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First solution in Clear category for Unlucky Days by Sim0000
from datetime import date
def checkio(year):
return sum(date(year, month, 13).weekday() == 4 for month in range(1, 13))
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert checkio(2015) == 3
assert checkio(1986) == 1
March 2, 2016
