On Tuesday 27 March 2007 20:08:04 Bryce Hendrix wrote:
We have a class which is a subclass of ndarray which defines __array_finalize__ to add an attribute. The class looks something like this:
Ahah, we ran into this problem a few months ago: You should not initialize your "units" attribute in the __new__ method, as it's not thread-safe first, but more important as you will lose it if you try to get a view of your new object (because in that case, __new__ is not called). Instead, try something like that:
def __array_finalize__(self, obj): self.units = getattr(obj, 'units', yourdefaultunit)
where your defaultunit is the value you would use in __new__. True, yourdefaultunit may change, and even be lost if there's a break between __new__ and __array_finalize__, but that should work. Lemme know.
Note that things are always tricky w/ concatenate: when you concatenate your UnitArray, you should have a UnitArray, OK. But if you mix UnitArray and ndarray ? What should take precedence ?