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Warnings killing my performance

Peter Otten
Posts: n/a
Kylotan wrote:

> Peter Otten <(E-Mail Removed)> wrote in message
> news:<c02ubl$qqt$07$(E-Mail Removed)>...
>> def disableWarnings():
>> def _theevilunwarner(*args):
>> pass
>> import warnings
>> warnings.warn = _theevilunwarner
>> warnings.warn_explicit = _theevilunwarner

> Heh, that's great. However, I don't think it really scales well to a
> full application, does it?

Well, you could disable warnings in critical parts only, but that wouldn't
play well with threads. Enter the not so evil unwarner:

def disableWarnings():
originalWarn = warnings.warn
disabled = sets.Set([

def _thenotsoevilunwarner(message, category=None, stacklevel=1):
if id(category) in disabled:
#print "DISMISS", message, category
#print "PROPAGATE", message, category
originalWarn(message, category, stacklevel)
warnings.warn = _thenotsoevilunwarner

It's still pretty fast (10.8 vs 27.1 usec on my machine), but the duplicate
test will slow down warnings that are actually propagated.

And if you are really ambitious, you could devise a patch to speed up warn()
in the library, maybe using a similar technique as shown above.


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