docs: def get_file(fname, datapath=datapath):
      """Return path of an example data file
  
      Return the full path to an example data file name.
      If the file does not exist in the `datapath` directory,
      tries to download it from the ODTbrain GitHub repository.
      """
      # download location
      datapath = pathlib.Path(datapath)
      datapath.mkdir(parents=True, exist_ok=True)
  
      dlfile = datapath / fname
      if not dlfile.exists():
          print("Attempting to download file {} from {} to {}.".
                format(fname, webloc, datapath))
          try:
              dl_file(url=webloc+fname, dest=dlfile)
          except BaseException:
              warnings.warn("Download failed: {}".format(fname))
              raise
      return dlfile