title: Python DataFrame ExcelWriter, returns an error
body: <p>I am trying to over-write specific tabs in an excel file (leaving the rest intact). I am trying to copy synatx from the documentation but I get an error.</p>
  <pre><code>with ExcelWriter('C:\\Users\Tiki\Desktop\work\VFT Technicals\Production2\dashboard_v2.xlsx') as writer: 
      output_rsi.to_excel(writer,sheet_name='rsi')
  </code></pre>
  <p>This returns the error:</p>
  <pre><code>NameError: name 'ExcelWriter' is not defined
  </code></pre>
  <p>Hoping for some advice, I am very much a beginner at coding.</p>
  <p>Thanks in advance.</p>