slice object unpickable

[exarkun at divmod.com]

On Tue, 02 Nov 2004 08:50:45 -0800, Josiah Carlson <jcarlson at uci.edu> wrote:
>
> sdementen at hotmail.com (Sebastien de Menten) wrote:
> > 
> > Hi,
> > 
> > I wonder why the slice object is not pickable via pickle or cPickle.
> > E.g.:
> 
> [snip slice pickling]
> 
> I don't know why clice pickling was disabled.
> 
> To get past it, why not just store the argument tuples that lead to
> slices?  (sli.start, sli.stop, sli.step)
> 

  Or use the copy_reg module to make them pickleable:

    def pickleSlice(slice):
        return unpickleSlice, (slice.start, slice.stop, slice.step)
    def unpickleSlice(start, stop, step):
        return slice(start, stop, step)
    copy_reg.pickle(slice, pickleSlice, unpickleSlice)

  Jp