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<section id="api-changes-for-3-9-0">
<h1>API Changes for 3.9.0<a class="headerlink" href="#api-changes-for-3-9-0" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#behaviour-changes" id="id2">Behaviour Changes</a></p></li>
<li><p><a class="reference internal" href="#deprecations" id="id3">Deprecations</a></p></li>
<li><p><a class="reference internal" href="#removals" id="id4">Removals</a></p></li>
<li><p><a class="reference internal" href="#development-changes" id="id5">Development changes</a></p></li>
</ul>
</nav>
<section id="behaviour-changes">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Behaviour Changes</a><a class="headerlink" href="#behaviour-changes" title="Link to this heading">#</a></h2>
<section id="plot-shorthand-format-interprets-cn-n-9-as-a-color-cycle-color">
<h3>plot() shorthand format interprets "Cn" (n>9) as a color-cycle color<a class="headerlink" href="#plot-shorthand-format-interprets-cn-n-9-as-a-color-cycle-color" title="Link to this heading">#</a></h3>
<p>Previously, <code class="docutils literal notranslate"><span class="pre">plot(...,</span> <span class="pre">"-C11")</span></code> would be interpreted as requesting a plot using
linestyle "-", color "C1" (color #1 of the color cycle), and marker "1" ("tri-down").
It is now interpreted as requesting linestyle "-" and color "C11" (color #11 of the
color cycle).</p>
<p>It is recommended to pass ambiguous markers (such as "1") explicitly using the <em>marker</em>
keyword argument. If the shorthand form is desired, such markers can also be
unambiguously set by putting them <em>before</em> the color string.</p>
</section>
<section id="legend-labels-for-plot">
<h3>Legend labels for <code class="docutils literal notranslate"><span class="pre">plot</span></code><a class="headerlink" href="#legend-labels-for-plot" title="Link to this heading">#</a></h3>
<p>Previously if a sequence was passed to the <em>label</em> parameter of <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.plot.html#matplotlib.axes.Axes.plot" title="matplotlib.axes.Axes.plot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">plot</span></code></a> when
plotting a single dataset, the sequence was automatically cast to string for the legend
label. Now, if the sequence has only one element, that element will be the legend label.
To keep the old behavior, cast the sequence to string before passing.</p>
</section>
<section id="boxplots-now-ignore-masked-data-points">
<h3>Boxplots now ignore masked data points<a class="headerlink" href="#boxplots-now-ignore-masked-data-points" title="Link to this heading">#</a></h3>
<p><a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.boxplot.html#matplotlib.axes.Axes.boxplot" title="matplotlib.axes.Axes.boxplot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">boxplot</span></code></a> and <a class="reference internal" href="../cbook_api.html#matplotlib.cbook.boxplot_stats" title="matplotlib.cbook.boxplot_stats"><code class="xref py py-obj docutils literal notranslate"><span class="pre">boxplot_stats</span></code></a> now ignore any
masked points in the input data.</p>
</section>
<section id="axhspan-and-axvspan-now-return-rectangles-not-polygons">
<h3><code class="docutils literal notranslate"><span class="pre">axhspan</span></code> and <code class="docutils literal notranslate"><span class="pre">axvspan</span></code> now return <code class="docutils literal notranslate"><span class="pre">Rectangle</span></code>s, not <code class="docutils literal notranslate"><span class="pre">Polygon</span></code>s<a class="headerlink" href="#axhspan-and-axvspan-now-return-rectangles-not-polygons" title="Link to this heading">#</a></h3>
<p>This change allows using <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.axhspan.html#matplotlib.axes.Axes.axhspan" title="matplotlib.axes.Axes.axhspan"><code class="xref py py-obj docutils literal notranslate"><span class="pre">axhspan</span></code></a> to draw an annulus on polar axes.</p>
<p>This change also affects other elements built via <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.axhspan.html#matplotlib.axes.Axes.axhspan" title="matplotlib.axes.Axes.axhspan"><code class="xref py py-obj docutils literal notranslate"><span class="pre">axhspan</span></code></a> and <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.axvspan.html#matplotlib.axes.Axes.axvspan" title="matplotlib.axes.Axes.axvspan"><code class="xref py py-obj docutils literal notranslate"><span class="pre">axvspan</span></code></a>,
such as <code class="docutils literal notranslate"><span class="pre">Slider.poly</span></code>.</p>
</section>
<section id="improved-handling-of-pan-zoom-events-of-overlapping-axes">
