parse.py

from datetime import datetime, timedelta
import re
import sys

file = open(sys.argv[1], 'r')
lines = file.readlines()
file.close()
dateformat = "%H:%M:%S"
prevtime = None
limit = 5
count = 0

print("parsing file with {:d} lines".format(len(lines)))

for i in range(0, len(lines)):
    time = re.search('[0-9][0-9]:[0-9][0-9]:[0-9][0-9]', lines[i])
    if time is None:
        continue

    time = time.group()
    time = datetime.strptime(time, dateformat)
    if prevtime is None:
        prevtime = time
        continue

    delta = time - prevtime
    if delta > timedelta(seconds=limit):
        print("Line #{:d} is logged after {:d} second: {:.0f}; ".format(i, limit, delta.total_seconds()) + lines[i].rstrip())
        count += 1

    prevtime = time

print("Total lines: {:d}".format(count))