# Display List Code Below:
def height(node):
	if (node == None):
		return 0
	return 1 + max(height(node.left), height(node.right))

def draw_node(output, link_above, node, level, p, link_char):
	if (node == None): 
 		return

	out = "["
	h = len(output)
	SP = " "

	if (p < 0):
		for s in output:
			if (s):
				s = " "*(-1*p) + s
    
		for s in link_above:
			if (s):
				s = " "*(-1*p) + s

	if level < h - 1:
		p = max(p, len(output[level + 1]))
	if (level > 0):
		p = max(p, len(output[level - 1]))
	p = max(p, len(output[level]))

	# Fill in to left
	if (node.left):
		leftData = SP + str(node.left.data) + SP
		draw_node(output, link_above, node.left, level + 1, p - len(leftData),'L')
		p = max(p, len(output[level + 1]))

	# Enter this data
	space = p - len(output[level])
	if (space > 0):
		output[level] += (' ' * space)
	node_data = SP + str(node.data) + SP
	output[level] += node_data

	# Add vertical link above
	space = p + len(SP) - len(link_above[level])
	if (space > 0):
		link_above[level] += (' ' * space)
	link_above[level] += link_char

	# Fill in to right
	if (node.right):
		draw_node(output, link_above, node.right, level + 1, len(output[level]),'R')
  
def display_tree(root):
	if (root == None):
		print("\tNone")
	h = height(root)
	output = []
	link_above = []
	for i in range(0,h): 
				output.append("")
				link_above.append("")
	draw_node(output, link_above, root, 0, 5, ' ')

	# Create link lines
	for i in range(h):
		for j in range(len(link_above[i])):
			if (link_above[i][j] != ' '):
				size = len(output[i - 1])
				if (size < j + 1):
					output[i - 1] += " " *(j + 1 - size)
				jj = j
				if (link_above[i][j] == 'L'):
					while (output[i - 1][jj] == ' '):
						jj += 1
					for k in range(j+1, jj-1):
						str1 = output[i - 1]
						list1 = list(str1)
						list1[k] = '_'
						output[i - 1] = ''.join(list1)
				elif(link_above[i][j] == 'R'):
					while (output[i - 1][jj] == ' '):
						jj-=1
					
					# k = j-1
					for k in range(j-1,jj+1,-1):
						temp = output[i - 1]
						list1 = list(temp)
						list1[k] = '_'
						output[i - 1] = ''.join(list1)
						k = k - 1
      
				str1 = link_above[i]
				list1 = list(str1)
				list1[j] = '|'
				link_above[i] = ''.join(list1)
					
	# Output
	for i in range(h):
		if (i):
			print("\t" , link_above[i])
		print("\t" , output[i])from TreeNode import *
from BinaryTree import *

def is_symmetric(root):
  queue = []
  queue.append(root.left)
  queue.append(root.right)

  while queue:
    left = queue.pop(0)
    right = queue.pop(0)

    if not left and not right:
      continue

    if not left or not right:
      return False

    if left.data != right.data:
      return False

    queue.append(left.left)
    queue.append(right.right)
    queue.append(left.right)
    queue.append(right.left)
  
  return True

# Driver code
def main():
  list_of_trees = [[TreeNode(1), TreeNode(2), TreeNode(2), TreeNode(3), TreeNode(4), TreeNode(4), TreeNode(3)],
  [TreeNode(18), TreeNode(21), TreeNode(21), TreeNode(47), TreeNode(20), TreeNode(21), TreeNode(47)],
  [TreeNode(25), TreeNode(4), TreeNode(67), TreeNode(2), TreeNode(3), TreeNode(3), TreeNode(2)],
  [TreeNode(1), TreeNode(2), TreeNode(2), TreeNode(3), None, None, TreeNode(3)],
  [TreeNode(1), TreeNode(2), TreeNode(2), None, TreeNode(3), TreeNode(3), None, TreeNode(4), TreeNode(5), TreeNode(5), TreeNode(4)]]

  input_trees = []
  for list_of_nodes in list_of_trees:
    tree = BinaryTree(list_of_nodes)
    input_trees.append(tree)
  
  i = 0
  for tree in input_trees:
    print(i+1,".\tInput Tree: ")
    display_tree(tree.root)
    print("\n\tResult:", is_symmetric(tree.root))
    print("-"*100)
    i+=1

if __name__ == '__main__':
    main()