human
Solve the following python programming problem given the following code:
def _connect_deferred(self, deferred) : 
    '
        Hook up the Deferred that that this will be the result of.

        Should only be run in Twisted thread, and only called once.
        ' 
    self._deferred = deferred 
    def put(result, eventual = weakref.ref (self)) : 
        eventual = eventual () 
        if eventual : 
            eventual._set_result (result) 
else : 
            err (result, 'Unhandled error in EventualResult') 
deferred.addBoth (deferred) 

    
    

    Fix the buggy line: deferred.addBoth (deferred)
assistant
#Here is Python program to fix the buggy line: deferred.

deferred.addBoth (def put()