I just found myself writing a method like this: def __getitem__(self, index): return self.data[(Ellipsis,) + index + (slice(),)] I would have liked to write it like this: self.data[..., index, :] because that would make it much easier to see what's being done. However, that won't work if index is itself a tuple of index elements. So I'd like to be able to do this: self.data[..., *index, :] -- Greg
On Tue, Sep 14, 2010 at 12:16 AM, Greg Ewing <greg.ewing@canterbury.ac.nz> wrote:
I just found myself writing a method like this:
def __getitem__(self, index): return self.data[(Ellipsis,) + index + (slice(),)]
I would have liked to write it like this:
self.data[..., index, :]
because that would make it much easier to see what's being done. However, that won't work if index is itself a tuple of index elements.
So I'd like to be able to do this:
self.data[..., *index, :]
If in indexes, why not when making other tuples? Mike
On Tue, Sep 14, 2010 at 9:54 AM, Mike Graham <mikegraham@gmail.com> wrote: ..
So I'd like to be able to do this:
self.data[..., *index, :]
If in indexes, why not when making other tuples?
I believe this and other unpacking generalizations are implemented in issue #2292: http://bugs.python.org/issue2292
Alexander Belopolsky wrote:
I believe this and other unpacking generalizations are implemented in issue #2292: http://bugs.python.org/issue2292
Yes, it appears so. Did a PEP for that ever materialise, or is everyone waiting until after the moratorium? -- Greg
On 9/14/2010 6:16 PM, Greg Ewing wrote:
Alexander Belopolsky wrote:
I believe this and other unpacking generalizations are implemented in issue #2292: http://bugs.python.org/issue2292
Yes, it appears so. Did a PEP for that ever materialise, or is everyone waiting until after the moratorium?
The only PEP I know of is the one for what has been done: http://www.python.org/dev/peps/pep-3132/ Extended Iterable Unpacking -- Terry Jan Reedy
Mike Graham wrote:
On Tue, Sep 14, 2010 at 12:16 AM, Greg Ewing <greg.ewing@canterbury.ac.nz> wrote:
self.data[..., *index, :]
If in indexes, why not when making other tuples?
It would be handy to be able to use it when making other tuples, yes. There's a particularly strong motivation for it in relation to indexes, though, because otherwise you not only end up having to use ugly (foo,) constructs, but you lose the ability to use any of the special indexing syntax. There's also a performance penalty if you end up having to look up 'slice' a bunch of times. -- Greg
participants (4)
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Alexander Belopolsky -
Greg Ewing -
Mike Graham -
Terry Reedy