[Numpy-discussion] Re: Bytes Object and Metadata
oliphant at ee.byu.edu
Mon Mar 28 16:07:08 CST 2005
Scott Gilbert wrote:
> Suggested, but Optional if __array_itemsize__ is present.
> This attribute probably warrants some discussion...
> A struct module format string or one of the additional ones
> that needs to be added. Need to discuss "long double" and
> "Object". (Capital 'O' for Object, Captial 'D' for long double,
> Capital 'X' for bit?)
> If not present or the empty string '', indicates that the
> array elements can only be treated as blobs and the real
> data representation must be gotten from some other means.
> I think doubling the typecode as a convention to denote complex
> numbers makes some sense (for instance 'ff' is complex float).
> The struct module convention for denoting native, portable
> big endian, and portable little endian is concise and documented.
After more thought, I think here we need to also allow the "c-type"
independent way of describing an array (i.e. numarray-introduced 'c4'
for a complex-valued 4 byte itemsize array). So, pehaps
__array_ctypestr_ and __array_typestr__ should be two ways to get the
information (or overload the __array_typestr__ interface and reequire
consumers to accept either style).
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