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Date: Wed, 30 Jul 2014 21:24:50 -0500
Subject: Re: speed up pandas calculation
From: Skip Montanaro <skip.montanaro@gmail.com>
To: Vincent Davis <vincent@vincentdavis.net>
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Xref: csiph.com comp.lang.python:75396

(Now that I'm on a real keyboard, more complete responses are a bit easier.)

Regarding the issue of missing columns from keep_col, you could create
sets of what you have and what you want, and toss the rest:

toss_these = list(set(df.columns) - set(keep_col))
del df[toss_these]

Or something to that effect.

Skip