--- On Mon, 1/31/11, Wayne Werner <waynejwer...@gmail.com> wrote:
From: Wayne Werner <waynejwer...@gmail.com>
Subject: Re: [Tutor] search list with regex
To: "Elwin Estle" <chrysalis_reb...@yahoo.com>
Cc: tutor@python.org
Date: Monday, January 31, 2011, 10:20 AM
On Mon, Jan 31, 2011 at 7:07 AM, Elwin Estle <chrysalis_reb...@yahoo.com> wrote:
Tcl's list search command has the option to search for a list element that
matches a given regex. Is there something similar in python? If not, it seems
like it should be fairly trivial for me to write my own (just wondering if I
would be re-inventing the wheel).
matching_items = []for item in yourlist: result = re.search('[sS]ome
expression', item) # and of course s/search/match, if you're interested in
matching
if result:
matching_items.append(item)
Or you could go for more terse syntax via list comp:
matching_items = [item for item in yourlist if re.search('contains', item)]
Or if you want one at a time you could change [] for () and turn it into a
generator expression.
However, the list itself doesn't have any method for matching. Here are its
"public" methods:
appendcountextendindexinsertpopremovereversesort
HTH,Wayne
...here I am...dutifully bottom posting...
That's kinda what I figured, and the code you posted is pretty much what I had
in mind. The list I plan to use it with is pretty short, but varies in length
(am parsing a file full of Vcards).
One thing I notice, is that working with lists in Python is WAY faster than
doing it in Tcl. I have occasion to parse various text files and my standard
method is to slurp the whole thing up into a string variable, then break it up
into a list that I can then work on with various string or regex commands..
In Tcl, I've had it take minutes to do this process, but it takes just seconds
in Python.
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