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From: Peter Otten <__peter__@web.de>
Subject: Re: Opinion on best practice...
Date: Tue, 05 Feb 2013 11:35:19 +0100
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Xref: csiph.com comp.lang.python:38180

Ulrich Eckhardt wrote:

> separate variable but iterated over it directly. For large dirs, it
> could also be better to use os.path.walk(), because that doesn't first
> build a list and then iterate over the list but iterates over the single
> elements directly. This avoids the memory allocation overhead, although
> it is unlikely to make a difference in this case and a Premature
> Optimization(tm).

Not true. os.walk() uses os.listdir() internally.