Display files from a directory in Flask

gistfile1.txt

@app.route('/photos/<photo_name>', methods = [ 'GET' ])                                                                                                                                       
def photos(photo_name):                                                                                                                                                                                                                                                                                                                                                                     
  return send_from_directory("/path/to/photos", photo_name, as_attachment=False)