Convert AWK regex to Python

[J]

Good morning all,
Wondering if you could please help me with the following query:-
I have just started learning Python last weekend after a colleague of mine showed me how to dramatically cut the time a Bash script takes to execute by re-writing it in Python.  I was amazed at how fast it ran.  I would now like to do the same thing with another script I have.

This other script reads a log file and using AWK it filters certain fields from the log and writes them to a new file.  See below the regex the script is executing.  I would like to re-write this regex in Python as my script is currently taking about 1 hour to execute on a log file with about 100,000 lines.  I would like to cut this time down as much as possible.

cat logs/pdu_log_fe.log | awk -F\- '{print $1,$NF}' | awk -F\. '{print $1,$NF}' | awk '{print $1,$4,$5}' | sort | uniq | while read service command status; do echo "Service: $service, Command: $command, Status: $status, Occurrences: `grep $service logs/pdu_log_fe.log | grep $command | grep $status | wc -l | awk '{ print $1 }'`" >> logs/pdu_log_fe_clean.log; done

This AWK command gets lines which look like this:-

2011-05-16 09:46:22,361 [Thread-4847133] PDU D <G_CC_SMS_SERVICE_51408_656.O_ CC_SMS_SERVICE_51408_656-ServerThread-VASPSessionThread-7ee35fb0-7e87-11e0-a2da-00238bce423b-TRX - 2011-05-16 09:46:22 - OUT - (submit_resp: (pdu: L: 53 ID: 80000004 Status: 0 SN: 25866) 98053090-7f90-11e0-a2da-00238bce423b (opt: ) ) >

And outputs lines like this:-

CC_SMS_SERVICE_51408 submit_resp: 0

I have tried writing the Python script myself but I am getting stuck writing the regex.  So far I have the following:-

#!/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"

Ugly I know but please bear in mind that I have just started learning Python two days ago.

I have been looking on this group and on the Internet for snippets of code that I could use but so far what I have found do not fit my needs or are too complicated (at least for me).

Any suggestion, advice you can give me on how to accomplish this task will be greatly appreciated.

On another note, can you also recommend a good no-nonsense book to learn Python?  I have read the book “A Byte of Python” by Swaroop C H (great introductory book!) and I am now reading “Dive into Python” by Mark Pilgrim.  I am looking for a book that explains things in simple terms and goes straight to the point (similar to how “A Byte of Python” was written)

Thanks in advance

Kind regards,

Junior