SQLAlchemy - model simple inheritance

Question

Is there anything wrong with inheritance in which child class is only used to present parent's values in a different way?

Example:

class Parent(db.Model):

    __tablename__ = u'parent'

    parent_entry_id = db.Column(db.Integer, primary_key=True)
    parent_entry_value = db.Column(db.BigInteger)

class Child(Parent):

   __tablename__ = u'child'

   @property
   def extra_value(self):
       return unicode(self.parent_entry_id) + unicode(self.parent_entry_value)

No new values will be added Child class, thus Joined Table, Single Table or Concrete Table Inheritance, as for me, is not needed.

Answer 1

If you're simply changing how you display the data from the class, I'm pretty sure you don't need a __tablename__ .

Additionally, though I don't know your exact problem domain, I would simply just add the property on the original class. You could argue that you're adding some extra behavior to your original class, but that seems like a bit of a flimsy argument in this case.