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  <section id="python-single-r1-single-impl-packages">
<h1>python-single-r1 — single-impl packages<a class="headerlink" href="#python-single-r1-single-impl-packages" title="Permalink to this heading"></a></h1>
<p>The <code class="docutils literal notranslate"><span class="pre">python-single-r1</span></code> eclass is used to install single-impl packages.
It is probably the easiest eclass to use, and it is recommended over
<code class="docutils literal notranslate"><span class="pre">python-r1</span></code> whenever multi-impl support would add unnecessary
complexity.  However, for packages using distutils or a similar Python
build system, <code class="docutils literal notranslate"><span class="pre">distutils-r1</span></code> eclass should be used instead.</p>
<p>Eclass reference: <a class="reference external" href="https://devmanual.gentoo.org/eclass-reference/python-single-r1.eclass/index.html">python-single-r1.eclass(5)</a></p>
<section id="basic-use-for-unconditional-python">
<h2>Basic use for unconditional Python<a class="headerlink" href="#basic-use-for-unconditional-python" title="Permalink to this heading"></a></h2>
<p>The defining feature of this eclass is that it defines a <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code>
phase.  It normally calls <code class="docutils literal notranslate"><span class="pre">python_setup</span></code> function in order
to determine the interpreter selected by user, and set the global
environment appropriately.</p>
<p>This means that a most trivial package using an autotools-compatible
build system along with unconditional dependency on Python could look
like the following:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> <span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
 <span class="c1"># Distributed under the terms of the GNU General Public License v2</span>

 <span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>

<span class="hll"> <span class="nv">PYTHON_COMPAT</span><span class="o">=(</span> python2_7 <span class="o">)</span>
</span><span class="hll"> inherit python-single-r1
</span>
 <span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">&quot;Scripts to prepare and plot VOACAP propagation predictions&quot;</span>
 <span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">&quot;https://www.qsl.net/h/hz1jw//pythonprop/&quot;</span>
 <span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">&quot;mirror://sourceforge/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz&quot;</span>

 <span class="nv">LICENSE</span><span class="o">=</span><span class="s2">&quot;GPL-2+&quot;</span>
 <span class="nv">SLOT</span><span class="o">=</span><span class="s2">&quot;0&quot;</span>
 <span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">&quot;~amd64 ~x86&quot;</span>
 <span class="nv">IUSE</span><span class="o">=</span><span class="s2">&quot;&quot;</span>
<span class="hll"> <span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2">&quot;</span>
</span>
 <span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="hll"><span class="s2">     </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"></span>
</span><span class="s2">     ...</span>
<span class="s2"> &quot;</span>
 <span class="nv">BDEPEND</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span><span class="s2">&quot;</span>
</pre></div>
</div>
<p>This ebuild demonstrates the absolute minimum working code.  Only
the four highlighted lines are specific to Python eclasses, plus
the implicitly exported <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code> phase.</p>
<span class="target" id="index-0"></span><span class="target" id="index-1"></span></section>
<section id="dependencies">
<span id="index-2"></span><h2>Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this heading"></a></h2>
<p>When depending on other Python packages, USE dependencies need to be
declared in order to ensure that the dependencies would be built against
the Python implementation used for the package.  The exact dependency
string depends on whether the target package is single-impl
or multi-impl.</p>
<p>When depending on other single-impl packages, the eclass-defined
<code class="docutils literal notranslate"><span class="pre">${PYTHON_SINGLE_USEDEP}</span></code> variable can be used to inject the correct
USE dependency:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="s2">    ...</span>
<span class="s2">    dev-python/basemap[</span><span class="si">${</span><span class="nv">PYTHON_SINGLE_USEDEP</span><span class="si">}</span><span class="s2">]</span>
<span class="s2">&quot;</span>
</pre></div>
</div>
<p>When depending on multi-impl packages, a more complex construct must
be used.  The <code class="docutils literal notranslate"><span class="pre">python_gen_cond_dep</span></code> generator function is used
to copy the specified dependency template for all supported
implementations, and substitute <code class="docutils literal notranslate"><span class="pre">${PYTHON_USEDEP}</span></code> template inside
it:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="s2">    ...</span>
<span class="s2">    </span><span class="k">$(</span>python_gen_cond_dep <span class="s1">&#39;</span>
<span class="s1">        dev-python/matplotlib-python2[gtk2,${PYTHON_USEDEP}]</span>
<span class="s1">    &#39;</span><span class="k">)</span><span class="s2"></span>
<span class="s2">&quot;</span>
</pre></div>
</div>
<p>Please note that in this context, <code class="docutils literal notranslate"><span class="pre">${...}</span></code> is used as a literal
template substitution key, so it must be escaped to prevent bash from
substituting it immediately.  In the above example, single quotes
are used for this purpose.  When other variables are used, double quotes
with explicit escapes have to be used:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="s2">    ...</span>
<span class="s2">    </span><span class="k">$(</span>python_gen_cond_dep <span class="s2">&quot;</span>
<span class="s2">        dev-python/wxpython:</span><span class="si">${</span><span class="nv">WX_GTK_VER</span><span class="si">}</span><span class="s2">[\${PYTHON_USEDEP}]</span>
<span class="s2">    &quot;</span><span class="k">)</span><span class="s2">&quot;</span>
</pre></div>
</div>
<p>As demonstrated above, the USE dependency string can be combined with
other USE dependencies.  <code class="docutils literal notranslate"><span class="pre">PYTHON_SINGLE_USEDEP</span></code> can be used both
inside and outside <code class="docutils literal notranslate"><span class="pre">python_gen_cond_dep</span></code>, while <code class="docutils literal notranslate"><span class="pre">PYTHON_USEDEP</span></code> only
inside it.</p>
</section>
<section id="conditional-python-use">
<h2>Conditional Python use<a class="headerlink" href="#conditional-python-use" title="Permalink to this heading"></a></h2>
<p>The examples so far assumed that Python is used unconditionally.
If Python support is conditional to a USE flag, appropriate USE
conditionals need to be used in metadata variables, and <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code>
needs to be rewritten to call the default implementation conditionally:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> <span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
 <span class="c1"># Distributed under the terms of the GNU General Public License v2</span>

