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<li><a class="reference internal" href="#">Minimum Version of Dependencies Policy</a><ul>

<li><a class="reference internal" href="#python-and-numpy">Python and numpy</a></li>

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<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>

<h2>Python and numpy<a class="headerlink" href="#python-and-numpy" title="Permalink to this headline">¶</a></h2>

<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>

<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>

<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>

<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>

<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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Last updated on May 18, 2019.

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