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yurivictor/get_friday_the_13s.py

Created April 13, 2012 22:57
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Get the number of Friday the 13ths in the past 100 years
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get_friday_the_13s.py
from datetime import *
from dateutil.rrule import *
from dateutil.relativedelta import *
def get_friday_the_13s():
YEARS_AGO = 100
TODAY = date.today()
YEARSAGO = TODAY + relativedelta(years=-YEARS_AGO)
fridays = list(rrule(DAILY, byweekday=(FR), dtstart=YEARSAGO, until=TODAY))
friday13s = list(rrule(DAILY, bymonthday=13, byweekday=(FR), dtstart=YEARSAGO, until=TODAY))
print 'In the past', YEARS_AGO, 'years, there have been', len(friday13s), 'Friday the 13ths.'
get_friday_the_13s()
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