title: Splitting string elements of an array in python to characters
body: <p>I'm still new in Python and solution might be simple however I feel stuck. I have an array likes this:</p>
  
  <pre><code>array([['one two'],
         ['three four'],
         ['five six'],
         ['seven eight']], dtype='&lt;U9')
  </code></pre>
  
  <p>I can't figure out how to split it to make it look like this:</p>
  
  <pre><code>array([['o', 'n', 'e', 't', 'w', 'o'],
         ['t', 'h', 'r', 'e', 'e', 'f', 'o', 'u', 'r'],
         ['f', 'i', 'v', 'e', 's', 'i', 'x'],
         ['s', 'e', 'v', 'e', 'n', 'e', 'i', 'g', 'h', 't']])
  </code></pre>
  
  <p>I tried splitting it while converting this array to a list however I couldn't figure it out how to convert it back to an array like the one above. Thank you in advance for the help! </p>