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From: Peter Otten <__peter__@web.de>
Subject: Re: Lists inside dictionary and how to look for particular value
Date: Mon, 27 Jan 2014 09:54:49 +0100
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Xref: csiph.com comp.lang.python:64851

mick verdu wrote:

> ThanK you. It solved my problem.
> Can someone tell me how can i print particular value inside list of key.
> 
> I know how to print J['PC2'][1] means will print IP. but I want the user
> to input some element and I will print element just before that element.
> 
> e.g. if user inputs 192.168.0.2, program will print 02:02:02:02:02:02.
> If user inputs 192.168.0.1 I will print 01:01:01:01:01:01.

IP_INDEX = 1
MAC_INDEX = 0

record = J["PC2"]

def is_ip(s):
    return "." in s

def is_mac(s):
    return ":" in s

s = raw_input("Enter MAC or IP: "
if is_mac(s):
    print record[IP_INDEX]
elif is_ip(s):
    print record[MAC_INDEX]
else:
    print "not a MAC or IP"

You can of course replace the is_ip() and is_mac() implementation with 
better ones.