Question

How to add The following timestamps month wise in python 2.4 i.e, all the timestamps occurring in month 3 should be added together.

For example: the result should be like on 2011-03 total timestamp is 1:00:45 and so on for other months..

2011-03-07  0:27:41
2011-03-06  0:13:41
2011-03-08  0:17:40
2011-03-04  0:55:40
2011-05-16  0:55:40
2011-05-18  0:55:40
2011-07-16  0:55:40
2011-07-17  0:55:40

Answer 1

How about this:

import datetime
import re
from collections import defaultdict
months = defaultdict(int)
# months = {}  # for Python 2.4
with open("test.txt") as timestamps:
    for line in timestamps:
        month = line[:7]
        time = re.search(r"(\d+):(\d+):(\d+)", line)
        if time:
             seconds = int(time.group(1))*3600 + \
                       int(time.group(2))*60 +   \
                       int(time.group(3))
             months[month] += seconds
             # if month in months:          # Python 2.4
             #     months[month] += seconds
             # else:
             #     months[month] = seconds
for month in sorted(months.keys()):
    print("Times for {}: {}".format(month, 
                                    datetime.timedelta(seconds=months[month])))

Output:

Times for 2011-03: 1:54:42
Times for 2011-05: 1:51:20
Times for 2011-07: 1:51:20