isSameTree.py

# Definition for a binary tree node.
class TreeNode(object):
     def __init__(self, x):
         self.val = x
         self.left = None
         self.right = None

class Solution(object):
    p = TreeNode(1)
    q = TreeNode(1)
    def isSameTree(self, p, q):
        """
        :type p: TreeNode
        :type q: TreeNode
        :rtype: bool
        """
        
        if (p==q):
            return True
        elif (not p and not q):
            return False
        
        return ((p.val == q.val) and isSameTree(p.left, q.left) and isSameTree(p.right, q.right))