<h3>Improved handling of pan/zoom events of overlapping Axes<a class="headerlink" href="#improved-handling-of-pan-zoom-events-of-overlapping-axes" title="Link to this heading">#</a></h3>
<p>The forwarding of pan/zoom events is now determined by the visibility of the
background-patch (e.g. <code class="docutils literal notranslate"><span class="pre">ax.patch.get_visible()</span></code>) and by the <code class="docutils literal notranslate"><span class="pre">zorder</span></code> of the axes.</p>
<ul class="simple">
<li><p>Axes with a visible patch capture the event and do not pass it on to axes below. Only
the Axes with the highest <code class="docutils literal notranslate"><span class="pre">zorder</span></code> that contains the event is triggered (if there
are multiple Axes with the same <code class="docutils literal notranslate"><span class="pre">zorder</span></code>, the last added Axes counts)</p></li>
<li><p>Axes with an invisible patch are also invisible to events and they are passed on to
the axes below.</p></li>
</ul>
<p>To override the default behavior and explicitly set whether an Axes should forward
navigation events, use <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.set_forward_navigation_events.html#matplotlib.axes.Axes.set_forward_navigation_events" title="matplotlib.axes.Axes.set_forward_navigation_events"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axes.set_forward_navigation_events</span></code></a>.</p>
</section>
<section id="loc-best-for-legend-now-considers-text-and-polycollections">
<h3><code class="docutils literal notranslate"><span class="pre">loc='best'</span></code> for <code class="docutils literal notranslate"><span class="pre">legend</span></code> now considers <code class="docutils literal notranslate"><span class="pre">Text</span></code> and <code class="docutils literal notranslate"><span class="pre">PolyCollections</span></code><a class="headerlink" href="#loc-best-for-legend-now-considers-text-and-polycollections" title="Link to this heading">#</a></h3>
<p>The location selection <code class="docutils literal notranslate"><span class="pre">legend</span></code> now considers the existence of <code class="docutils literal notranslate"><span class="pre">Text</span></code> and
<code class="docutils literal notranslate"><span class="pre">PolyCollections</span></code> in the <code class="docutils literal notranslate"><span class="pre">badness</span></code> calculation.</p>
<p>Note: The <code class="docutils literal notranslate"><span class="pre">best</span></code> option can already be quite slow for plots with large amounts of
data. For <code class="docutils literal notranslate"><span class="pre">PolyCollections</span></code>, it only considers the <code class="docutils literal notranslate"><span class="pre">Path</span></code> of <code class="docutils literal notranslate"><span class="pre">PolyCollections</span></code> and
not the enclosed area when checking for overlap to reduce additional latency. However,
it can still be quite slow when there are large amounts of <code class="docutils literal notranslate"><span class="pre">PolyCollections</span></code> in the
plot to check for.</p>
</section>
<section id="exception-when-not-passing-a-bbox-to-bboxtransform-classes">
<h3>Exception when not passing a Bbox to BboxTransform*-classes<a class="headerlink" href="#exception-when-not-passing-a-bbox-to-bboxtransform-classes" title="Link to this heading">#</a></h3>
<p>The exception when not passing a Bbox to BboxTransform*-classes that expect one, e.g.,
<a class="reference internal" href="../transformations.html#matplotlib.transforms.BboxTransform" title="matplotlib.transforms.BboxTransform"><code class="xref py py-obj docutils literal notranslate"><span class="pre">BboxTransform</span></code></a> has changed from <code class="docutils literal notranslate"><span class="pre">ValueError</span></code> to <code class="docutils literal notranslate"><span class="pre">TypeError</span></code>.</p>
</section>
<section id="loc-parameter-of-cell-no-longer-accepts-none">
<h3><em>loc</em> parameter of <code class="docutils literal notranslate"><span class="pre">Cell</span></code> no longer accepts <code class="docutils literal notranslate"><span class="pre">None</span></code><a class="headerlink" href="#loc-parameter-of-cell-no-longer-accepts-none" title="Link to this heading">#</a></h3>
<p>The default value of the <em>loc</em> parameter has been changed from <code class="docutils literal notranslate"><span class="pre">None</span></code> to <code class="docutils literal notranslate"><span class="pre">right</span></code>,
which already was the default location. The behavior of <a class="reference internal" href="../table_api.html#matplotlib.table.Cell" title="matplotlib.table.Cell"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Cell</span></code></a> didn't change when
