class_docstr: Raised when configuration should fallback to another backend
class_docstr_tok: ["Raised","when","configuration","should","fallback","to","another","backend"]
code: def __init__(self, backend):
      self.backend = backend
  
imports: import gc
  import os
  import sys
  import warnings
  import threading
  from abc import ABCMeta, abstractmethod
  from .format_stack import format_exc
  from .my_exceptions import WorkerInterrupt, TransportableException
  from ._multiprocessing_helpers import mp
  from ._compat import with_metaclass
label_desc: Use image node_id 1 to create a new FallbackToBackend object from inherited base classes: Exception with example: obj = FallbackToBackend(backend)