[Numpy-discussion] Response to PEP suggestions

Paul Barrett barrett at stsci.edu
Fri Feb 18 11:52:20 CST 2005


Robert Kern wrote:

> Timo Korvola wrote:
>
>> Robert Kern <rkern at ucsd.edu> writes:
>>
>>> I'm not averse to len(x) returning 0 when given a rank-0 array. I see
>>> it as giving up one consistency (that scalar-like objects don't have
>>> lengths) for another (arrays having a common set of operations that
>>> one can expect regardless of rank or shape).
>>
>>
>>
>> That would be akin to making 0/0 return 0.  It is possible to create
>> arrays of length zero, e.g, by indexing with an empty slice, and these
>> should not be confused with rank zero arrays.
>
>
> Fair enough. I'm not averse to len(x) raising an exception when x is a 
> rank-0 array either.  :-)

Or it could return 'None', i.e. undefined.

-- 
Paul Barrett, PhD      Space Telescope Science Institute
Phone: 410-338-4475    ESS/Science Software Branch
FAX:   410-338-4767    Baltimore, MD 21218





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