human
Solve the following python programming problem given the following code:
def test_readers(self) : 
    target = [(0, 'A', 4, 6), (0, 'B', 2, 2), (0, 'C', 2, 2), (0, 'D', 1, 1), (0, 'E', 2, 2), (0, 'F', 1, 1), (1, '1', 3, 3), (1, '2', 3, 3), (1, '3', 2, 2), (1, '4', 2, 2), (1, '5', 2, 2), (1, '6', 2, 2), (2, 'Q', 2, 2), (2, 'R', 2, 2), (2, 'S', 2, 2), (2, 'X', 3, 3), (2, 'Y', 3, 3), (2, 'Z', 2, 2)] 
    stored = [{ 
        'f1' : 'A B C', 
}, { 
        'f1' : 'D E F', 
}, { 
        'f1' : 'A E C', 
}, { 
        'f1' : 'A A A', 
}, { 
        'f1' : 'A B', 
}] 
    def t(ix) : 
        tr = ix.term_reader () 
        self.assertEqual (list (tr), target) 
        dr = ix.doc_reader () 
        self.assertEqual (list (dr), stored) 
ix = self._one_segment_index () 
    self.assertEqual (len (self.segments), 1) 
    t (ix) 
    ix = self._multi_segment_index () 
    self.assertEqual (len (ix.segments), 3) 
    t (ix) 

    
    

    Fix the buggy line: self.assertEqual (len (self.segments), 1)
assistant
#Here is Python program to fix the buggy line: self.

self.assertEqual (len (ix.segments), 1)