title: bash: python: .py: command not found
body: <p>I am trying to run the following command in <code>QIIME2 virtual machine</code>, installed on macbook but the code is not working</p>
  
  <pre><code>validate_mapping_file.py -m Fasting_Map.txt -o mapping_output
  </code></pre>
  
  <p>Here is the link: <a href="http://qiime.org/tutorials/tutorial.html" rel="nofollow noreferrer">http://qiime.org/tutorials/tutorial.html</a></p>
  
  <p>I get the following message </p>
  
  <blockquote>
    <p>bash: validate_mapping_file.py: command not found</p>
  </blockquote>
  
  <p>I am new to <code>unix/linux</code> as well as on <code>qiime</code>. I would be very thankful for the help...</p>