Hello and MotorBridge.py lib...

# init stepper motor A
    def StepperMotorAInit(self):
        WriteByte(TB_1A_MODE, TB_SPM) #Stepper
        time.sleep(DelayTime)
        WriteHalfWord(TB_1A_DUTY, 1000)    # voltage
        time.sleep(DelayTime)

    # MoveSteps > 0 CW
    # MoveSteps < 0 CCW
    # StepDelayTime : delay time for every step. uint us
    def StepperMotorAMove(self, MoveSteps, StepDelayTime):
        if MoveSteps > 0:
            WriteByte(TB_1A_DIR, TB_CW)   #CW
        else:
            WriteByte(TB_1A_DIR, TB_CCW)   #CW
            MoveSteps = -MoveSteps
        time.sleep(DelayTime)
        WriteOneWord(TB_1A_SPM_SPEED, StepDelayTime)  # unit us
        time.sleep(DelayTime)
        WriteOneWord(TB_1A_SPM_STEP, MoveSteps)
        time.sleep(DelayTime)