[Numpy-discussion] Getting number of *characters* in dtype='U' array

Robert Kern robert.kern@gmail....
Fri Sep 25 21:15:49 CDT 2009

On Fri, Sep 25, 2009 at 20:40, David Warde-Farley <dwf@cs.toronto.edu> wrote:
> On Fri, Sep 25, 2009 at 11:33:17AM -0400, Michael Droettboom wrote:
>> Is there a way to get the number of characters in a fixed-size 'U'
>> array?  I can, of course, parse dtype.str, or divide dtype.itemsize by
>> the size of a unicode character, but neither seems terribly elegant or
>> future proof.  Does numpy provide (to Python) a method for getting this
>> that I'm just missing?
>> In [7]: x = np.array(u'1234')
>> In [8]: x.dtype
>> Out[8]: dtype('<U4')
>> In [9]: x.dtype.str
>> Out[9]: '<U4'
>> In [10]: x.dtype.itemsize
>> Out[10]: 16
> I could be misleading you but I believe x.dtype.alignment is the divisor for itemsize that you're looking for?

Only by happenstance. It is not really related.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco

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