title: Python Splitting Array of Strings
body: <p>I have a list in Python that looks like this:</p>
  
  <pre><code>["Hello, My Name is John", "Good Afternoon, my name is David", "I am three years old"]
  </code></pre>
  
  <p>I would like to split each string into a comma-separated list and store the result, and also convert each word to lowercase:</p>
  
  <pre><code>[['hello','my','name','is','john'], ['good','afternoon','my','name','is','david'],['i','am','three','years','old']]
  </code></pre>
  
  <p>Any suggestions how this could be done? 
  Thank you.</p>