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<h1 id="build-a-python-executable-pex">Build a Python Executable (PEX)</h1>
<h2 id="problem">Problem</h2>
<p>You need to create an executable <code>.pex</code> Python binary (aka a "PEX") out of Python source code. </p>
<p>For more on PEX files see: <a href="https://github.com/pantsbuild/pex">https://github.com/pantsbuild/pex</a></p>
<p>If you need to create a Python library target instead, see <a href="python_library.html">Define a Python Library Target</a>.</p>
<h2 id="solution">Solution</h2>
<p>Define a <code>python_binary</code> target that you can build as a PEX using the <code>binary</code> goal:</p>
<div class="codehilite"><pre><span class="nv">$ </span>./pants binary myproject/src/python:my-python-binary
</pre></div>
<h2 id="discussion">Discussion</h2>
<p>In a <code>python_ binary</code> target, you should specify:</p>
<ul>
<li>A <code>name</code> for the PEX</li>
<li>A <code>source</code> Python file that contains a <code>main</code> function</li>
<li>A list of <code>dependencies</code> (optional). This list should include only Python <a href="python_library.html">library targets</a> within the same project, <em>not</em> third-party dependencies. Any third-party dependencies should be specified in library targets.</li>
</ul>
<p><strong>Note</strong>: As an alternative to specifying a <code>source</code> file, you can define an <code>entry_point</code> function in your <code>python_binary</code> target. For example, specifying <code>entry_point='main:run'</code> would mean that the <code>main</code> function for the binary is the <code>run()</code> function contained in <code>main.py</code>.</p>
<p>Here's an example <code>python_binary</code> target:</p>
<div class="codehilite"><pre><span class="n">python_library</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'myproject-lib'</span><span class="p">,</span>
<span class="c"># Other parameters</span>
<span class="p">)</span>
<span class="n">python_binary</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'myproject-bin'</span><span class="p">,</span>
<span class="n">source</span><span class="o">=</span><span class="s">'main.py'</span><span class="p">,</span>
<span class="n">dependencies</span><span class="o">=</span><span class="p">[</span>
<span class="s">':myproject-lib'</span>
<span class="p">]</span>
<span class="p">)</span>
</pre></div>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="run.html">Run a Binary Target</a></li>
<li><a href="python_library.html">Define a Python Library Target</a></li>
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