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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Building CPython
Date: Fri, 15 May 2015 17:05:16 -0400
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Xref: csiph.com comp.lang.python:90692

On 5/15/2015 4:59 AM, Marko Rauhamaa wrote:
> Must a method lookup necessarily involve object creation?

Where is matters, inside loops, method lookup can be avoided after doing 
it once.

for i in range(1000000): ob.meth(i)

versus

meth = ob.meth
for i in range(1000000): meth(i)

For working with a single stack:

a = []
apush = stack.append
apop = stack.pop
# Now apush(x), apop(x), and test with 'if a:' as desired.
Being able to do this was part of my rational for adding list.pop, about 
15 years ago.

-- 
Terry Jan Reedy