class_docstr: Stack class
class_docstr_tok: ["Stack","class"]
docstr: create a stack
docstr_tok: ["create","a","stack"]
code: def __init__(self, text=""):
      """
      create a stack
      """
      self.items = list(text)
  
label_desc: Use image node_id 1 to create a new Stack object  with example: obj = Stack(text)