class_docstr: Backwards compatibility alias for ExitStack
class_docstr_tok: ["Backwards","compatibility","alias","for","ExitStack"]
code: def register(self, callback, *args, **kwds):
      return self.callback(callback, *args, **kwds)
  
imports: import abc
  import sys
  import warnings
  from collections import deque
  from functools import wraps
label_desc: Use image node_id 3 for calling the ContextStack obj's underlying member method code with example usage: obj.register(callback) and returns: self