text: """Implement multiprocessing `set` proxy."""
  from multiprocessing.managers import MakeProxyType
  from multiprocessing import Process, Pipe
  import traceback
  
  
  BaseSetProxy = MakeProxyType('BaseSetProxy', (
      '__and__', '__contains__', '__iand__', '__ior__', '__isub__', '__ixor__',
      '__len__', '__or__', '__rand__', '__ror__', '__rsub__', '__rxor__',
      '__sub__', '__xor__', 'add', 'clear', 'copy', 'difference',
      'difference_update', 'discard', 'intersection', 'intersection_update',
      'isdisjoint', 'issubset', 'issuperset', 'pop', 'remove',
      'symmetric_difference', 'symmetric_difference_update', 'union', 'update')
  )
  
  
  class SetProxy(BaseSetProxy):  # noqa: D101
      """Using sets with the multiprocessing module.
  
      reference: https://stackoverflow.com/a/16415356
      """
  
      def __iter__(self):  # noqa: D105
          _set = self.copy()
          while len(_set) > 0:
              yield _set.pop()
  
      def __iand__(self, value):  # noqa: D105
          self._callmethod('__iand__', (value,))
          return self
  
      def __ior__(self, value):  # noqa: D105
          self._callmethod('__ior__', (value,))
          return self
  
      def __isub__(self, value):  # noqa: D105
          self._callmethod('__isub__', (value,))
          return self
  
      def __ixor__(self, value):  # noqa: D105
          self._callmethod('__ixor__', (value,))
          return self
  
  
  class PatchedProcess(Process):
      """Add feature: handling Child Errors in Parent.
  
      reference: https://stackoverflow.com/a/33599967/1105489
      """
  
      def __init__(self, *args, **kwargs):  # noqa: D107
          super().__init__(*args, **kwargs)
          self._pconn, self._cconn = Pipe()
          self._exception = None
  
      def run(self):  # noqa: D102
          try:
              Process.run(self)
              self._cconn.send(None)
          except Exception as e:
              tb = traceback.format_exc()
              self._cconn.send((e, tb))
  
      @property
      def exception(self):  # noqa: D102
          if self._pconn.poll():
              self._exception = self._pconn.recv()
          return self._exception
  