[Numpy-discussion] dtype: hashing and cmp

[Simon B. <si...@ar...>]

Is there a reason why dtype's are unhashable ? (ouch)

On another point, is there a canonical list of dtype's ?
I'd like to test the dtype of an array, and I always
end up with something like this:

if array.dtype == numpy.dtype('l'): ...

When I would prefer to write something like:

if array.dtype == numpy.Int32: ...

(i can never remember these char codes !)

Alternatively, should dtype's __cmp__ promote the other arg
to a dtype before the compare ?
I guess not, since that would break a lot of code: eg. dtype(None) 
is legal.

Simon.

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