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<li><a class="reference internal" href="#">Minimum Version of Dependencies Policy</a><ul>
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<div class="section" id="minimum-version-of-dependencies-policy">
<span id="min-deps-policy"></span><h1>Minimum Version of Dependencies Policy<a class="headerlink" href="#minimum-version-of-dependencies-policy" title="Permalink to this headline">¶</a></h1>
<p>For the purpose of this document, 'minor version' is in the sense of
SemVer (major, minor, patch) and includes both major and minor
releases. For projects that use date-based versioning, every release
is a 'minor version'.</p>
<div class="section" id="python-and-numpy">
<h2>Python and numpy<a class="headerlink" href="#python-and-numpy" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>support minor versions of <code class="docutils literal notranslate"><span class="pre">Python</span></code> initially released
36 months prior to our planned release date.</li>
<li>support minor versions of <code class="docutils literal notranslate"><span class="pre">numpy</span></code> initially released in the 36
months prior to our planned release date or oldest that supports the
minimum python version (which ever is higher)</li>
</ul>
<p>We will bump the minimum python and numpy versions as we can every
minor and major release, but never on a patch release.</p>
</div>
<div class="section" id="python-dependencies">
<h2>Python Dependencies<a class="headerlink" href="#python-dependencies" title="Permalink to this headline">¶</a></h2>
<p>For python dependencies we should support at least:</p>
<dl class="docutils">
<dt>with compiled extensions</dt>
<dd>minor versions initially released in the 36 months prior to our
planned release date or the oldest that support our minimum python +
numpy</dd>
<dt>without complied extensions</dt>
<dd>minor versions initially released in the 24 months prior to our
planed release date or the oldest that supports our minimum python.</dd>
</dl>
<p>We will only bump these dependencies as we need new features or the
old versions no longer support our minimum numpy or python.</p>
</div>
<div class="section" id="test-and-documentation-dependencies">
<h2>Test and Documentation Dependencies<a class="headerlink" href="#test-and-documentation-dependencies" title="Permalink to this headline">¶</a></h2>
<p>As these packages are only needed for testing or building the docs and
not needed by end-users, we can be more aggressive about dropping
support for old versions. However, we need to be careful to not
over-run what down-stream packagers support (as most of the run the
tests and build the documentation as part of the packaging process).</p>
<p>We will support at least minor versions of the development
dependencies released in the 12 months prior to our planned release.</p>
<p>We will only bump these as needed or versions no longer support our
minimum Python and numpy.</p>
</div>
<div class="section" id="system-and-c-dependencies">
<h2>System and C-dependencies<a class="headerlink" href="#system-and-c-dependencies" title="Permalink to this headline">¶</a></h2>
<p>For system or c-dependencies (libpng, freetype, GUI frameworks, latex,
gs, ffmpeg) support as old as practical. These can be difficult to
install for end-users and we want to be usable on as many systems as
possible. We will bump these on a case-by-case basis.</p>
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