old_contents: import sys
  import traceback
  
  class BaseBackend(object):
      """Provides a base class that custom backends can subclass. Also provides basic
      traceback and message parsing.
      
      The ``__init__`` takes these keyword arguments:
      
          ``exp`` -- The exception generated by your failure.
          
          ``queue`` -- The queue in which the ``Job`` was enqueued when it failed.
          
          ``payload`` -- The payload that was passed to the ``Job``.
          
          ``worker`` -- The worker that was processing the ``Job`` when it failed.
      
      """
      def __init__(self, exp, queue, payload, worker=None):
          excc, _, tb = sys.exc_info()
          
          self._exception = excc
          self._traceback = traceback.format_exc()
          self._worker = worker
          self._queue = queue
          self._payload = payload
      
      
      def _parse_traceback(self, trace):
          """Return the given traceback string formatted for a notification."""
          return trace
      
      def _parse_message(self, exc):
          """Return a message for a notification from the given exception."""
          return '%s: %s' % (exc.__class__.__name__, str(exc))
      
new_contents: import sys
  import traceback
  
  class BaseBackend(object):
      """Provides a base class that custom backends can subclass. Also provides basic
      traceback and message parsing.
  
      The ``__init__`` takes these keyword arguments:
  
          ``exp`` -- The exception generated by your failure.
  
          ``queue`` -- The queue in which the ``Job`` was enqueued when it failed.
  
          ``payload`` -- The payload that was passed to the ``Job``.
  
          ``worker`` -- The worker that was processing the ``Job`` when it failed.
  
      """
      def __init__(self, exp, queue, payload, worker=None):
          excc, _, tb = sys.exc_info()
  
          self._exception = excc
          self._traceback = traceback.format_exc()
          self._worker = worker
          self._queue = queue
          self._payload = payload
  
  
      def _parse_traceback(self, trace):
          """Return the given traceback string formatted for a notification."""
          if not trace:
              return []
  
          return trace.split('\n')
  
      def _parse_message(self, exc):
          """Return a message for a notification from the given exception."""
          return '%s: %s' % (exc.__class__.__name__, str(exc))
  
  
subject: Save our backtraces in a compatible manner with resque.