with Python 2 the pickler uses base64 by default, but it can
be configured to use <code class="docutils literal notranslate"><span class="pre">base85</span></code> with the new <code class="docutils literal notranslate"><span class="pre">use_base85</span></code> argument.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/251">#251</a>).</p></li>
<li><p>Dynamic SQLAlchemy tables in SQLAlchemy >= 1.3 are now supported.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/254">#254</a>).</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-1">
<h2>v1.1<a class="headerlink" href="#v1-1" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>22 Jan 2019</dt><dd><ul class="simple">
<li><p>Python 3.7 <cite>collections.Iterator</cite> deprecation warnings have been fixed.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/229">#229</a>).</p></li>
<li><p>Improved Pandas support for datetime and complex numbers. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/245">+245</a>)</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v1-0">
<h2>v1.0<a class="headerlink" href="#v1-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>01 Sep 2018</dt><dd><ul class="simple">
<li><p><em>NOTE</em> jsonpickle no longer supports Python2.6, or Python3 < 3.4.
The officially supported Python versions are now 2.7 and 3.4+.</p></li>
<li><p>Improved Pandas and Numpy support. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/227">+227</a>)</p></li>
<li><p>Improved support for pickling iterators. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/216">+216</a>)</p></li>
<li><p>Better support for the stdlib <cite>json</cite> module when <cite>simplejson</cite>
is not installed. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/217">+217</a>)</p></li>
<li><p>jsonpickle will now output python3-style module names when
pickling builtins methods or functions. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/223">+223</a>)</p></li>
<li><p>jsonpickle will always flatten primitives, even when <code class="docutils literal notranslate"><span class="pre">max_depth</span></code>
is reached, which avoids encoding unicode strings into their
<code class="docutils literal notranslate"><span class="pre">u'string'</span></code> representation. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/207">+207</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/180">#180</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/198">#198</a>).</p></li>
<li><p>Nested classes are now supported on Python 3. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/206">+206</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/176">#176</a>).</p></li>
<li><p>Better support for older (pre-1.9) versions of numpy (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/195">+195</a>).</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-6">
<h2>v0.9.6<a class="headerlink" href="#v0-9-6" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>09 Feb 2018</dt><dd><ul class="simple">
<li><p>Better support for SQLAlchemy (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/180">#180</a>).</p></li>
<li><p>Better support for NumPy and SciKit-Learn. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/184">#184</a>).</p></li>
<li><p>Better support for dict sub-classes (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/156">#156</a>).</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-5">
<h2>v0.9.5<a class="headerlink" href="#v0-9-5" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>16 Jul 2017</dt><dd><ul class="simple">
<li><p>Better support for objects that implement the reduce protocol. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/170">+170</a>)
This backward-incompatible change removes the SimpleReduceHandler.
Any projects registering that handler for a particular type should
instead remove references to the handler and jsonpickle will now
handle those types directly.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-4">
<h2>v0.9.4<a class="headerlink" href="#v0-9-4" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>10 Jan 2017</dt><dd><ul class="simple">
<li><p>Arbitrary byte streams are now better supported. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/143">#143</a>)</p></li>
<li><p>Better support for NumPy data types. The Python3 NumPy support
is especially robust.</p></li>
<li><p>Fortran-ordered based NumPy arrays are now properly serialized.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-3">
<h2>v0.9.3<a class="headerlink" href="#v0-9-3" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>09 Mar 2016</dt><dd><ul class="simple">
<li><p>UUID objects can now be serialized (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/130">#130</a>)</p></li>
<li><p>Added <cite>set_decoder_options</cite> method to allow decoder specific options
equal to <cite>set_encoder_options</cite>.</p></li>
<li><p>Int keys can be encoded directly by e.g. demjson by passing
<cite>numeric_keys=True</cite> and setting its backend options via
<cite>jsonpickle.set_encoder_options(‘demjson’, strict=False)</cite>.</p></li>
<li><p>Newer Numpy versions (v1.10+) are now supported.</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-2">
<h2>v0.9.2<a class="headerlink" href="#v0-9-2" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>20 Mar 2015</dt><dd><ul class="simple">
<li><p>Fixes for serializing objects with custom handlers.</p></li>
<li><p>We now properly serialize deque objects constructed with a <cite>maxlen</cite> parameter.</p></li>
<li><p>Test suite fixes</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-9-1">
<h2>v0.9.1<a class="headerlink" href="#v0-9-1" title="Link to this heading">¶</a></h2>
<p>12 Mar 2015</p>
<blockquote>
<div><ul class="simple">
<li><p>Support datetime objects with FixedOffsets.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-9-0">
<h2>v0.9.0<a class="headerlink" href="#v0-9-0" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>16 Jan 2015</dt><dd><ul class="simple">
<li><p>Support for Pickle Protocol v4.</p></li>
<li><p>We now support serializing defaultdict subclasses that use <cite>self</cite>
as their default factory.</p></li>
<li><p>We now have a decorator syntax for registering custom handlers,
and allow custom handlers to register themselves for all subclasses.
