[Numpy-discussion] 0d array value comparisons

Thomas J. Duck tom.duck@dal...
Fri Jul 25 12:42:05 CDT 2008


      There is some unexpected behaviour (to me) when 0-dimensional  
arrays are compared with values.  For example:

  >>> numpy.array([0]).squeeze() == 0

 >>> numpy.array([None]).squeeze() == None

 >>> numpy.array(['a']).squeeze() == 'a'
array(True, dtype=bool)

Note that each test follows the same pattern, although the dtype for  
each squeezed array is different.  The first case result is what I  
expected, and the second case result appears wrong.  The return type  
for the third case is inconsistent with those before, but is at least  

      Are these the intended results?



Thomas J. Duck <tom.duck@dal.ca>

Associate Professor,
Department of Physics and Atmospheric Science, Dalhousie University,
Halifax, Nova Scotia, Canada, B3H 3J5.
Tel: (902)494-1456 | Fax: (902)494-5191 | Lab: (902)494-3813
Web: http://aolab.phys.dal.ca/

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