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Unlucky days solution in Clear category for Unlucky Days by 1-more
import datetime as dt
def checkio(year):
return sum(dt.date(year,m,13).weekday()==4 for m in range(1,13))
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert checkio(2015) == 3, "First - 2015"
assert checkio(1986) == 1, "Second - 1986"
March 12, 2018