 <span class="nv">EAPI</span><span class="o">=</span><span class="m">6</span>

 <span class="nv">PYTHON_COMPAT</span><span class="o">=(</span> python2_7 <span class="o">)</span>
 inherit python-single-r1

 <span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">&quot;Yet more Objects for (High Energy Physics) Data Analysis&quot;</span>
 <span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">&quot;http://yoda.hepforge.org/&quot;</span>
 <span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">&quot;http://www.hepforge.org/archive/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.bz2&quot;</span>

 <span class="nv">LICENSE</span><span class="o">=</span><span class="s2">&quot;GPL-2&quot;</span>
 <span class="nv">SLOT</span><span class="o">=</span><span class="s2">&quot;0/</span><span class="si">${</span><span class="nv">PV</span><span class="si">}</span><span class="s2">&quot;</span>
 <span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">&quot;~amd64 ~x86 ~amd64-linux ~x86-linux&quot;</span>
<span class="hll"> <span class="nv">IUSE</span><span class="o">=</span><span class="s2">&quot;python root&quot;</span>
</span><span class="hll"> <span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">&quot;python? ( </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2"> )&quot;</span>
</span>
 <span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="hll"><span class="s2">     python? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )</span>
</span><span class="hll"><span class="s2">     root? ( sci-physics/root:=[python=,</span><span class="si">${</span><span class="nv">PYTHON_SINGLE_USEDEP</span><span class="si">}</span><span class="s2">] )&quot;</span>
</span> <span class="nv">DEPEND</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span><span class="s2"></span>
<span class="hll"><span class="s2">     python? (</span>
</span><span class="hll"><span class="s2">         </span><span class="k">$(</span>python_gen_cond_dep <span class="s1">&#39;</span>
</span><span class="hll"><span class="s1">             dev-python/cython[${PYTHON_USEDEP}]</span>
</span><span class="hll"><span class="s1">         &#39;</span><span class="k">)</span><span class="s2"></span>
</span><span class="hll"><span class="s2">     )&quot;</span>
</span>
 pkg_setup<span class="o">()</span> <span class="o">{</span>
<span class="hll">     use python <span class="o">&amp;&amp;</span> python-single-r1_pkg_setup
</span> <span class="o">}</span>

