human
Product of nodes at k | Function to find product of digits of elements at k - th level.
Initialize result.
increasing level number.
decreasing level number.
check if current level is the desired level or not.
required product.
Driver program"
How can the above be solved in Python?

What is a code to product of nodes at k and the other steps required?
assistant
#Here is code to product of nodes at k and the other steps required.
 def productAtKthLevel ( tree , k ) :
	level = - 1
	product = 1
	n = len ( tree )
	for i in range ( 0 , n ) :
		if ( tree [ i ] == ' ( ' ) :
			level += 1
		elif ( tree [ i ] == ' ) ' ) :
			level -= 1
		else :
			if ( level == k ) :
				product *= ( int ( tree [ i ] ) - int ( '0' ) )
	return product
tree = " ( 0(5(6 ( ) ( ) ) ( 4 ( ) (9 ( ) ( ) ) ) ) ( 7(1 ( ) ( ) ) ( 3 ( ) ( ) ) ) ) "
k = 2
print ( productAtKthLevel ( tree , k ) )