human
Can you provide a the Python code you requested given the following:
I am working on the file "03_BinaryTree_DivideConquer.ipynb".
The first task is:
Binary Tree Longest Consecutive Sequence
http://www.lintcode.com/en/problem/binary-tree-longest-consecutive-sequence/
Can you write Python code for it?
assistant
#Here is the Python code you requested.

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

class Solution:
    # @param {TreeNode} root the root of binary tree
    # @return {int} the length of the longest consecutive sequence path
    def longestConsecutive(self, root):
        # Write your code here
        start, longest = self.helper(root)
        return longest
        
    def helper(self, root):
        if root is None:
            return 0, 0
        
        left_start, left_longest = self.helper(root.left)
        right_start, right_longest = self.helper(root.right)
        
        if root.left and root.val+1 == root.left.val:
            if left_start:
                left_start += 1
            else:
                left_start = 2
            left_longest = max(left_start, left_longest)
        else:
            left_start = 0
        
        if root.right and root.val+1 == root.right.val:
            if right_start:
                right_start += 1
            else:
                right_start = 2
            right_longest = max(right_start, right_longest)
        else:
            right_start = 0
            
        return max(left_start, right_start), max(left_longest, right_longest, 1)
                

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

class Solution:
    # @param {TreeNode} root the root of binary tree
    # @return {int} the length of the longest consecutive sequence path
    longest = 0
    def longestConsecutive(self, root):
        # Write your code here
        self.helper(root)
        return self.longest
        
        
    def helper(self, root):
        if root is None:
            return 0
        
        left = self.helper(root.left)
        right = self.helper(root.right)
        sublongest = 1
        
        if root.left and root.val + 1 == root.left.val:
  ...