 src_configure<span class="o">()</span> <span class="o">{</span>
     econf <span class="se">\</span>
<span class="hll">         <span class="k">$(</span>use_enable python pyext<span class="k">)</span> <span class="se">\</span>
</span>         <span class="k">$(</span>use_enable root<span class="k">)</span>
 <span class="o">}</span>
</pre></div>
</div>
</section>
<section id="a-hybrid-build-time-conditional-runtime">
<h2>A hybrid: build-time + conditional runtime<a class="headerlink" href="#a-hybrid-build-time-conditional-runtime" title="Permalink to this heading"></a></h2>
<p>A fairly common pattern is for Python to be required unconditionally
at build time but only conditionally at runtime.  This happens e.g. when
the package is calling some helper scripts at build time, and optionally
installing Python bindings.  In this case, the build time dependency
is expressed unconditionally, and the runtime dependency is made
USE-conditional:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> <span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
 <span class="c1"># Distributed under the terms of the GNU General Public License v2</span>

 <span class="nv">EAPI</span><span class="o">=</span><span class="m">6</span>

 <span class="nv">PYTHON_COMPAT</span><span class="o">=(</span> python3_<span class="o">{</span><span class="m">6</span>,7,8<span class="o">}</span> <span class="o">)</span>
 <span class="nv">PYTHON_REQ_USE</span><span class="o">=</span><span class="s2">&quot;threads(+)&quot;</span>

 inherit waf-utils python-single-r1

 <span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">&quot;Samba talloc library&quot;</span>
 <span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">&quot;https://talloc.samba.org/&quot;</span>
 <span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">&quot;https://www.samba.org/ftp/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz&quot;</span>

 <span class="nv">LICENSE</span><span class="o">=</span><span class="s2">&quot;GPL-3 LGPL-3+ LGPL-2&quot;</span>
 <span class="nv">SLOT</span><span class="o">=</span><span class="s2">&quot;0&quot;</span>
 <span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">&quot;~alpha amd64 arm ~arm64 ~hppa ia64 ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sh ~sparc x86 ~amd64-linux ~x86-linux ~x64-macos ~sparc-solaris ~x64-solaris&quot;</span>
<span class="hll"> <span class="nv">IUSE</span><span class="o">=</span><span class="s2">&quot;+python&quot;</span>
</span><span class="hll"> <span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2">&quot;</span>
</span>
 <span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="s2">     ...</span>
<span class="hll"><span class="s2">     python? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )&quot;</span>
</span> <span class="nv">DEPEND</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span><span class="s2"></span>
<span class="s2">     ...</span>
<span class="hll"><span class="s2">     </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2">&quot;</span>
</span>
 <span class="nv">WAF_BINARY</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">S</span><span class="si">}</span><span class="s2">/buildtools/bin/waf&quot;</span>

 src_configure<span class="o">()</span> <span class="o">{</span>
     <span class="nb">local</span> <span class="nv">extra_opts</span><span class="o">=(</span>
<span class="hll">         <span class="k">$(</span>usex python <span class="s1">&#39;&#39;</span> --disable-python<span class="k">)</span>
</span>     <span class="o">)</span>
     waf-utils_src_configure <span class="s2">&quot;</span><span class="si">${</span><span class="nv">extra_opts</span><span class="p">[@]</span><span class="si">}</span><span class="s2">&quot;</span>
 <span class="o">}</span>
</pre></div>
</div>
<p>Note that eclass-exported <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code> is used unconditionally here.</p>
</section>
<section id="multiple-use-conditions">
<h2>Multiple USE conditions<a class="headerlink" href="#multiple-use-conditions" title="Permalink to this heading"></a></h2>
<p>Finally, let’s give an example of a package where Python is needed
for two independent conditions.  To make it more complex, one of them
applies to build time (tests) while the other to runtime (bindings).</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> <span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
 <span class="c1"># Distributed under the terms of the GNU General Public License v2</span>

 <span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>

 <span class="nv">PYTHON_COMPAT</span><span class="o">=(</span> python3_<span class="o">{</span><span class="m">6</span>,7,8<span class="o">}</span> <span class="o">)</span>
 inherit cmake python-single-r1