called without an explicit <em>loc</em> parameter.</p>
</section>
<section id="contourlabeler-add-label-now-respects-use-clabeltext">
<h3><code class="docutils literal notranslate"><span class="pre">ContourLabeler.add_label</span></code> now respects <em>use_clabeltext</em><a class="headerlink" href="#contourlabeler-add-label-now-respects-use-clabeltext" title="Link to this heading">#</a></h3>
<p>... and sets <a class="reference internal" href="../text_api.html#matplotlib.text.Text.set_transform_rotates_text" title="matplotlib.text.Text.set_transform_rotates_text"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Text.set_transform_rotates_text</span></code></a> accordingly.</p>
</section>
<section id="line2d">
<h3><code class="docutils literal notranslate"><span class="pre">Line2D</span></code><a class="headerlink" href="#line2d" title="Link to this heading">#</a></h3>
<p>When creating a Line2D or using <a class="reference internal" href="../_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_xdata" title="matplotlib.lines.Line2D.set_xdata"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Line2D.set_xdata</span></code></a> and <a class="reference internal" href="../_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_ydata" title="matplotlib.lines.Line2D.set_ydata"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Line2D.set_ydata</span></code></a>,
passing x/y data as non sequence is now an error.</p>
</section>
<section id="scalarmappables-auto-scale-their-norm-when-an-array-is-set">
<h3><code class="docutils literal notranslate"><span class="pre">ScalarMappable</span></code>s auto-scale their norm when an array is set<a class="headerlink" href="#scalarmappables-auto-scale-their-norm-when-an-array-is-set" title="Link to this heading">#</a></h3>
<p>Collections previously deferred auto-scaling of the norm until draw time. This has been
changed to scale the norm whenever the first array is set to align with the docstring
and reduce unexpected behavior when accessing the norm before drawing.</p>
</section>
<section id="subplotparams-moved-from-matplotlib-figure-to-matplotlib-gridspec">
<h3><code class="docutils literal notranslate"><span class="pre">SubplotParams</span></code> moved from <code class="docutils literal notranslate"><span class="pre">matplotlib.figure</span></code> to <code class="docutils literal notranslate"><span class="pre">matplotlib.gridspec</span></code><a class="headerlink" href="#subplotparams-moved-from-matplotlib-figure-to-matplotlib-gridspec" title="Link to this heading">#</a></h3>
<p>It is still importable from <code class="docutils literal notranslate"><span class="pre">matplotlib.figure</span></code>, so does not require any changes to
existing code.</p>
</section>
<section id="powernorm-no-longer-clips-values-below-vmin">
<h3><code class="docutils literal notranslate"><span class="pre">PowerNorm</span></code> no longer clips values below vmin<a class="headerlink" href="#powernorm-no-longer-clips-values-below-vmin" title="Link to this heading">#</a></h3>
<p>When <code class="docutils literal notranslate"><span class="pre">clip=False</span></code> is set (the default) on <a class="reference internal" href="../_as_gen/matplotlib.colors.PowerNorm.html#matplotlib.colors.PowerNorm" title="matplotlib.colors.PowerNorm"><code class="xref py py-obj docutils literal notranslate"><span class="pre">PowerNorm</span></code></a>, values below
<code class="docutils literal notranslate"><span class="pre">vmin</span></code> are now linearly normalised. Previously they were clipped to zero. This fixes
issues with the display of colorbars associated with a power norm.</p>
</section>
<section id="image-path-semantics-of-toolmanager-based-tools">
<h3>Image path semantics of toolmanager-based tools<a class="headerlink" href="#image-path-semantics-of-toolmanager-based-tools" title="Link to this heading">#</a></h3>
<p>Previously, MEP22 ("toolmanager-based") Tools would try to load their icon
(<code class="docutils literal notranslate"><span class="pre">tool.image</span></code>) relative to the current working directory, or, as a fallback, from
Matplotlib's own image directory. Because both approaches are problematic for
third-party tools (the end-user may change the current working directory at any time,
and third-parties cannot add new icons in Matplotlib's image directory), this behavior
is deprecated; instead, <code class="docutils literal notranslate"><span class="pre">tool.image</span></code> is now interpreted relative to the directory
containing the source file where the <code class="docutils literal notranslate"><span class="pre">Tool.image</span></code> class attribute is defined.
