old_contents: # encoding: utf-8
  
  __docformat__ = "restructuredtext en"
  
  #----------------------------------------------------------------------------
  #  Copyright (C) 2008  The IPython Development Team
  #
  #  Distributed under the terms of the BSD License.  The full license is in
  #  the file COPYING, distributed as part of this software.
  #----------------------------------------------------------------------------
  
  #----------------------------------------------------------------------------
  # Exports
  #----------------------------------------------------------------------------
  
  
  class DistArrayError(Exception):
      pass
  
  
  class MPIDistArrayError(DistArrayError):
      pass
  
  
  class InvalidCommSizeError(MPIDistArrayError):
      pass
  
  
  class InvalidRankError(MPIDistArrayError):
      pass
  
  
  class MPICommError(MPIDistArrayError):
      pass
new_contents: # encoding: utf-8
  
  __docformat__ = "restructuredtext en"
  
  #----------------------------------------------------------------------------
  #  Copyright (C) 2008  The IPython Development Team
  #
  #  Distributed under the terms of the BSD License.  The full license is in
  #  the file COPYING, distributed as part of this software.
  #----------------------------------------------------------------------------
  
  #----------------------------------------------------------------------------
  # Exports
  #----------------------------------------------------------------------------
  
  
  class DistArrayError(Exception):
      pass
  
  
  class MPIDistArrayError(DistArrayError):
      pass
  
  
  class ContextError(DistArrayError):
      pass
  
  
  class InvalidCommSizeError(MPIDistArrayError):
      pass
  
  
  class InvalidRankError(MPIDistArrayError):
      pass
  
  
  class MPICommError(MPIDistArrayError):
      pass
  
subject: Add ContextError class.