ForAlex.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import sys
import time
from datetime import datetime

keyString = u'купить'
goodString = u'купюра'
timeThreshold = 90 # seconds timescale

def main():
	if (len(sys.argv) < 2):
		print('Usage: ./script log.name')
		return -1

	with open(sys.argv[1], 'r') as f:
		content = f.readlines()

	blockNum = 0
	lastDt = sys.maxint

	for lineString in reversed(content):
		strBlock = lineString.split(' ')
		
		# skip lines with less than 3 tokens
		if (len(strBlock) < 3):
			continue

		if (strBlock[-3].decode('utf-8') == goodString):
			break

		if (strBlock[-2].decode('utf-8') == keyString):
			dateStr = strBlock[0] + ' ' + strBlock[1]
			dt = int(time.mktime(datetime.strptime(dateStr, '%d.%m.%Y %H:%M:%S.%f').timetuple()))

			print(str(lineString))
			if lastDt != sys.maxint and (lastDt - dt) > timeThreshold:
				blockNum = blockNum + 1

			lastDt = dt
			#print(str(lastDt))

	print(str(blockNum))

if __name__ == "__main__":
    sys.exit(main())