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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.python
Subject: Re: dictionary size changed during iteration
References: <4DAED72B.2030400@shopzeus.com> <mailman.644.1303306435.9059.python-list@python.org> <roy-FE896A.09154622042011@news.panix.com>
Date: Sat, 07 May 2011 14:07:38 -0700
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:4920

Roy Smith <roy@panix.com> writes:
> changes = [ ]
> for key in d.iterkeys():
>   if is_bad(key):
>     changes.append(key)

    changes = list(k for k in d if is_bad(k))

is a little bit more direct.