Converting an instance to a subclass?
tjreedy at udel.edu
Fri Feb 16 23:46:58 CET 2001
> Is there a way I can cast the instances of class A into instances of
> class B so I can use the additional methods
Is this what you want (with 1.5.2)?
>>> class a: pass
>>> class b(a): pass
>>> i = a()
<class __main__.a at 7934f0>
>>> i.__class__ = b
<class __main__.b at 7932b0>
> I can't find anything about it in "Programming Python"
I believe that __class__ became writeable after that was written -- or it
may have been too esoteric (and dangerous) to include.
Terry J. Reedy
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