title: Read the cell value
body: <p>When I use the simple example of the documentation web:</p>
  
  <pre><code>wb = load_workbook(filename= 'fileroute.xlsm' )
  sheet_ranges = wb['Export_PM']
  print((sheet_ranges['B5'].value))
  </code></pre>
  
  <p>the script provide me the reference to another cell in a different worksheet.</p>
  
  <pre><code>=Calculo_PM!AK20
  </code></pre>
  
  <p>How can I obtaint the value not the 'link' or reference to the cell where the value is obtained ?</p>
  
  <p>thanks</p>