Method isSymmetric

leetcode/101. Symmetric Tree.py:27–28

(self, root)

class Solution(object):
    # recursive
    def isSymmetric(self, root):
        return self._Symmetrical(root, root)
    def _Symmetrical(self, pRoot1, pRoot2):
        if pRoot1 and pRoot2:
            return pRoot1.val == pRoot2.val and self._Symmetrical(pRoot1.left, pRoot2.right) and self._Symmetrical(