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/pull/104">+104</a>)</p></li>
<li><p>We now support serializing types with metaclasses and their
instances (e.g., Python 3 <cite>enum</cite>).</p></li>
<li><p>We now support serializing bytestrings in both Python 2 and Python 3.
In Python 2, the <cite>str</cite> type is decoded to UTF-8 whenever possible and
serialized as a true bytestring elsewise; in Python 3, bytestrings
are explicitly encoded/decoded as bytestrings. Unicode strings are
always encoded as is in both Python 2 and Python 3.</p></li>
<li><p>Added support for serializing numpy arrays, dtypes and scalars
(see <cite>jsonpickle.ext.numpy</cite> module).</p></li>
</ul>
</dd>
</dl>
</section>
<section id="v0-8-0">
<h2>v0.8.0<a class="headerlink" href="#v0-8-0" title="Link to this heading">¶</a></h2>
<p>06 Sep 2014</p>
<blockquote>
<div><ul class="simple">
<li><p>We now support serializing objects that contain references to
module-level functions. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/77">#77</a>)</p></li>
<li><p>Better Pickle Protocol v2 support. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/78">#78</a>)</p></li>
<li><p>Support for string <code class="docutils literal notranslate"><span class="pre">__slots__</span></code> and iterable <code class="docutils literal notranslate"><span class="pre">__slots__</span></code>. (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/67">#67</a>) (<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/68">#68</a>)</p></li>
<li><p><cite>encode()</cite> now has a <cite>warn</cite> option that makes jsonpickle emit warnings
when encountering objects that cannot be pickled.</p></li>
<li><p>A Javascript implementation of jsonpickle is now included
in the jsonpickleJS directory.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-7-2">
<h2>v0.7.2<a class="headerlink" href="#v0-7-2" title="Link to this heading">¶</a></h2>
<p>06 Aug 2014</p>
<blockquote>
<div><ul class="simple">
<li><p>We now properly serialize classes that inherit from classes
that use <cite>__slots__</cite> and add additional slots in the derived class.</p></li>
<li><p>jsonpickle can now serialize objects that implement <cite>__getstate__()</cite> but
not <cite>__setstate__()</cite>. The result of <cite>__getstate__()</cite> is returned as-is
when doing a round-trip from Python objects to jsonpickle and back.</p></li>
<li><p>Better support for collections.defaultdict with custom factories.</p></li>
<li><p>Added support for <cite>queue.Queue</cite> objects.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-7-1">
<h2>v0.7.1<a class="headerlink" href="#v0-7-1" title="Link to this heading">¶</a></h2>
<p>06 May 2014</p>
<blockquote>
<div><ul class="simple">
<li><p>Added support for Python 3.4.</p></li>
<li><p>Added support for <cite>posix.stat_result</cite>.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-7-0">
<h2>v0.7.0<a class="headerlink" href="#v0-7-0" title="Link to this heading">¶</a></h2>
<p>15 Mar 2014</p>
<blockquote>
<div><ul class="simple">
<li><p>Added <code class="docutils literal notranslate"><span class="pre">handles</span></code> decorator to <a class="reference internal" href="api.html#jsonpickle.handlers.BaseHandler" title="jsonpickle.handlers.BaseHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">jsonpickle.handlers.BaseHandler</span></code></a>,
enabling simple declaration of a handler for a class.</p></li>
<li><p><cite>__getstate__()</cite> and <cite>__setstate__()</cite> are now honored
when pickling objects that subclass <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.13)"><code class="xref py py-class docutils literal notranslate"><span class="pre">dict</span></code></a>.</p></li>
<li><p>jsonpickle can now serialize <a class="reference external" href="https://docs.python.org/3/library/collections.html#collections.Counter" title="(in Python v3.13)"><code class="xref py py-class docutils literal notranslate"><span class="pre">collections.Counter</span></code></a> objects.</p></li>
<li><p>Object references are properly handled when using integer keys.</p></li>
<li><p>Object references are now supported when using custom handlers.</p></li>
<li><p>Decimal objects are supported in Python 3.</p></li>
<li><p>jsonpickle’s “fallthrough-on-error” behavior can now be disabled.</p></li>
<li><p>Simpler API for registering custom handlers.</p></li>
<li><p>A new “safe-mode” is provided which avoids eval().
