[Numpy-discussion] Re: dtype: hashing and cmp

[Travis Oliphant]

Simon Burton wrote:
> On Sun, 28 May 2006 14:33:37 -0500
> Robert Kern <robert.kern at gmail.com> wrote:
>
>   
>>> if array.dtype == numpy.Int32: ...
>>>       
>> numpy.int32
>>     
>
>   
> No that doesn't work.
>
>   

Yeah, the "canonical" types (e.g. int32, float64, etc) are actually 
scalar objects.  The type objects themselves are dtype(int32).  I don't 
think they are currently listed anywhere in Python (except there is one 
for every canonical scalar object).  The difference between the scalar 
object and the data-type object did not become clear until December 
2005.  Previously the scalar object was used as the data-type  
(obviously there is still a relationship between them). 

-Travis




>>>> numpy.int32
>>>>         
> <type 'int32scalar'>
>   
>>>> numpy.int32 == numpy.dtype('l')
>>>>         
> False
>
>
> Simon.
>
>