On 2013-06-14 21:03, Brett Cannon wrote:
On Fri, Jun 14, 2013 at 3:12 PM, Martin Schultz <[email protected]
<mailto:[email protected]>> wrote:
- add a `size` attribute to all objects (I wouldn't mind if this is None
in case you don't really know how to define the size of something, but it
would be good to have it, so that `anything.size` would never throw an error
This is what len() is for. I don't know why numpy doesn't define the __len__
method on their array types for that.
It does. It gives the size of the first axis, i.e. the one accessed by simple
indexing with an integer: some_array[i]. The `size` attribute givens the total
number of items in the possibly-multidimensional array. However, one of the
other axes can be 0-length, so the array will have no elements but the length
will be nonzero.
[~]
|4> np.empty([3,4,0])
array([], shape=(3, 4, 0), dtype=float64)
[~]
|5> np.empty([3,4,0])[1]
array([], shape=(4, 0), dtype=float64)
[~]
|6> len(np.empty([3,4,0]))
3
--
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
_______________________________________________
Python-Dev mailing list
[email protected]
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
