human
Solve the following python programming problem given the following code:
@ withActionContext 
def test_addBothCallsAddCallbacks(self) : 
    '
        L{DeferredContext.addBoth} passes its arguments on to
        L{DeferredContext.addCallbacks}.
        ' 
    result = Deferred () 
    context = DeferredContext (result) 
    called = [] 
    def addCallbacks(callback, errback, callbackArgs = None, callbackKeywords = None, errbackArgs = None, errbackKeywords = None) : 
        called.append ((callback, errback, callbackArgs, callbackKeywords, errbackArgs, errbackKeywords)) 
context.addCallbacks = addCallbacks 
    f = (lambda x, y, z : None) 
    context.addBoth (self, 2, z = 3) 
    self.assertEqual (called, [(f, f, (2,), { 
        'z' : 3, 
}, (2,), { 
        'z' : 3, 
})]) 

    
    

    Fix the buggy line: context.addBoth (self, 2, z = 3)
assistant
#Here is Python code to fix the buggy line: context.

context.addBoth (f, 2, z = 3)