title: How to format a float with a comma as decimal separator in an f-string?
body: <p>For some machine control in python, I write the results to a text-file, that someone else can copy into Excel (this is the most convenient way in this situation). However, in the Netherlands, Excel has a comma as decimal separator and thus I want to have the result "position" in the text-file as 123,456, but when I use the f-string method like this:</p>
  
  <pre><code>    resultfile.write(f"Position\t{position:.5}")
  </code></pre>
  
  <p>This will obviously result in a dot decimal separator.</p>
  
  <p>How can I change this to a comma without iterating through the whole file int the end and replace the dots with commas?</p>