Gary Ruben wrote:
OK, I've managed to get this to work with Rainer's method, but I
realised it is not the best way to do it, since the methods are being
added by the constructor, i.e. they are instance methods. This means
that every time a foo object is created, a whole lot of code is being
run. It would be better to do the same thing with class 'static'
methods, if this is possible, so that the methods are created just once.
Is this possible?
Here is a solution using a metaclass:
import Numeric
class MetaFoo(type):
def __init__(cls, name, bases, d):
super(MetaFoo, cls).__init__(cls, name, bases, d)
for u in ['sqrt', 'cos', 'tan']:
setattr(cls, u, lambda self, uf=getattr(Numeric, u): uf(self.value
+ 42.0))
class Foo(object):
__metaclass__ = MetaFoo
def __init__(self, value):
self.value = float(value)
f = Foo(7)
print f.sqrt()
Kent
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