Re: weblogsping.py error handling patch

Will wrote:
> Say you wrapped each cb_ function call in a callback list in 
> a try/except block.  First off, you're incurring a 
> performance decrease because try/except blocks are somewhat 
> expensive.

Really?

http://mail.python.org/pipermail/python-list/2001-May/045621.html

(It seems that it's not the try block that's slow, it's the throwing
 of the exception...)

My experiments confirm this hypothesis...

----------------------
import time

def timeIt( func ):
    start = time.time()
    for i in xrange( 1000 ):
        name = func()
    end = time.time()
    print '%s took %5.4f seconds'%(name, end - start)

def base():
    j = 0
    for i in xrange(10000):
        j = i+1
    return j

def tryblock():
    j = 0
    for i in xrange(10000):
        try:
            j = i + 1
        except TypeError, e:
            pass
    return j

timeIt( base )
timeIt( tryblock )
----------------------
(From the above code)
10000 took 1.2830 seconds
10000 took 1.7450 seconds
----------------------
(From another run, of 10 times as many tests...)
10000 took 9.5540 seconds
10000 took 13.6610 seconds
----------------------

So, ya know, for 10,000,000 try blocks, it took 0.462 seconds.
Not all that expensive, I don't think...

Later,
Blake.

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