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import inspect class Exitable(object): __slots__ = ("_at_exit_cbs") def _at_exit(self, cb): try: self._at_exit_cbs except AttributeError: self._at_exit_cbs = [] self._at_exit_cbs.append(cb) def __enter__(self): return self def __exit__(self, exc_type = None, exc_value = None, traceback = None): if self._exited: return for cb in reversed(self._at_exit_cbs): call_with_exc = True try: inspect.getcallargs(cb, exc_type, exc_value, traceback) except TypeError: call_with_exc = False if call_with_exc: cb(exc_type, exc_value, traceback) else: cb() self._at_exit_cbs = None @property def _exited(self): try: return self._at_exit_cbs is None except AttributeError: return True def ExitableWithAliases(*exit_methods): class CustomExitable(Exitable): pass def exit(self): self.__exit__() for exit_method_name in exit_methods: setattr(CustomExitable, exit_method_name, exit) return CustomExitable