[SciPy-dev] are arrays hashable?
Robert Kern
rkern at ucsd.edu
Tue Sep 20 11:15:52 EDT 2005
Alan G Isaac wrote:
> A function that used to work fine with SciPy arrays
> now chokes on the new scipy.base, claiming that
> the new arrays are an unhashable type.
>
> For illustration only:
>
>>>>from scipy.base import *
>>>>d = arange(11)
>>>>set(d)
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> TypeError: unhashable type
Arrays were never hashable, nor should they be since they are mutable.
The problem here is that set() isn't recognizing the array as an
iterable. With a slightly old CVS checkout, I get
In [10]: from scipy.base import *
In [11]: d = array(10)
In [12]: set(d)
---------------------------------------------------------------------------
exceptions.TypeError Traceback (most
recent call last)
/Users/kern/<console>
TypeError: iteration over non-sequence
In [13]: list(d)
---------------------------------------------------------------------------
exceptions.TypeError Traceback (most
recent call last)
/Users/kern/<console>
TypeError: iteration over non-sequence
--
Robert Kern
rkern at ucsd.edu
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
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