title: extract excel columns into python array
body: <p>I want to extract excel columns (NOT rows) into python arrays of array. It has to be arrays, not dictionaries.</p>
  
  <p>The excel file looks like this:</p>
  
  <pre><code>     A    B    C
  1   123  534  576
  2   456  745  345
  3   234  765  285
  </code></pre>
  
  <p>I want to bring this into python in the following format:</p>
  
  <pre><code>[[123,534,576],[456,745,345],[234,765,285]]
  </code></pre>
  
  <p>How would I do this? Thank you</p>