Convert a BaseClass object into a SubClass object idiomatically?

Question

There is a base class Base and a subclass Special.

class Base(object):
    def __init__(self, name):
        self.name = name
    d         


        

Answer 1

actually you can, but I don't think you should. instead of typecasting python has duck-typing to solve this kind of situation.

anyway, here's the code:

>>> base = Base("I'm a base!")
>>> hasattr(base, 'rhyme')
False
>>> base.__class__ = Special
>>> hasattr(base, 'rhyme')
True
>>> base.rhyme()
"Hi I'm a base!! How are you? Fine, thanks. What about you?"