updated comments.

ibr1.py

@@ -97,6 +97,9 @@ class Zipcode(db.Model):
 api = Api(app)
 
 def model_to_dict(model):
+    """ Given a SQLAlchemy model, return a dictionary.
+    This allows for the model to be easily jsonified.
+    """
     data = {}
     for col in model.__table__.c.keys():
         # data[col] = getattr(c, col, None) # c[col]