Instantiating sub-class from super

[Rhodri James]

On 14/10/2019 21:55, DL Neil via Python-list wrote:
> 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.

Knowing a lot of Trans people as I do, may I gently suggest that this 
solution will find many and varied ways of coming back to bite you?

-- 
Rhodri James *-* Kynesim Ltd