Backwards-compatible deserialization of repr-serialized objects
is disabled in this mode. e.g. <cite>decode(string, safe=True)</cite></p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-6-1">
<h2>v0.6.1<a class="headerlink" href="#v0-6-1" title="Link to this heading">¶</a></h2>
<p>25 Aug 2013</p>
<blockquote>
<div><ul class="simple">
<li><p>Python 3.2 support, and additional fixes for Python 3.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-6-0">
<h2>v0.6.0<a class="headerlink" href="#v0-6-0" title="Link to this heading">¶</a></h2>
<p>24 Aug 2013</p>
<blockquote>
<div><ul class="simple">
<li><p>Python 3 support!</p></li>
<li><p><a class="reference external" href="https://docs.python.org/3/library/time.html#time.struct_time" title="(in Python v3.13)"><code class="xref py py-class docutils literal notranslate"><span class="pre">time.struct_time</span></code></a> is now serialized using the built-in
<cite>jsonpickle.handlers.SimpleReduceHandler</cite>.</p></li>
</ul>
</div></blockquote>
</section>
<section id="v0-5-0">
<h2>v0.5.0<a class="headerlink" href="#v0-5-0" title="Link to this heading">¶</a></h2>
<p>22 Aug 2013</p>
<blockquote>
<div><ul class="simple">
<li><p>Non-string dictionary keys (e.g. ints, objects) are now supported
by passing <cite>keys=True</cite> to <a class="reference internal" href="api.html#jsonpickle.encode" title="jsonpickle.encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">jsonpickle.encode()</span></code></a> and
<a class="reference internal" href="api.html#jsonpickle.decode" title="jsonpickle.decode"><code class="xref py py-func docutils literal notranslate"><span class="pre">jsonpickle.decode()</span></code></a>.</p></li>
<li><p>We now support namedtuple, deque, and defaultdict.</p></li>
<li><p>Datetimes with timezones are now fully supported.</p></li>
<li><p>Better support for complicated structures e.g.
