Neilen Marais wrote:

Hi

I have a lot of code that uses numpy.sum with generator expressions:

import numpy as N

a = sum(i for i in xrange(3))

Of course the generator expressions are a little more involved than that. With numpy 0.9.8 this works as expected:

In [1]: import numpy as N In [2]: N.sum(i for i in range(3)) Out[2]: 3

but with 1.0b4 I get:

In [14]: N.sum(i for i in range(3)) Out[14]: <generator object at 0x2aaaae5e3248>

Is this the (new?) expected bahaviour, or is it a bug? I hope for the latter, since I use generators like this quite a bit...

It's a bug. It was introduced when adding an optional output argument to sum. In the sum function in fromnumeric.py there needs to be a return res statement in the check for a generator type. This is fixed in SVN. -Travis