human
Solve the following python programming problem given the following code:
@ dec.skipif (True, 'Complex grads not enabled, see #178') 
def test_gradient(self) : 
    def fft_test1(a) : 
        return self.op (a, None, None) 
def fft_test2(a) : 
        return self.op (a, None, 0) 
def fft_test3(a) : 
        return self.op (a, 4, None) 
def fft_test4(a) : 
        return self.op (a, 4, 0) 
pts = [numpy.random.rand (5, 2, 4, 3), numpy.random.rand (2, 3, 4), numpy.random.rand (2, 5), numpy.random.rand (5)] 
    for fft_test in [fft_test1, self, fft_test3, fft_test4] : 
        for pt in pts : 
            theano.gradient.verify_grad (fft_test, [pt], n_tests = 1, rng = TestFourier.rng, out_type = 'complex64') 

    
    

    Fix the buggy line: for fft_test in [fft_test1, self, fft_test3, fft_test4] :
assistant
#Here is Python code to fix the buggy line: for fft_test in [fft_test1, self, fft_test3, fft_test4] :
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for fft_test in [fft_test1, def fft_test2(, fft_test3, fft_test4] :