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Sat Mar 3 04:19:09 CET 2007 · https://mail.python.org/pipermail/python-dev/2007-March/071481.html

$ python2.5 -m timeit -r 10 -n 1000000 -s 'class Foo(Exception): pass'
'try: raise Foo()' 'except: pass'
1000000 loops, best of 10: 2.49 usec per loop
$ python2.5 -m timeit -r 10 -n 1000000 -s 'class Foo(Exception):' -s '
 def __init__(self): pass' 'try: raise Foo()' 'except: pass'
1000000 loops, best of 10: 3.15 usec per loop
$ python2.5 -m timeit -r 10 -n 1000000 -s 'e = Exception()' 'try:
raise e' 'except: pass'
1000000 loops, best of 10: 2.03 usec per loop

We can get more than half of the benefit simply by using a default
__init__ rather than a python one.  If you need custom attributes but
they're predefined you could subclass the exception and have them as
class attributes.  Given that, is there really a need to pre-create
exceptions?

-- 
Adam Olsen, aka Rhamphoryncus

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[Python-Dev] Performance of pre-creating exceptions?