comefrom: <doocs>1145.Binary Tree Coloring Game_1.py
code: def count(root):
      if root is None:
          return 0
      return 1 + count(root.left) + count(root.right)
masked: def sample_funcname ( var_1 ) :
      if var_1 is None :
          return 0
      return 1 + var_0 ( var_1.left ) + var_0 ( var_1.right )
  