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Wed May 24 15:02:17 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-May/065150.html

Fredrik Lundh wrote:

>> Could it just be that instantiating instances of new-style classes is
>> slower than instantiating instances of old-style classes?  There's not
>> anything in what you've posted to suggest that exceptions are involved
>> directly.

for completeness, here's the corresponding results from 2.4:

python -mtimeit -s "class Exception(object): pass" "Exception()"
1000000 loops, best of 3: 0.278 usec per loop

python -mtimeit -s "class Exception: pass" "Exception()"
1000000 loops, best of 3: 0.387 usec per loop

python -mtimeit "Exception()"
1000000 loops, best of 3: 0.989 usec per loop

> python -mtimeit -s "class Exception(object): pass" "Exception()"
> 1000000 loops, best of 3: 0.284 usec per loop
> 
> python -mtimeit -s "class Exception: pass" "Exception()"
> 1000000 loops, best of 3: 0.388 usec per loop
> 
> python -mtimeit "Exception()"
> 1000000 loops, best of 3: 1.95 usec per loop

</F>

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[Python-Dev] 2.5a2 try/except slow-down: Convert to type?