[Numpy-discussion] bool value of dtype is False?

[Alexander Belopolsky]

On Fri, Feb 14, 2014 at 4:51 PM, Charles G. Waldman <charles at crunch.io>wrote:

> >>> d = numpy.dtype(int)
> >>> if d: print "OK"
> ... else: print "I'm surprised"
>
> I'm surprised
> _______________________________________________
>

I think this is an artifact of regular dtypes having "length" of zero:

>>> len(array(1.).dtype)
0

For record arrays dtypes you would get True:

>>> len(numpy.dtype([('x', int)]))
1
>>> bool(numpy.dtype([('x', int)]))
True
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