On 11 Jan 2007 15:01:48 +0100, Neil Cerutti <[EMAIL PROTECTED]> wrote: > On 2007-01-11, Frederic Rentsch <[EMAIL PROTECTED]> wrote: > > If I derive a class from another one because I need a few extra > > features, is there a way to promote the base class to the > > derived one without having to make copies of all attributes? > > > > class Derived (Base): > > def __init__ (self, base_object): > > # ( copy all attributes ) > > ... > > > > This looks expensive. Moreover __init__ () may not be available > > if it needs to to something else. > > > > Thanks for suggestions > > How does it make sense to cast a base to a derived in your > application? >
I can't figure out any circumstance when you'd need to do this in Python. Upcasting like this is something you do in statically typed languages. I suspect that the OP doesn't really believe dynamic casting works and doesn't want to pass a derived class for some reason. -- http://mail.python.org/mailman/listinfo/python-list
