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First solution in Clear category for Unlucky Days by rogos
from datetime import date
def checkio(year):
return sum(date(year, month, 13).isoweekday() == 5 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, "First - 2015"
assert checkio(1986) == 1, "Second - 1986"
Jan. 31, 2017
