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    <p>you should probably use regular expressions (also called regex) for that. Python has the re module which implements regex for python.</p> <p>See this as an example for the direction to look at: <a href="https://stackoverflow.com/questions/924127/python-regex-finding-multiple-matches-in-a-string">stackoverflow question finding multiple matches in a string</a>.</p> <p>Excerpt from the above: Logfile looks like:</p> <pre><code>[1242248375] SERVICE ALERT: myhostname.com;DNS: Recursive;CRITICAL </code></pre> <p>regex looks like:</p> <pre><code>regexp = re.compile(r'\[(\d+)\] SERVICE NOTIFICATION: (.+)') </code></pre> <p>which goes like this:</p> <ul> <li>r => raw string (alway recommended in regexes)</li> <li>\[ => matches the square bracket (which would be a special character otherwise)</li> <li>(\d+) => matches one ore more decimals \d = decimals and the + for 1 or more</li> <li>\] => followed by a closing square bracket </li> <li>SERVICE NOTIFICATION: => matches exactly these characters in sequence.</li> <li>(.+) => the . (dot) matches any character. And again the + means 1 or more </li> </ul> <p>Parantheses group the results.</p> <p>I made a short regex to start with your logfile format. Assuming your log from above is saved as log.txt. </p> <pre><code>import re regexp = re.compile(r'\[(\d{2}:\d{2}:\d{2}\.xxx\d{3})\][\s]+status[\s]+XYZ[\s]+ID:([0-9A-Zx]+)(.+)') f = open("log.txt", "r") for line in f.readlines(): print line m = re.match(regexp, line) #print m if m: print m.groups() </code></pre> <p>Regexes are not that easy looking or straightforward at first glance but if you search for regex or re AND python you will find helpful examples.</p> <p>Outpus this for me:</p> <pre><code>[13:40:19.xxx021] status XYZ ID:22P00935xxx -4 3.92 quote: 0.98/ 1.02 avg: -0.98 -0.16 ('13:40:19.xxx021', '22P00935xxx', ' -4 3.92 quote: 0.98/ 1.02 avg: -0.98 -0.16') [13:40:19.xxx024] status XYZ ID:22C0099xxx0 -2 26.4 quote: 11.60/ 11.85 avg: -13.20 2.70 ('13:40:19.xxx024', '22C0099xxx0', ' -2 26.4 quote: 11.60/ 11.85 avg: -13.20 2.70') [13:40:19.xxx027] status XYZ ID:22P0099xxx0 10 -17.18 quote: 1.86/ 1.90 avg: -1.72 1.42 ('13:40:19.xxx027', '22P0099xxx0', ' 10 -17.18 quote: 1.86/ 1.90 avg: -1.72 1.42') [13:40:19.xxx029] status XYZ ID:22C00995xxx 4 -42.5 quote: 8.20/ 8.30 avg: -10.62 -9.70 ('13:40:19.xxx029', '22C00995xxx', ' 4 -42.5 quote: 8.20/ 8.30 avg: -10.62 -9.70') [13:40:19.xxx031] status XYZ ID:22P00995xxx 2 9.66 quote: 3.30/ 3.40 avg: 4.83 16.26 ('13:40:19.xxx031', '22P00995xxx', ' 2 9.66 quote: 3.30/ 3.40 avg: 4.83 16.26') </code></pre> <p>Every second line is the output which is a list containing the matched groups.</p> <p>If you add this to the programm above:</p> <pre><code>print "ID is : ", m.groups()[1] </code></pre> <p>the output is:</p> <pre><code>[13:40:19.xxx021] status XYZ ID:22P00935xxx -4 3.92 quote: 0.98/ 1.02 avg: -0.98 -0.16 ID is : 22P00935xxx [13:40:19.xxx024] status XYZ ID:22C0099xxx0 -2 26.4 quote: 11.60/ 11.85 avg: -13.20 2.70 ID is : 22C0099xxx0 </code></pre> <p>Which matches your IDs you want to compare. Just play with it a little to get the result you really want.</p> <p><strong>Final example</strong> catches the ID, tests if its already there and adds the matched lines to a dictionary which has te IDs as its key:</p> <p>import re regexp = re.compile(r'[(\d{2}:\d{2}:\d{2}.xxx\d{3})][\s]+status[\s]+XYZ[\s]+ID:([0-9A-Zx]+)(.+)')</p> <pre><code>res = {} f = open("log.txt", "r") for line in f.readlines(): print line m = re.match(regexp, line) if m: print m.groups() id = m.groups()[1] if id in res: #print "added to existing ID" res[id].append([m.groups()[0], m.groups()[2]]) else: #print "new ID" res[id] = [m.groups()[0], m.groups()[2]] for id in res: print "ID: ", id print res[id] </code></pre> <p>Now you can play around and fine tune it to adapt it to your needs.</p>
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    1. COThank you. I tried this, however I got this error:
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    2. COTraceback (most recent call last): File "pnlcompregex.py", line 9, in ? print m.groups() AttributeError: 'NoneType' object has no attribute 'groups'
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    3. COcould this be because I am using Python 2.4?
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