# your code goes here
from datetime import date, timedelta

def getLastWed(d):
	if d.isoweekday() >= 3:
		delta = d.isoweekday() - 3
	else:
		delta = d.isoweekday() + 7 - 3
	return d - timedelta(days=delta)
	
def getLast3WedInMonth(d):
	weeknum = d.isocalendar()[1]
	startWeeknum = date(d.year, d.month, 1).isocalendar()[1]
	if d.isoweekday() >= 3:
		thisWed = getLastWed(d)
		lastWed = getLastWed(thisWed - timedelta(days=1))
		last2Wed = getLastWed(lastWed - timedelta(days=1))
	else:
		thisWed = getLastWed(d)
		lastWed = thisWed
		last2Wed = getLastWed(lastWed - timedelta(days=1))

	return list(filter(lambda x: x["weeknumber"] >= startWeeknum, 
	    [
			{"weeknumber": weeknum-2, 'date': last2Wed},
			{"weeknumber": weeknum-1, 'date': lastWed},
			{"weeknumber": weeknum, 'date': thisWed}
		]))
		
print(getLast3WedInMonth(date.today()))
print(getLast3WedInMonth(date(2019, 9, 11)))
print(getLast3WedInMonth(date(2019, 9, 10)))
print(getLast3WedInMonth(date(2019, 9, 4)))