[Numpy-discussion] 0/0 == 0?

Nathaniel Smith njs at pobox.com
Fri Oct 3 17:40:30 EDT 2014

On Fri, Oct 3, 2014 at 10:00 PM, Nathaniel Smith <njs at pobox.com> wrote:
> On Fri, Oct 3, 2014 at 5:13 AM, Charles R Harris
> <charlesr.harris at gmail.com> wrote:
>> On Thu, Oct 2, 2014 at 10:12 PM, Charles R Harris
>> <charlesr.harris at gmail.com> wrote:
>> Plus the g*dawful warning default to only warn once. That has always
>> bothered me, it just seems useless.
> I believe the idea is to only warn once per source location, i.e. if
> you write something like:
> z = np.zeros(())
> for foo in range(1000):
>    z / z
> z / z
> then you're supposed to get two warnings, for the two lines that
> contain divide-by-zero.
> And then there is an unfortunate interaction where all lines entered
> interactively are considered to be "the same line" for these purposes.
> I don't know why this happens. It's either a bug in ipython or in
> warnings. The weird thing is that ipython does give each line its own
> unique name (you can see 'filenames' like
> "<ipython-input-4-f23c7d6238bf>" in error tracebacks), but somehow the
> warning machinery doesn't pick up on this.

Here's the solution:


Nathaniel J. Smith
Postdoctoral researcher - Informatics - University of Edinburgh

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