title: How to use $PYTHONPATH to change cwd
body: <p>Goal: I want my run file <code>test_data_module.py</code> code via. bash in this working directory:</p>
  <pre class="lang-sh prettyprint-override"><code>/home/me/.ssh/workers-python/workers/ontology_tagger/ontology_tagger/tests
  </code></pre>
  <p>Attempts:</p>
  <pre class="lang-sh prettyprint-override"><code>PYTHONPATH=$PYTHONPATH:/home/danielbellio/.ssh/workers-python/workers/ontology_tagger/ontology_tagger/tests test_data_module.py
  </code></pre>
  <p>Error:</p>
  <pre class="lang-sh prettyprint-override"><code>bash: test_data_module.py: command not found
  </code></pre>