(Defining <code class="docutils literal notranslate"><span class="pre">tool.image</span></code> as an absolute path also works and is compatible with both the
old and the new semantics.)</p>
</section>
</section>
<section id="deprecations">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Deprecations</a><a class="headerlink" href="#deprecations" title="Link to this heading">#</a></h2>
<section id="plot-date">
<h3><code class="docutils literal notranslate"><span class="pre">plot_date</span></code><a class="headerlink" href="#plot-date" title="Link to this heading">#</a></h3>
<p>Use of <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.plot_date.html#matplotlib.axes.Axes.plot_date" title="matplotlib.axes.Axes.plot_date"><code class="xref py py-obj docutils literal notranslate"><span class="pre">plot_date</span></code></a> has been discouraged since Matplotlib 3.5 and the function is
now formally deprecated.</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">datetime</span></code>-like data should directly be plotted using <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.plot.html#matplotlib.axes.Axes.plot" title="matplotlib.axes.Axes.plot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">plot</span></code></a>.</p></li>
<li><p>If you need to plot plain numeric data as <a class="reference internal" href="../dates_api.html#date-format"><span class="std std-ref">Matplotlib date format</span></a> or need to set a
timezone, call <code class="docutils literal notranslate"><span class="pre">ax.xaxis.axis_date</span></code> / <code class="docutils literal notranslate"><span class="pre">ax.yaxis.axis_date</span></code> before <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.plot.html#matplotlib.axes.Axes.plot" title="matplotlib.axes.Axes.plot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">plot</span></code></a>.
See <a class="reference internal" href="../_as_gen/matplotlib.axis.Axis.axis_date.html#matplotlib.axis.Axis.axis_date" title="matplotlib.axis.Axis.axis_date"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Axis.axis_date</span></code></a>.</p></li>
</ul>
</section>
<section id="id1">
<h3>Legend labels for <code class="docutils literal notranslate"><span class="pre">plot</span></code><a class="headerlink" href="#id1" title="Link to this heading">#</a></h3>
<p>Previously if a sequence was passed to the <em>label</em> parameter of <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.plot.html#matplotlib.axes.Axes.plot" title="matplotlib.axes.Axes.plot"><code class="xref py py-obj docutils literal notranslate"><span class="pre">plot</span></code></a> when
plotting a single dataset, the sequence was automatically cast to string for the legend
label. This behavior is now deprecated and in future will error if the sequence length
is not one (consistent with multi-dataset behavior, where the number of elements must
match the number of datasets). To keep the old behavior, cast the sequence to string
before passing.</p>
</section>
<section id="boxplot-tick-labels">
<h3><code class="docutils literal notranslate"><span class="pre">boxplot</span></code> tick labels<a class="headerlink" href="#boxplot-tick-labels" title="Link to this heading">#</a></h3>
<p>The parameter <em>labels</em> has been renamed to <em>tick_labels</em> for clarity and consistency
with <a class="reference internal" href="../_as_gen/matplotlib.axes.Axes.bar.html#matplotlib.axes.Axes.bar" title="matplotlib.axes.Axes.bar"><code class="xref py py-obj docutils literal notranslate"><span class="pre">bar</span></code></a>.</p>
</section>
<section id="mixing-positional-and-keyword-arguments-for-legend-handles-and-labels">
<h3>Mixing positional and keyword arguments for <code class="docutils literal notranslate"><span class="pre">legend</span></code> handles and labels<a class="headerlink" href="#mixing-positional-and-keyword-arguments-for-legend-handles-and-labels" title="Link to this heading">#</a></h3>
<p>This previously only raised a warning, but is now formally deprecated. If passing
<em>handles</em> and <em>labels</em>, they must be passed either both positionally or both as keyword.</p>
</section>
<section id="applying-theta-transforms-in-polartransform">
<h3>Applying theta transforms in <code class="docutils literal notranslate"><span class="pre">PolarTransform</span></code><a class="headerlink" href="#applying-theta-transforms-in-polartransform" title="Link to this heading">#</a></h3>
<p>Applying theta transforms in <a class="reference internal" href="../projections/polar.html#matplotlib.projections.polar.PolarTransform" title="matplotlib.projections.polar.PolarTransform"><code class="xref py py-obj docutils literal notranslate"><span class="pre">PolarTransform</span></code></a> and
<a class="reference internal" href="../projections/polar.html#matplotlib.projections.polar.InvertedPolarTransform" title="matplotlib.projections.polar.InvertedPolarTransform"><code class="xref py py-obj docutils literal notranslate"><span class="pre">InvertedPolarTransform</span></code></a> is deprecated, and will be
