[Python-ideas] x=(yield from) confusion [was:Yet another alternative name for yield-from]

Greg Ewing greg.ewing at canterbury.ac.nz
Fri Apr 10 12:42:57 CEST 2009

Nick Coghlan wrote:

>>>>class Tricky(object):
> ...   def __iter__(self):
> ...     return self
> ...   def next1(self):
> ...     print "Next 1"
> ...     Tricky.next = Tricky.next2

I just tried using a class like that in a for loop, and
it doesn't work. The next() method has to be defined in
the class, because it's actually a special method (it
has a slot in the type object).

> Greg - looks to me like you're going to have to disallow caching the
> method lookup in the PEP.

Even if it would work, I don't want to preclude a
valuable optimization for the sake of such an obscure
use case.


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