LJ wrote:
> Thank you for the reply.
>
> So, as long as I access and modify the elements of, for example,
>
> A=array([[set([])]*4]*3)
>
>
> as (for example):
>
> a[0][1] = a[0][1] | set([1,2])
>
> or:
>
> a[0][1]=set([1,2])
>
> then I should have no problems?
As long as you set (i. e. replace) elements you're fine, but modifying means
trouble. You can prevent accidental modification by using immutable values
-- in your case frozenset:
>>> b = numpy.array([[frozenset()]*4]*3)
>>> b[0,0].update("123")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'frozenset' object has no attribute 'update'
Or you take the obvious approach and ensure that there are no shared values.
I don't know if there's a canonical form to do this in numpy, but
>>> a = numpy.array([[set()]*3]*4)
>>> a |= set()
works:
>>> assert len(set(map(id, a.flat))) == 3*4
--
https://mail.python.org/mailman/listinfo/python-list
