old_contents: #!/usr/bin/env python3
  from ietf.sql.base import Base
  from sqlalchemy import Column, Integer, String
  
  
  class Std(Base):
      __tablename__ = 'std'
  
      id = Column(Integer, primary_key=True)
      title = Column(String, nullable=False)
  
      def __repr__(self):
          return "StdEntry(id=STD{}, title={}".format(
              self.id, self.title)
  
new_contents: #!/usr/bin/env python3
  from ietf.sql.base import Base
  from sqlalchemy import Column, Integer, String
  
  
  class Std(Base):
      __tablename__ = 'std'
  
      id = Column(Integer, primary_key=True)
      title = Column(String, nullable=False)
  
      def __repr__(self):
          # `{:<18}` left-aligns in 18 columns
          fmt = "{:<18} : {}"
          # `{:0>4}` right-aligns in 4 columns with leading 0
          repr_str = fmt.format('STD', "{:0>4}".format(self.id))
          repr_str += '\n'
          repr_str += fmt.format('Title', self.title)
  
          return repr_str
  
subject: Update `__repr__()`