human
Solve the following python programming problem given the following code:
def _interaction_matrix(user, interaction = None, default = 0, missing = None) : 
    generating_fn = partial (_count_interaction, interaction = interaction) 
    neighbors = matrix_index (user) 
    def make_direction(direction) : 
        rows = [] 
        for u in neighbors : 
            correspondent = user.network.get (u, user) 
            if (correspondent is None) : 
                row = [(missing if (v != u) else 0) for v in neighbors] 
else : 
                cur_out = generating_fn (correspondent, direction = direction) 
                row = [cur_out.get (v, default) for v in neighbors] 
rows.append (row) 
return rows 
m1 = make_direction ('out') 
    m2 = make_direction ('in') 
    m = [[(m1 [i] [j] if (m1 [i] [j] is not None) else m2 [j] [i]) for j in range (len (neighbors))] for i in range (len (j))] 
    return m 

    
    

    Fix the buggy line: m = [[(m1 [i] [j] if (m1 [i] [j] is not None) else m2 [j] [i]) for j in range (len (neighbors))] for i in range (len (j))]
assistant
#Here is Python code to fix the buggy line: m = [[(m1 [i] [j] if (m1 [i] [j] is not None) else m2 [j] [i]) for j in range (len (neighbors))] for i in range (len (j))]
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m = [[(m1 [i] [j] if (m1 [i] [j] is not None) else m2 [j] [i]) for j in range (len (neighbors))] for i in range (len (neighbors))]