def recursionSerialize(self, root):
    series = ''
    if root == None:
      series += ',$'
    else:
      series += (',' + str(root.val))
      series += self.recursionSerialize(root.left)
      series += self.recursionSerialize(root.right)
    return series
  def Serialize(self, root):
    return self.recursionSerialize(root)[1:]

root = TreeNode(11)
root.left = TreeNode(2)
root.right = TreeNode(3)
series = Solution().Serialize(root)
print(series)
>11,2,$,$,3,$,$

print(series.split(','))
>['11', '2', '$', '$', '3', '$', '$']

  def getValue(self, s, sIndex):  #处理超过10的数字，将数字字符转变为数字
    val = 0
    while ord(s[sIndex]) <= ord('9') and ord(s[sIndex]) >= ord('0'):
      val = val * 10 + int(s[sIndex])
      sIndex += 1
    return val, sIndex - 1

  def Deserialize(self, s):
    if self.sIndex < len(s):
      if s[self.sIndex] == ',':
        self.sIndex += 1
      if s[self.sIndex] == '$':
        return None
      val, self.sIndex = self.getValue(s, self.sIndex)
      treeNode = TreeNode(val)
      self.sIndex += 1
      treeNode.left = self.Deserialize(s)
      self.sIndex += 1
      treeNode.right = self.Deserialize(s)
      return treeNode

class TreeNode:
  def __init__(self, x):
    self.val = x
    self.left = None
    self.right = None
class Solution:
  def __init__(self):
    self.sIndex = 0
  def recursionSerialize(self, root):
    series = ''
    if root == None:
      series += ',$'
    else:
      series += (',' + str(root.val))
      series += self.recursionSerialize(root.left)
      series += self.recursionSerialize(root.right)
    return series
  def Serialize(self, root):
    return self.recursionSerialize(root)[1:]
  def getValue(self, s, sIndex):  #处理超过10的数字，将数字字符转变为数字
    val = 0
    while ord(s[sIndex]) <= ord('9') and ord(s[sIndex]) >= ord('0'):
      val = val * 10 + int(s[sIndex])
      sIndex += 1
    return val, sIndex - 1
  def Deserialize(self, s):
    if self.sIndex < len(s):
      if s[self.sIndex] == ',':
        self.sIndex += 1
      if s[self.sIndex] == '$':
        return None
      val, self.sIndex = self.getValue(s, self.sIndex)
      treeNode = TreeNode(val)
      self.sIndex += 1
      treeNode.left = self.Deserialize(s)
      self.sIndex += 1
      treeNode.right = self.Deserialize(s)
      return treeNode