code: def __exit__(self, e, t, b):
      w = self.weakcontainer()
      if w is not None:
          s = w._iterating
          s.remove(self)
          if not s:
              w._commit_removals()
  
imports: from _weakref import ref
  from types import GenericAlias
label_desc: Use image node_id 3 for calling the _IterationGuard obj's underlying member method code with example usage: obj.__exit__(e, t, b) without return types