docstr: Returns a deepcopy of the expression tree.
docstr_tok: ["Returns","a","deepcopy","of","the","expression","tree","."]
code: def copy(self):
      """Returns a deepcopy of the expression tree."""
      return deepcopy(self)
  
imports: from abc import ABC, abstractmethod
  from collections import deque
  from copy import deepcopy
  from enum import IntEnum, auto, unique
  from typing import Any
label_desc: Use image node_id 13 for calling the AbstractExpression obj's underlying member method code with example usage: obj.copy() and returns: deepcopy