Count the leap years since a couple was married.

annicount.py

import datetime, calendar
def find_leap_years_in_marriage(married_year):
    current_year = datetime.datetime.now().year
    return sum([1 for year in range(married_year, current_year) if calendar.isleap(year)])

if __name__ == '__main__':
    import sys
    leap_year_count = find_leap_years_in_marriage(int(sys.argv[1]))
    print 'You have {yc} leap years between when you were married and this anniversary.'.format(yc=leap_year_count)