datetime inside dicts.</p></li>
<li><p>jsonpickle added support for references and cyclical data structures
in 0.4.0. This can be disabled by passing <cite>make_refs=False</cite> to
<a class="reference internal" href="api.html#jsonpickle.encode" title="jsonpickle.encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">jsonpickle.encode()</span></code></a>.</p></li>
</ul>
</div></blockquote>
</section>
<section id="id154">
<h2>0.4.0<a class="headerlink" href="#id154" title="Link to this heading">¶</a></h2>
<p>21 Jun 2011</p>
<blockquote>
<div><ul class="simple">
<li><p>Switch build from setuptools to distutils</p></li>
<li><p>Consistent dictionary key ordering</p></li>
<li><p>Fix areas with improper support for unpicklable=False</p></li>
<li><p>Added support for cyclical data structures
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/16">#16</a>).</p></li>
<li><p>Experimental support for <a class="reference external" href="http://pypi.python.org/pypi/jsonlib/">jsonlib</a>
and <a class="reference external" href="http://github.com/rtyler/py-yajl/">py-yajl</a> backends.</p></li>
<li><p>New contributors David K. Hess and Alec Thomas</p></li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>To support cyclical data structures
(<a class="reference external" href="https://github.com/jsonpickle/jsonpickle/issues/16">#16</a>),
the storage format has been modified. Efforts have been made to
ensure backwards-compatibility. jsonpickle 0.4.0 can read data
encoded by jsonpickle 0.3.1, but earlier versions of jsonpickle may be
unable to read data encoded by jsonpickle 0.4.0.</p>
</div>
</div></blockquote>
</section>
<section id="id157">
<h2>0.3.1<a class="headerlink" href="#id157" title="Link to this heading">¶</a></h2>
<p>12 Dec 2009</p>
<blockquote>
<div><ul class="simple">
<li><p>Include tests and docs directories in sdist for distribution packages.</p></li>
</ul>
</div></blockquote>
</section>
<section id="id158">
<h2>0.3.0<a class="headerlink" href="#id158" title="Link to this heading">¶</a></h2>
<p>11 Dec 2009</p>
<blockquote>
<div><ul class="simple">
<li><p>Officially migrated to git from subversion. Project home now at
<a class="reference external" href="http://jsonpickle.github.com/">http://jsonpickle.github.com/</a>. Thanks to Michael Jone’s
<a class="reference external" href="http://github.com/michaeljones/sphinx-to-github">sphinx-to-github</a>.</p></li>
<li><p>Fortified jsonpickle against common error conditions.</p></li>
<li><p>Added support for:</p></li>
</ul>
<blockquote>
<div><ul class="simple">
<li><p>List and set subclasses.</p></li>
<li><p>Objects with module references.</p></li>
<li><p>Newstyle classes with <cite>__slots__</cite>.</p></li>
<li><p>Objects implementing <cite>__setstate__()</cite> and <cite>__getstate__()</cite>
(follows the <a class="reference external" href="https://docs.python.org/3/library/pickle.html#module-pickle" title="(in Python v3.13)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> protocol).</p></li>
</ul>
</div></blockquote>
<ul class="simple">
<li><p>Improved support for Zope objects via pre-fetch.</p></li>
<li><p>Support for user-defined serialization handlers via the
jsonpickle.handlers registry.</p></li>
<li><p>Removed cjson support per John Millikin’s recommendation.</p></li>
<li><p>General improvements to style, including <span class="target" id="index-0"></span><a class="pep reference external" href="https://peps.python.org/pep-0257/"><strong>PEP 257</strong></a> compliance and
refactored project layout.</p></li>
<li><p>Steps towards Python 2.3 and Python 3 support.</p></li>
<li><p>New contributors Dan Buch and Ian Schenck.</p></li>
<li><p>Thanks also to Kieran Darcy, Eoghan Murray, and Antonin Hildebrand
for their assistance!</p></li>
</ul>
</div></blockquote>
</section>
<section id="id159">
<h2>0.2.0<a class="headerlink" href="#id159" title="Link to this heading">¶</a></h2>
<p>10 Jan 2009</p>
<blockquote>
<div><ul class="simple">
<li><p>Support for all major Python JSON backends (including json in Python 2.6,
simplejson, cjson, and demjson)</p></li>
<li><p>Handle several datetime objects using the repr() of the objects
(Thanks to Antonin Hildebrand).</p></li>
<li><p>Sphinx documentation</p></li>
<li><p>Added support for recursive data structures</p></li>
<li><p>Unicode dict-keys support</p></li>
<li><p>Support for Google App Engine and Django</p></li>
<li><p>Tons of additional testing and bug reports (Antonin Hildebrand, Sorin,
Roberto Saccon, Faber Fedor,
<a class="reference external" href="http://github.com/darwin/firepython/tree/master">FirePython</a>, and
<a class="reference external" href="http://code.google.com/p/joose-js/">Joose</a>)</p></li>
</ul>
</div></blockquote>
</section>
<section id="id160">
<h2>0.1.0<a class="headerlink" href="#id160" title="Link to this heading">¶</a></h2>
<p>22 Aug 2008</p>
<blockquote>
<div><ul class="simple">
<li><p>Added long as basic primitive (thanks Adam Fisk)</p></li>
<li><p>Prefer python-cjson to simplejson, if available</p></li>