Thanks eryksun, that is a very clear example. Cheers pete On Wed, Aug 22, 2012 at 11:16 PM, eryksun <eryk...@gmail.com> wrote: > On Wed, Aug 22, 2012 at 3:06 AM, Peter Otten <__pete...@web.de> wrote: >> >> wanted = [line.strip("\n") for line in lines >> if "vn" not in line and "vt" not in line and line != "\n"] > > Here's an equivalent expression with the negation factored out: > > not ("vn" in line or "vt" in line or line == "\n") > > http://en.wikipedia.org/wiki/De_Morgan%27s_laws > > If you have a lot of tests all using the same operator (e.g. "in"), > you can use "any" (OR) or "all" (AND) with a generator expression: > > vals = ["vn", "vt", "vu", "vv", "vw", "vx", "vy", "vz"] > wanted = [line for line in lines if not any(v in line for v in vals)] > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor
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