parameters: (self, msg, exception=None)
docstring: Creates an exception. The message is required, but the exception
          is optional.
docstring_summary: Creates an exception. The message is required, but the exception
          is optional.
docstring_tokens: Creates an exception . The message is required but the exception is optional .
function: def __init__(self, msg, exception=None):
          """Creates an exception. The message is required, but the exception
          is optional."""
          self._msg = msg
          self._exception = exception
          Exception.__init__(self, msg)
function_tokens: def __init__ ( self , msg , exception = None ) : self . _msg = msg self . _exception = exception Exception . __init__ ( self , msg )