On Thu, Sep 16, 2010 at 12:59:08PM -0600, Vince Spicer wrote: > On Thu, Sep 16, 2010 at 12:49 PM, Vince Spicer <vi...@vinces.ca> wrote:
> > On Thu, Sep 16, 2010 at 12:27 PM, Michael Powe <mich...@trollope.org>wrote: > >> I have two lists. > >> alist = ['label', 'guid'] > >> > >> blist = ['column0label', 'column1label', 'dimension0guid', > >> 'description', 'columnid'] > >> I want to iterate over blist and extract the items that match my > >> substrings in alist; alternatively, throw out the items that aren't in > >> alist (but, I've had bad experiences removing items from lists "in > >> place," so I tend toward the "copy" motif.) > On major speed up is to make a simple filter that returns as soon as > a match is found instead of completing the loop every element in > alist > def filter_(x, against): > for a in against: > if a in x: > return True > return False Hello, Totally awesome. I actually have a dictionary, with the key being an ini file header and the value being one of these lists of ini settings. With your method, I am able to loop through the dictionary, and expunge the unwanted settings. I knew there had to be a way to take advantage of the fact that the 'i in s' object test acts like a substring test for strings. Thanks. mp -- Michael Powe mich...@trollope.org Naugatuck CT USA 'Unless we approve your idea, it will not be permitted, it will not be allowed.' -- Hilary Rosen, President, RIAA
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