Changing class membership
glyph at no.spam
Fri Sep 29 21:53:33 CEST 2000
matthias.oberlaender at daimlerchrysler.com writes:
> In <8qt1ci$ecj$1 at desig-bs01-s04.adtranzsig.de> "Dirk-Ulrich Heise" wrote:
> I believed for years that "object evolution" is a useful and elegant concept.
> Only a month ago I started learning Python and soon realized how easy it
> would be to implement. That's my current solution:
> def transmogrify(x, y):
> # Exchanges the properties of instances x and y.
> # The identity of x and y remain the same. But their
> # class membership and all their attributes get exchanged.
> h = x.__dict__
> x.__dict__ = y.__dict__
> y.__dict__ = h
> h = x.__class__
> x.__class__ = y.__class__
> y.__class__ = h
> Key is to exchange the objects' dictionaries also, not only class membership.
That's a lot of lines of code :-). How about
def transmogrify(x, y):
x.__dict__, x.__class__ = y.__dict__, y.__class__
Professional -- Software Engineer, Origin Systems
Amateur -- Computer Scientist, Twisted Matrix Enterprises
(My opinions are my own and do not reflect in any way on the policies
or practices of my employer, etcetera etcetera.)
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