[Python-Dev] Faster Set.discard() method?

Barry Warsaw barry at python.org
Fri Mar 18 15:08:20 CET 2005

On Fri, 2005-03-18 at 01:19, Andrew McNamara wrote:

> No, exceptions are fast at the C level - all they do is set a flag. The
> expense of exceptions is saving a restoring python frames, I think,
> which doesn't happen in this case. So the current implementation is
> ideal for C code - clear and fast.

The other advantage for raising and catching exceptions entirely in C is
that the (class) exceptions are never instantiated.  Once you cross the
C-Python barrier you have to pay for that instantiation.


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