Possibly Pythonic Tail Call Optimization (TCO/TRE)
ned at nedbatchelder.com
Wed Jul 15 13:12:59 CEST 2015
On Wednesday, July 15, 2015 at 6:56:10 AM UTC-4, Marko Rauhamaa wrote:
> Ned Batchelder <ned at nedbatchelder.com>:
> > On Wednesday, July 15, 2015 at 2:44:55 AM UTC-4, Marko Rauhamaa wrote:
> >> The other problem for tail call elimination is the requirement that
> >> functions return None by default. Smooth tail call elimination would
> >> require that Python leave the default return value unspecified.
> > I don't understand this, can you explain more? Are you saying that the
> > Python specification shouldn't specify what x becomes?:
> > def who_knows():
> > pass
> > x = who_knows()
> Yes, that's what I'm saying. The implementation would be free to assign
> any value whatsoever to x.
I don't understand why that is helpful for TCE? Can you explain? How does
specifying None make "smooth TCE" difficult?
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