Fwd: What's correct Python syntax?

[Igor Korot]

Sorry, that was sent to Mark directly.
Resending to the list.


---------- Forwarded message ----------
From: Igor Korot <ikorot01 at gmail.com>
Date: Tue, Jan 14, 2014 at 1:50 AM
Subject: Re: What's correct Python syntax?
To: Mark Lawrence <breamoreboy at yahoo.co.uk>


Hi, Mark,

On Tue, Jan 14, 2014 at 1:37 AM, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:
> On 14/01/2014 09:25, Igor Korot wrote:
>>
>> Hi, Rustom,
>>
>> On Tue, Jan 14, 2014 at 12:54 AM, Rustom Mody <rustompmody at gmail.com>
>> wrote:
>>>
>>> On Tuesday, January 14, 2014 2:16:56 PM UTC+5:30, Igor Korot 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.
>>>>
>>>>
>>>>
>>>> Is there a way to write something like this:
>>>>
>>>>
>>>> for data in f:
>>>>       (address,traffic) = string.split(data, ':')
>>>>       length = string.split(traffic, ',')[3]
>>>>
>>>>
>>>>
>>>> I'm interesred in only one element, so why should care about everything
>>>> else?
>>>> This can be easily done in Perl, but I'm stuck with Python now. ;-)
>>>
>>>
>>>
>>>>>> data="192.168.1.6 > 192.168.1.7: ICMP echo request, id 100, seq 200,
>>>>>> length 30"
>>>>>> (add,traff) = data.split(':')
>>>>>> add
>>>
>>> '192.168.1.6 > 192.168.1.7'
>>>>>>
>>>>>> traff
>>>
>>> ' ICMP echo request, id 100, seq 200, length 30'
>>>>>>
>>>>>> lenn = traff.split(',')
>>>>>> lenn = traff.split(',')[3]
>>>>>> lenn
>>>
>>> ' length 30'
>>
>>
>> What if I want field 2 and field 3? ("seq 200" and "length 30")
>>
>> Thank you.
>>
>>>>>>
>>> --
>>> https://mail.python.org/mailman/listinfo/python-list
>
>
> Please do a little work before asking such a trivial question, it's hardly
> difficult from the interactive interpreter, particularly when you already
> have an example to start with.

C:\Documents and Settings\Igor.FORDANWORK\Desktop\winpdb>python
Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> test = "I,like,my,chocolate"
>>> print test.split(',')[2,3]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not tuple

Like I said, I'm more used to Perl, but need to work with Python for a moment.

Thank you.

>
> --
> My fellow Pythonistas, ask not what our language can do for you, ask what
> you can do for our language.
>
> Mark Lawrence
>
> --
> https://mail.python.org/mailman/listinfo/python-list