class_docstr: Base class for tracked locals and stack values
  
  VariableTracker instances are immutable and should be copied in
  order to change them.
class_docstr_tok: ["Base","class","for","tracked","locals","and","stack","values","VariableTracker","instances","are","immutable","and","should","be","copied","in","order","to","change","them","."]
code: def __repr__(self):
      return str(self)
  
imports: import collections
  from enum import Enum
  from typing import Any, Callable, Dict, List
  from ..None import variables
  from ..current_scope_id import current_scope_id
  from ..exc import unimplemented
  from ..source import AttrSource, Source
  from ..utils import identity, istype
label_desc: Use image node_id 5 for calling the VariableTracker obj's underlying member method code with example usage: obj.__repr__() and returns: str