Is there a technique or pattern for taking a (partially-) populated
instance of a class, and re-creating it as an instance of one of its
sub-classes?
In a medically-oriented situation, we have a Person() class, and start
collecting information within an instance (person = Person(), etc).
During the data-collection process the person's sex may become obvious,
eg few males have become/been pregnant.
We could stick with Person() and implement specific methods therein,
rather than separate Man and Woman sub-classes, but...
It seemed better (at the design-level) to have Man( Person ) and Woman(
Person ) sub-classes to contain the pertinent attributes, source more
detailed and specific questions, and collect such data; by gender.
In coding-practice, once gender becomes apparent, how should the
instance of the Man() or Woman() sub-class be created - and established
with the ID and other attributes previously collected as a Person instance?
This attempt seems hack-y:
man = Man()
man.__dict__.update( person.__dict__ )
Is there a pythonic tool for such, or is the task outlined
fundamentally-inappropriate?
--
Regards,
=dn
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