import calendar

c = calendar.Calendar(firstweekday=calendar.SUNDAY)
year = 2021
month = 5
monthcal = c.monthdatescalendar(year, month)

try:
    third_friday = [day for week in monthcal for day in week if
                    day.weekday() == calendar.FRIDAY and day.month == month][2]
    print(third_friday)
except IndexError:
    print('No date found')