Calculating average delta difference

japan.py

#!/usr/bin/python

from itertools import izip
from datetime import datetime

PROFILE_PICS = [
    '07 September 2015',
    '14 June 2015',
    '09 May 2015',
    '15 April 2015',
    '01 April 2015',
    '07 March 2015',
    '27 February 2015',
    '23 February 2015',
    '26 January 2015',
    '04 January 2015',
    '20 December 2014',
    '08 November 2014',
    '20 October 2014',
    '20 September 2014',
    '24 July 2014',
    '01 June 2014',
    '17 April 2014',
    '14 April 2014',
    '02 February 2014',
    '09 January 2014',
    '19 December 2013',
    '30 November 2013'
]

dates = [datetime.strptime(pic, '%d %B %Y').date() for pic in PROFILE_PICS]
deltas = map(lambda x: abs(x[0] - x[1]) , izip(dates, dates[1:]))
avg = sum(dt.days for dt in deltas) / len(deltas)

def main():
    print "Average days between profile changes:\t%d days" % avg
    print "Days since last profile change:\t\t%d days" % (abs(dates[0] - dates[1]).days)

if __name__ == '__main__':
    main()