code: def placeholders(cls,dic):
          
          keys = [str(x) for x in dic]
          entete = ",".join(keys)
          placeholders = ",".join(cls.named_style.format(x) for x in keys)
          entete = f"({entete})"
          placeholders = f"({placeholders})"
          return entete, placeholders
docs: Placeholders for fields names and value binds