code: def get_valid_time_stamp():
      
      time_stamp = str(datetime.datetime.now())
      time_stamp = "time_" + time_stamp.replace("-", "_").replace(":", "_").replace(" ", "_").replace(".", "_")
      return time_stamp
docs: Get a valid time stamp without illegal characters.
      Adds time_ to make the time stamp a valid table name in sql.
      :return: String, extracted timestamp