Should array iterate over a set?
My expectation was that array would iterate over a set. This is incorrect:
array(set([1,2,3])) array(set([1, 2, 3]), dtype=object)
Is this the intended behaviour? A trivial work-around that does what I need is
array(list(set([1,2,3]))) array([1, 2, 3])
but I was wondering if this was by design or just a forgotten corner. (Maybe a vestige of the tuple special case for record arrays?) Michael. P.S. I just found that this was brought up by Ed Schofield on 2006-05-03, but there were no replies in that thread.
Michael McNeil Forbes wrote:
My expectation was that array would iterate over a set. This is incorrect:
array(set([1,2,3])) array(set([1, 2, 3]), dtype=object)
Is this the intended behaviour? A trivial work-around that does what I need is
array(list(set([1,2,3]))) array([1, 2, 3])
but I was wondering if this was by design or just a forgotten corner. (Maybe a vestige of the tuple special case for record arrays?)
We can recognize most sequences (i.e. for all i in range(len(x)), x[i] responds correctly), but we cannot easily deal with arbitrary iterables which are not sequences in the array() function. There are a lot of special cases and heuristics going on in array() as it is. Instead, we have a fromiter() function which will take an iterable and construct an array from it. It is limited to 1D arrays, but this is by far the most common use for constructing an array from an iterable. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
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Michael McNeil Forbes -
Robert Kern