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<div class="section" id="how-to-run-a-python-file">
<span id="id1"></span><h1>How to run a python file<a class="headerlink" href="#how-to-run-a-python-file" title="Permalink to this headline">¶</a></h1>
<p>A file with python code in it is a ‘module’ or ‘script’</p>
<p>(more on the distinction later on…)</p>
<p>It should be named with the <code class="docutils literal notranslate"><span class="pre">.py</span></code> extension: <code class="docutils literal notranslate"><span class="pre">some_name.py</span></code></p>
<p>If you want to run the code directly (it is a script), you have a couple options:</p>
<ol class="arabic simple">
<li><p>call python on the command line, and pass in your module name</p></li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ python3 the_name_of_the_script.py
</pre></div>
</div>
<ol class="arabic" start="2">
<li><p>On *nix (linux, OS-X, Windows bash), you can make the file “executable”:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ chmod +x the_file.py
</pre></div>
</div>
<p>And make sure it has a “shebang” line at the top:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/env python</span>
</pre></div>
</div>
<p>Then you can run it directly:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">./</span><span class="n">the_file</span><span class="o">.</span><span class="n">py</span>
</pre></div>
</div>
</li>
<li><p>On Windows, the <cite>.py</cite> extensions can be associated with the python interpreter, so it can be run directly. This is clunkier than the *nix “shebang line” approach, so I don’t recommend it – but it is an option. But Windows does come with the “py” executable, that will examine a python file, look for a “shebang” line, and then run your file with the right executable.</p></li>
<li><p>run <code class="docutils literal notranslate"><span class="pre">ipython</span></code>, and run it from within iPython with the <code class="docutils literal notranslate"><span class="pre">run</span></code> command</p></li>
</ol>
<div class="highlight-ipython notranslate"><div class="highlight"><pre><span></span><span class="gp">In [1]: </span><span class="n">run</span> <span class="n">the_file</span><span class="o">.</span><span class="n">py</span>
</pre></div>
</div>
<ol class="arabic simple" start="5">
<li><p>Various IDEs (PyCharm, IDLE, etc) have a way to run the module you are currently editing – if you use one of these tools, learn how to do that. Make sure that it is using the version of Python that you want it to be.</p></li>
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