[Numpy-discussion] Type checking of arrays containing strings

Arnar Flatberg arnar.flatberg@gmail....
Fri Jul 18 05:38:29 CDT 2008


On Fri, Jul 18, 2008 at 11:40 AM, Stéfan van der Walt <stefan@sun.ac.za>
wrote:

> 2008/7/18 Arnar Flatberg <arnar.flatberg@gmail.com>:
> > I need to check if my array (a) is of type `string`. That is, I dont know
> > the number of characters beforehand, so I cant do a.dtype == '|S*' (* =
> > (max) number of characters)
> > Looking at my options,  I see either a.dtype.kind == 'S' or a.dtype.type
> ==
> > np.string_, might be ok. Are these any of the preffered ways, or is there
> > some other way?
>
> Maybe
>
> np.issubdtype(x.dtype, str)

Yes, silly of me. I didnt look at the documentation (source) and tried
np.issubdtype(x, str) as my first try. That not working, I got lost. That
said, I think some other parameter names than arg1, arg2 would be nice for
an undocumented function .

Arnar
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