Mailman 3 trouble with bool_ - NumPy-Discussion

6 May 2010


      What information exactly is `isnan` supposed to communicate?
Put another way, given that it raises NotImplemented for unknown types,
and that bool(NotImplemented) is True, is there a reason by it cannot
return a Python bool (which seems more useful)?
Thanks,
Alan Isaac
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np.isnan(np.nan)
True
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np.isnan(np.nan) is True
False
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type(np.isnan(np.nan))
<type 'numpy.bool_'>
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np.isnan('')
NotImplemented
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bool(_)
True
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if np.isnan(''): print "Uh oh"
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Uh oh