[Python-Dev] Re: PEP-317
Steven Taschuk
staschuk@telusplanet.net
Mon, 9 Jun 2003 12:51:47 -0600
Quoth Raymond Hettinger:
[...]
> That brings up the question of whether the warnings are a
> runtime or compile time event. Can you always determine
> at compile time whether raise Class is being used? If not,
> the performance penalty for the warnings module is something
> else to consider.
As the PEP says, the warning about using three arguments is issued
at compile-time, while the others are at run-time, in keeping with
when the corresponding future errors would occur.
The performance penalty of the warnings is a legitimate concern,
but I don't expect it to be a serious problem:
1. The compile-time warning is, well, issued at compile time,
which is not usually on a performance-critical path.
2. The run-time warnings are issued when raising an exception;
also not usually on a performance-critical path. (Except for
things like StopIteration. But the PEP does not propose any
change to the C API, so the built-in iterators won't be affected.)
--
Steven Taschuk staschuk@telusplanet.net
Receive them ignorant; dispatch them confused. (Weschler's Teaching Motto)