code: def parse(self):
      assert self.pos < len(self.tokens)
      token = self.tokens[self.pos]
      assert token != ")"
      self.pos += 1
  
      if token == "(":
          children = []
          while True:
              assert self.pos < len(self.tokens)
              if self.tokens[self.pos] == ")":
                  self.pos += 1
                  break
              else:
                  children.append(self.parse())
          return children
      else:
          return token
  
imports: import codecs
  import re
label_desc: Use image node_id 2 for calling the SexpParser obj's underlying member method code with example usage: obj.parse() and returns: children, token