[Numpy-discussion] type 'numpy.int64' unhashable

Gael Varoquaux gael.varoquaux@normalesup....
Fri Oct 30 06:23:52 CDT 2009


On Fri, Oct 30, 2009 at 08:21:16PM +0900, David Cournapeau wrote:
> On Fri, Oct 30, 2009 at 8:04 PM, Sebastian Haase <seb.haase@gmail.com> wrote:

> > I understand where this error comes from, however what I was trying to
> > do seems to "intuitive" that I would like to ask for suggestions:
> > "What should I do if the "number" 2636 becomes unhashable ?"

> In your example, that's the array which is unhashable, the numbers
> itself should be hashable. Arrays are mutable, so I don't think you
> can easily make them hashable. You could transform everything into
> tuple of tuple of... if you need to use set, though.

Use md5's of their .data attribute. This works quite well (you might want
to hash a pickled string of the dtype in addition).

Gaël


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