removed in a future version of Matplotlib. This is currently the default behaviour when
these transforms are used externally, but only takes affect when:</p>
<ul class="simple">
<li><p>An axis is associated with the transform.</p></li>
<li><p>The axis has a non-zero theta offset or has theta values increasing in a clockwise
direction.</p></li>
</ul>
<p>To silence this warning and adopt future behaviour, set
<code class="docutils literal notranslate"><span class="pre">apply_theta_transforms=False</span></code>. If you need to retain the behaviour where theta values
are transformed, chain the <code class="docutils literal notranslate"><span class="pre">PolarTransform</span></code> with a <a class="reference internal" href="../transformations.html#matplotlib.transforms.Affine2D" title="matplotlib.transforms.Affine2D"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Affine2D</span></code></a>
transform that performs the theta shift and/or sign shift.</p>
</section>
<section id="interval-parameter-of-timerbase-start">
<h3><em>interval</em> parameter of <code class="docutils literal notranslate"><span class="pre">TimerBase.start</span></code><a class="headerlink" href="#interval-parameter-of-timerbase-start" title="Link to this heading">#</a></h3>
<p>Setting the timer <em>interval</em> while starting it is deprecated. The interval can be
specified instead in the timer constructor, or by setting the <code class="docutils literal notranslate"><span class="pre">timer.interval</span></code>
attribute.</p>
</section>
<section id="nth-coord-parameter-to-axisartist-helpers-for-fixed-axis">
<h3><em>nth_coord</em> parameter to axisartist helpers for fixed axis<a class="headerlink" href="#nth-coord-parameter-to-axisartist-helpers-for-fixed-axis" title="Link to this heading">#</a></h3>
<p>Helper APIs in <a class="reference internal" href="../toolkits/axisartist.html#module-mpl_toolkits.axisartist" title="mpl_toolkits.axisartist"><code class="xref py py-obj docutils literal notranslate"><span class="pre">axisartist</span></code></a> for generating a "fixed" axis on rectilinear axes
(<a class="reference internal" href="../_as_gen/mpl_toolkits.axisartist.axislines.FixedAxisArtistHelperRectilinear.html#mpl_toolkits.axisartist.axislines.FixedAxisArtistHelperRectilinear" title="mpl_toolkits.axisartist.axislines.FixedAxisArtistHelperRectilinear"><code class="xref py py-obj docutils literal notranslate"><span class="pre">FixedAxisArtistHelperRectilinear</span></code></a>) no longer take a <em>nth_coord</em> parameter, as that
parameter is entirely inferred from the (required) <em>loc</em> parameter and having
inconsistent <em>nth_coord</em> and <em>loc</em> is an error.</p>
<p>For curvilinear axes, the <em>nth_coord</em> parameter remains supported (it affects the
<em>ticks</em>, not the axis position itself), but that parameter will become keyword-only, for
consistency with the rectilinear case.</p>
</section>
<section id="rcsetup-interactive-bk-rcsetup-non-interactive-bk-and-rcsetup-all-backends">
<h3><code class="docutils literal notranslate"><span class="pre">rcsetup.interactive_bk</span></code>, <code class="docutils literal notranslate"><span class="pre">rcsetup.non_interactive_bk</span></code> and <code class="docutils literal notranslate"><span class="pre">rcsetup.all_backends</span></code><a class="headerlink" href="#rcsetup-interactive-bk-rcsetup-non-interactive-bk-and-rcsetup-all-backends" title="Link to this heading">#</a></h3>
<p>... are deprecated and replaced by <code class="docutils literal notranslate"><span class="pre">matplotlib.backends.backend_registry.list_builtin</span></code>
with the following arguments</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">matplotlib.backends.BackendFilter.INTERACTIVE</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">matplotlib.backends.BackendFilter.NON_INTERACTIVE</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
</ul>
<p>respectively.</p>
</section>
<section id="miscellaneous-deprecations">
<h3>Miscellaneous deprecations<a class="headerlink" href="#miscellaneous-deprecations" title="Link to this heading">#</a></h3>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">backend_ps.get_bbox_header</span></code> is considered an internal helper</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">BboxTransformToMaxOnly</span></code>; if you rely on this, please make a copy of the code</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">ContourLabeler.add_label_clabeltext</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">TransformNode.is_bbox</span></code>; instead check the object using <code class="docutils literal notranslate"><span class="pre">isinstance(...,</span>
<span class="pre">BboxBase)</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">GridHelperCurveLinear.get_tick_iterator</span></code></p></li>
</ul>
</section>
</section>
<section id="removals">