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Site updated at 2017-06-17 20:00:42 UTC

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<h1 class="title indent">
Python Scripts
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<p>This component allows you to write Python scripts that are exposed as services in Home Assistant. Each Python file created in the <code class="highlighter-rouge">&lt;config&gt;/python_scripts/</code> folder will be exposed as a service. The content is not cached so you can easily develop: edit file, save changes, call service. The scripts are run in a sandboxed environment. The following variables are available in the sandbox:</p>
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<th>Name</th>
<th>Description</th>
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<tr>
<td><code class="highlighter-rouge">hass</code></td>
<td>The Home Assistant object. Access is only allowed to call services, set/remove states and fire events. <a href="https://home-assistant.io/developers/development_hass_object/">API reference</a></td>
</tr>
<tr>
<td><code class="highlighter-rouge">data</code></td>
<td>The data passed to the Python Script service call.</td>
</tr>
<tr>
<td><code class="highlighter-rouge">logger</code></td>
<td>A logger to allow you to log messages: <code class="highlighter-rouge">logger.info()</code>, <code class="highlighter-rouge">logger.warning()</code>, <code class="highlighter-rouge">logger.error()</code>. <a href="https://docs.python.org/3.4/library/logging.html#logger-objects">API reference</a></td>
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<h2><a class="title-link" name="writing-your-first-script" href="#writing-your-first-script"></a> Writing your first script</h2>
<ul>
<li>Add to <code class="highlighter-rouge">configuration.yaml</code>: <code class="highlighter-rouge">python_script:</code></li>
<li>Create folder <code class="highlighter-rouge">&lt;config&gt;/python_scripts</code></li>
<li>Create a file <code class="highlighter-rouge">hello_world.py</code> in the folder and give it this content:</li>
</ul>
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="n">name</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">'name'</span><span class="p">,</span> <span class="s">'world'</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">"Hello {}"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="p">))</span>
<span class="n">hass</span><span class="o">.</span><span class="n">bus</span><span class="o">.</span><span class="n">fire</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="p">{</span> <span class="s">"wow"</span><span class="p">:</span> <span class="s">"from a Python script!"</span> <span class="p">})</span>
</code></pre>
</div>
<ul>
<li>Start Home Assistant</li>
<li>Call service <code class="highlighter-rouge">python_script/hello_world</code> with parameters</li>
</ul>
<div class="language-json highlighter-rouge"><pre class="highlight"><code><span class="p">{</span><span class="w">
</span><span class="nt">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"you"</span><span class="w">
</span><span class="p">}</span><span class="w">
</span></code></pre>
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