title: How to put a value to an excel cell?
body: <p>You'll probably laugh at me, but I am sitting on this for two weeks. I'm using python with pandas.</p>
  
  <p>All I want to do, is to put a calculated value in a pre-existing excel file to a specific cell without changing the rest of the file. That's it. </p>
  
  <p>Openpyxl makes my file unusable (means, I can not open because it's "corrupted" or something) or it plainly delets the whole content of the file. Xlsxwriter cannot read or modify pre-existing files. So it has to be pandas.</p>
  
  <p>And for some reason I can't use <code>worksheet = writer.sheets['Sheet1']</code>, because that leads to an "unhandled exception".</p>
  
  <p>Guys. Help.</p>