code: def __str__(self):
      msg = f"{self.alias_name}"
      if len(self.col_names) > 0:
          msg += f"({str(self.col_names)})"
      return msg
  
imports: from typing import List
label_desc: Use image node_id 6 for calling the Alias obj's underlying member method code with example usage: obj.__str__() and returns: msg