Python code to balance brackets

balance.py

def doBalance(expression):
	stack = []
	if(len(expression)%2!=0 or expression[0]==")" or expression[-1] == "("):
		return False

	for ex in expression:
		if(ex == "("):
			stack.append(1)
		else:
			stack.pop()

	# print(stack)

	if(len(stack)==0):
		return True

if __name__ == '__main__':
	expression = "(()))("
	print(doBalance(expression))