code: def gen_data_files(src_dir):
      
      fpaths = []
      base = os.path.dirname(src_dir)
      for root, dir, files in os.walk(src_dir):
          if len(files) != 0:
              for f in files:
                  fpaths.append(os.path.relpath(os.path.join(root, f), base))
      return fpaths
docs: generates a list of files contained in the given directory (and its
      subdirectories) in the format required by the ``package_data`` parameter
      of the ``setuptools.setup`` function.
  
      Parameters
      ----------
      src_dir : str
          (relative) path to the directory structure containing the files to
          be included in the package distribution
  
      Returns
      -------
      fpaths : list(str)
          a list of file paths