[SciPy-dev] Don't understand these results
David Goldsmith
d_l_goldsmith at yahoo.com
Mon Aug 17 02:34:20 EDT 2009
--- On Sun, 8/16/09, Pierre GM <pgmdevlist at gmail.com> wrote:
> On Aug 17, 2009, at 1:35 AM, David Goldsmith wrote:
>
> >>>> c = np.array(['aAaAaA', ' aA
> ', 'abBABba']).view(np.chararray); c
> > chararray(['aAaAaA', ' aA', 'abBABba'],
> > dtype='|S7')
> >>>> c.count('aA', end=3)
> > array([3, 1, 0])
> >
> > ???
>
> Have you checked the code ?
I "take the 5th." ;-)
> The input of the method ('aA',start,end) are checked
> for consistency.
> However, a problem is that as soon any value is 0 or None
> or False,
> the following values are not checked and just discarded
> (that's line
> 171 in defchararray).
> When you call the `count` method, `start` defaults to None,
> meaning
> that the `end` parameter is never taken into account.
That would explain it.
> That's clearly a bug, actually 2 bugs:
> * `start` should default to 0 in that case (you need it in
> the `count`
> method of strings)
> * when one of the parameter is not None, it should be taken
> into
> account.
> >>> if not chk or (chk.dtype is object_ and
> chk.item() is None):
> should become
> >>> if (chk is None) of (chk.dtype is object_ and
> chk.item() is None):
>
> I don't have time to spend on fixing that right now, sorry.
NP, understood 100%
> Try to
> fill a ticket on the numpy trac.
Will do, presently.
> Many thanks for reporting.
You're welcome. (Never sure anymore whether odd behavior is a bug or a feature...)
DG
>
>
>
>
>
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