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Date: Mon, 16 May 2011 17:39:11 +0100
From: MRAB <python@mrabarnett.plus.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:5525

On 16/05/2011 09:19, J wrote:
[snip]
> #!/usr/bin/python
>
> # Import RegEx module
> import re as regex
> # Log file to work on
> filetoread = open('/tmp/ pdu_log.log', "r")
> # File to write output to
> filetowrite =  file('/tmp/ pdu_log_clean.log', "w")
> # Perform filtering in the log file
> linetoread = filetoread.readlines()
> for line in linetoread:
>      filter0 = regex.sub(r"<G_","",line)
>      filter1 = regex.sub(r"\."," ",filter0)
> # Write new log file
>      filetowrite.write(filter1)
> filetowrite.close()
> # Read new log and get required fields from it
> filtered_log =  open('/tmp/ pdu_log_clean.log', "r")
> filtered_line = filtered_log.readlines()
> for line in filtered_line:
>      token = line.split(" ")
>      print token[0], token[1], token[5], token[13], token[20]
> print "Done"
>
[snip]

If you don't need the power of regex, it's faster to use string methods:

      filter0 = line.replace("<G_", "")
      filter1 = filter0.replace(".", " ")

Actually, seeing as how you're reading all the lines in one go anyway,
it's probably faster to do this instead:

     text = filetoread.read()
     text = text.replace("<G_", "")
     text = text.replace(".", " ")
     # Write new log file
     filetowrite.write(text)