title: win32com: work with excel file by opening it in background
body: <p>So I use following code to open an existing excel file. Even though I make visible to False, but this always open the excel file UI. However I want to run it in the background. How can I do that?</p>
  
  <pre><code>import win32com.client as win32
  excel = win32.gencache.EnsureDispatch('Excel.Application')
  wb = excel.Workbooks.Open('my_sheet.xlsm')
  excel.Visible = False
  </code></pre>