code: def create_tar_file(source_files, target=None):
      
      if target:
          filename = target
      else:
          _, filename = tempfile.mkstemp()
  
      with tarfile.open(filename, mode='w:gz') as t:
          for sf in source_files:
              # Add all files from the directory into the root of the directory structure of the tar
              t.add(sf, arcname=os.path.basename(sf))
      return filename
docs: Create a tar file containing all the source_files
  
      Args:
          source_files (List[str]): List of file paths that will be contained in the tar file
  
      Returns:
           (str): path to created tar file