human
Solve the following python programming problem given the following code:
def _generate_marginal_results(table, data, values, rows, cols, aggfunc, grand_margin, margins_name = 'All') : 
    if (len (cols) > 0) : 
        table_pieces = [] 
        margin_keys = [] 
        def _all_key(key) : 
            return ((key, margins_name) + (('',) * (len (cols) - 1))) 
if (len (rows) > 0) : 
            margin = data [(rows + values)].groupby (rows).agg (aggfunc) 
            cat_axis = 1 
            for (key, piece) in table.groupby (level = 0, axis = cat_axis) : 
                all_key = _all_key (key) 
                piece = piece.copy () 
                try : 
                    piece [all_key] = margin [key] 
except TypeError : 
                    piece.set_axis (cat_axis, piece._get_axis (cat_axis)._to_safe_for_reshape ()) 
                    piece [all_key] = margin [key] 
table_pieces.append (piece) 
                margin_keys.append (all_key) 
else : 
            margin = grand_margin 
            cat_axis = 0 
            for (key, piece) in table.groupby (level = 0, axis = cat_axis) : 
                all_key = _all_key (key) 
                table_pieces.append (piece) 
                table_pieces.append (Series (margin [key], index = [all_key])) 
                margin_keys.append (all_key) 
result = concat (table_pieces, axis = cols) 
        if (len (rows) == 0) : 
            return result 
else : 
        result = table 
        margin_keys = table.columns 
if (len (cols) > 0) : 
        row_margin = data [(cols + values)].groupby (cols).agg (aggfunc) 
        row_margin = row_margin.stack () 
        new_order = ([len (cols)] + lrange (len (cols))) 
        row_margin.index = row_margin.index.reorder_levels (new_order) 
else : 
        row_margin = Series (np.nan, index = result.columns) 
return (result, margin_keys, row_margin) 

    
    

    Fix the buggy line: result = concat (table_pieces, axis = cols)
assistant
#Here is Python code to fix the buggy line: result = concat (table_pieces, axis = cols)
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result = concat (table_pieces, axis = cat_axis)