Hey Mike,

I can expand my example. I have an orm mapped attribute like this

class Obj(Base):
    _evaluator = Column(String)

    def __init__(self, **kwargs):
        self._eval_func = eval(self._evaluator)

    def init_on_load(self):
        self._eval_func = eval(self._evaluator)

    def evaluator(self):
         return self._eval_func

    def set_evaluator(ev):
        self._evaluator = ev
        self._eval_func = eval(self._evaluator)

You can see that I have to explicitly set self._eval_func in three 
different places, when really I just want to set it every time 
self._evaluator is set.

It looks to me like the orm events are just a different way of placing the 
different settings of this class attribute

Also, I would like to not call eval in the getter of the property for the 
sake of performance (I know that would simplify the issue).

Is there a way to intercept the setting of self._evaluator for all cases?

SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper


To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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