[Numpy-discussion] RFC: out of range slice indexes
Mon Jan 14 14:03:51 CST 2008
On Jan 14, 2008 12:37 PM, Neal Becker <firstname.lastname@example.org> wrote:
> I've never liked that python silently ignores slices with out of range
> indexes. I believe this is a source of bugs (it has been for me). It
> completely counter to the python philosophy.
> I vote to ban them from numpy.
> >>> from numpy import array
> >>> x = array (xrange (10))
> >>> x
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> IndexError: index out of bounds
> >>> x[:12] = 2
> >>> x
> array([2, 2, 2, 2, 2, 2, 2, 2, 2, 2])
> >>> len (x)
> Silently ignoring the error x[:12] is a bad idea, IMO. If it meant to
> _extend_ x to have lenght 12, at least _that_ would be reasonable (but I'm
> not advocating that position).
> I believe that out of bounds indexes should always throw IndexError. We
> can't change that in Python now, but maybe we can in numpy.
-1. Regardless of the possible merit of this on it's face, I think this is
an area we should maintain compatibility with Python sequences. Not to
mention that it would likely break a bunch of code, including my own.
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