#NEWLINE# def addCallback( self , callback , * args , **kw ) : #NEWLINE# #INDENT# '\n        Add a success callback that will be run in the context of an eliot\n        action.\n\n        @return: C{self}\n        @rtype: L{DeferredContext}\n\n        @raises AlreadyFinished: L{DeferredContext.addActionFinish} has been\n            called. This indicates a programmer error.\n        ' #NEWLINE# return self . addCallbacks ( callback , _passthrough , callbackArgs = args , callbackKeywords = kw )