I thought I couldn't use setattr because I need the syntactic sugar sqrt(f) to work, but with your example code Numeric.sqrt(f) does in fact work correctly. I also need to do a bit more than may be possible with a simple lambda function, but I should be able to sort it out from here with the info you provided,
thanks again,
Gary
Rainer Mansfeld wrote: <snip>
Hi Gary,
you want your 'class factory' to change the methods of Numeric, so that they accept foo objects and return foo objects?
I've not the slightest idea how to achieve that.
If OTOH you want your foo class to have sqrt, arccos, etc. methods without defining them explicitly, I think you're looking for something like:
. import Numeric . . class Foo(object): . def __init__(self, value): . self.value = float(value) . for u in ['sqrt', 'cos', 'tan']: . setattr(self, u, lambda uf=getattr(Numeric, u): . uf(self.value + 42.0))
>>> f = Foo(7) >>> f.sqrt() 7.0
HTH Rainer
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