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Groups > comp.lang.python > #63899
| From | Roy Smith <roy@panix.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: What's correct Python syntax? |
| Date | 2014-01-14 08:34 -0500 |
| Organization | PANIX Public Access Internet and UNIX, NYC |
| Message-ID | <roy-BA6517.08343114012014@news.panix.com> (permalink) |
| References | <mailman.5437.1389689219.18130.python-list@python.org> |
In article <mailman.5437.1389689219.18130.python-list@python.org>,
Igor Korot <ikorot01@gmail.com> wrote:
> Hi, ALL,
> I'm trying to process a file which has following lines:
>
> 192.168.1.6 > 192.168.1.7: ICMP echo request, id 100, seq 200, length 30
>
> (this is the text file out of tcpdump)
>
> Now I can esily split the line twice: once by ':' symbol to separate
> address and the protocol information and the second time by ',' to get
> information about the protocol.
> However, I don't need all the protocol info. All I'm interested in is
> the last field, which is length.
One possibility would be to forget about all the punctuation and just
use "length " (note the trailing space) as the split delimiter:
>>> line = '192.168.1.6 > 192.168.1.7: ICMP echo request, id 100, seq
200, length 30'
>>> line.split('length ')
'30'
this will only work if you're sure that "length " can never appear
anywhere else in the line. Another, perhaps more idiomatic, way would
be:
>>> _, length = line.split('length ')
>>> print length
30
What's happening here is split() is returning a list of two items, which
you then unpack into two variables, "_" and "length". It's common to
unpack unwanted fields into "_", as a hint (to the reader) that it's
unused.
Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread
What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 00:46 -0800
Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 00:54 -0800
Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 01:25 -0800
Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 01:37 -0800
Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:02 -0800
Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 02:16 -0800
Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:35 -0800
Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 02:51 -0800
Re: What's correct Python syntax? Roy Smith <roy@panix.com> - 2014-01-14 08:47 -0500
Re: What's correct Python syntax? Peter Otten <__peter__@web.de> - 2014-01-14 12:33 +0100
Re: What's correct Python syntax? Ned Batchelder <ned@nedbatchelder.com> - 2014-01-14 07:19 -0500
Re: What's correct Python syntax? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-01-14 08:58 -0500
Re: What's correct Python syntax? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-14 09:37 +0000
Fwd: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:03 -0800
Re: Fwd: What's correct Python syntax? Larry Hudson <orgnut@yahoo.com> - 2014-01-14 22:00 -0800
Re: What's correct Python syntax? Alister <alister.ware@ntlworld.com> - 2014-01-14 10:59 +0000
Re: What's correct Python syntax? Roy Smith <roy@panix.com> - 2014-01-14 08:34 -0500
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