md5 shit in python

import os, md5;

for root, dirs, files in os.walk(os.path.abspath('')):
    for f in files:
        e = os.path.splitext(f)[1]
        if (e and e not in [".py",".db"]):
            h = md5.new(file(f,'rb').read()).hexdigest()
            n = h + e
            try:
                os.rename(f,n)
            except WindowsError:
                os.unlink(n)
                os.rename(f,n)
            print n + " " + f

How do I optimize this, I'm watching SICP right now

>>30
"It is not an instruction for changing the instruction pointer(IP/EIP)."
Linux kernel sources say otherwise.
http://oldlinux.org/lxr/http/source/kernel/sys_call.S?v=0.97
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