def maskColumn(self, column, mask_char="x"):

        for identifier, s in self.mMali.items():
            s.maskColumn(column, mask_char)
After the subsequent purchase, carry out two more buys/longs
dataset/ETHPy150Open CGATOxford/cgat/CGAT/Mali.py/Mali.maskColumn--crossover with--dataset/ETHPy150Open mhallsmoore/qstrader/position/position_test.py/TestRoundTripXOMPosition.test_calculate_round_trip