 <span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">&quot;Sound design and signal processing system for composition and performance&quot;</span>
 <span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">&quot;https://csound.github.io/&quot;</span>
 <span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">&quot;https://dev.gentoo.org/~fordfrog/distfiles/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">-distributable.tar.xz&quot;</span>

 <span class="nv">LICENSE</span><span class="o">=</span><span class="s2">&quot;LGPL-2.1 doc? ( FDL-1.2+ )&quot;</span>
 <span class="nv">SLOT</span><span class="o">=</span><span class="s2">&quot;0&quot;</span>
 <span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">&quot;~amd64 ~x86&quot;</span>
<span class="hll"> <span class="nv">IUSE</span><span class="o">=</span><span class="s2">&quot;python test&quot;</span>
</span> <span class="nv">RESTRICT</span><span class="o">=</span><span class="s2">&quot;!test? ( test )&quot;</span>
 <span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="hll"><span class="s2">     python? ( </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2"> )</span>
</span><span class="hll"><span class="s2">     test? ( </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2"> )&quot;</span>
</span>
 <span class="nv">BDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="s2">     python? ( dev-lang/swig )</span>
<span class="hll"><span class="s2">     test? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )</span>
</span><span class="s2"> &quot;</span>
 <span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span>
<span class="hll"><span class="s2">     python? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )</span>
</span><span class="s2"> &quot;</span>

 pkg_setup<span class="o">()</span> <span class="o">{</span>
<span class="hll">     <span class="k">if</span> use python <span class="o">||</span> use <span class="nb">test</span> <span class="p">;</span> <span class="k">then</span>
</span><span class="hll">         python-single-r1_pkg_setup
</span><span class="hll">     <span class="k">fi</span>
</span> <span class="o">}</span>

 src_configure<span class="o">()</span> <span class="o">{</span>
     <span class="nb">local</span> <span class="nv">mycmakeargs</span><span class="o">=(</span>
<span class="hll">         -DBUILD_PYTHON_INTERFACE<span class="o">=</span><span class="k">$(</span>usex python<span class="k">)</span>
</span><span class="hll">         -DBUILD_PYTHON_OPCODES<span class="o">=</span><span class="k">$(</span>usex python<span class="k">)</span>
</span>     <span class="o">)</span>

     cmake_src_configure
 <span class="o">}</span>
</pre></div>
</div>
<p>Please note that in general, the condition in <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code> must match
the one in <code class="docutils literal notranslate"><span class="pre">REQUIRED_USE</span></code>, and that one is a superset of conditions
used in dependencies.</p>
</section>
<section id="manual-install">
<h2>Manual install<a class="headerlink" href="#manual-install" title="Permalink to this heading"></a></h2>
<p>Some packages do not include Python files in their build systems,
or do not install all of them.  In this case, the necessary files
can be installed via one of the installation helpers.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span> <span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
 <span class="c1"># Distributed under the terms of the GNU General Public License v2</span>

 <span class="nv">EAPI</span><span class="o">=</span><span class="m">6</span>

 <span class="nv">PYTHON_COMPAT</span><span class="o">=(</span> python2_7 <span class="o">)</span>
 inherit python-single-r1

 <span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">&quot;Arabic dictionary based on the DICT protocol&quot;</span>
 <span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">&quot;https://www.arabeyes.org/Duali&quot;</span>
 <span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">&quot;mirror://sourceforge/arabeyes/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.bz2&quot;</span>

 <span class="nv">LICENSE</span><span class="o">=</span><span class="s2">&quot;BSD&quot;</span>
 <span class="nv">SLOT</span><span class="o">=</span><span class="s2">&quot;0&quot;</span>
 <span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">&quot;~alpha amd64 ~hppa ~ia64 ~mips ~ppc ~sparc x86&quot;</span>
 <span class="nv">IUSE</span><span class="o">=</span><span class="s2">&quot;&quot;</span>
 <span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2">&quot;</span>

 <span class="nv">DEPEND</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2">&quot;</span>
 <span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">DEPEND</span><span class="si">}</span><span class="s2">&quot;</span>

 src_install<span class="o">()</span> <span class="o">{</span>
<span class="hll">     python_domodule pyduali
</span><span class="hll">     python_doscript duali dict2db trans2arabic arabic2trans
</span> <span class="o">}</span>
</pre></div>
</div>
</section>
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