[Python-ideas] Revised^4 PEP on yield-from

Greg Ewing greg.ewing at canterbury.ac.nz
Wed Feb 25 11:39:45 CET 2009

Raymond Hettinger wrote:

> The hasattr() tests can be expensive for repeated throwers and senders.
> Any merit to caching the result of the test?

The expansion is a specification of the semantics, not
an implementation.

My current implementation does something like

   _m = getattr(_i, 'throw', None)
   if _m:

and a further optimisation would be to cache the
bound method.


More information about the Python-ideas mailing list