title: Export an excel file using a variable name in Python
body: <p>I am new to python, trying to figure out dynamic naming of exported files. Right now, I am exporting an xlsx file in a traditional way:</p>
  
  <p>data_subset.to_csv('Destination/existing_process.csv')</p>
  
  <p>I have a string called 'user_name' and the resultant tuple for every user is exported into an excel file called existing_process. Instead of the name existing_process, I would like to rename the file dynamically using the string user_name. </p>
  
  <p>For instance, for a given user_name 'Matt' I would like the exported file to be named as Matt.csv. Thanks! </p>