[Numpy-tickets] [NumPy] #290: Some inconsistency in 'i' typecode
NumPy
numpy-tickets at scipy.net
Sun Sep 24 03:20:33 CDT 2006
#290: Some inconsistency in 'i' typecode
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Reporter: faltet | Owner: somebody
Type: defect | Status: reopened
Priority: normal | Milestone:
Component: Other | Version:
Severity: normal | Resolution:
Keywords: |
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Changes (by faltet):
* status: closed => reopened
* resolution: invalid =>
Comment:
Ok. I think I understand. My problem is that I'm trying to use the data-
type as a key in a dictionary and I can't make it work correctly:
{{{
>>> {numpy.dtype(numpy.int32): 'found'}[numpy.dtype(numpy.int32)]
'found'
>>> {numpy.dtype(numpy.int32): 'found'}[numpy.dtype(numpy.int_)]
'found'
>>> {numpy.dtype(numpy.int32): 'found'}[numpy.dtype(numpy.intc)]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
KeyError: dtype('<i4')
}}}
the ultimate problem for this is that these data-types have different
hashes:
{{{
>>> hash(numpy.dtype(numpy.int32))
-1213677440
>>> hash(numpy.dtype(numpy.int_))
-1213677440
>>> hash(numpy.dtype(numpy.intc))
-1213677184
}}}
There would be any chance that data-types int32 and intc would return the
same hash? or should I find other workarounds for my code (i.e. don't
using dictionaries for what I'm trying to do)?
Thanks!
--
Ticket URL: <http://projects.scipy.org/scipy/numpy/ticket/290>
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