[Leetcode][python]Path Sum/路径总和

class Solution(object):
    def hasPathSum(self, root, sum):
        """
        :type root: TreeNode
        :type sum: int
        :rtype: bool
        """
        if root == None:
            return False
        if root.left == None and root.right == None:
            return sum == root.val
        return self.hasPathSum(root.left, sum - root.val) or self.hasPathSum(root.right, sum - root.val)

self.hasPathSum(root.left, sum - root.val) or self.hasPathSum(root.right, sum - root.val)