Moving from last position...

I think what you mean is that you want to persist the state between script executions.
There are several ways to do the kind of thing you want depending on what is the actual goal.

Sounds like an XY-problem ( xyproblem.info )

I'll outline one way to accomplish this.

DobotDriver has "GetCounters" and "SetCounters" functions. Those counters are also internally tracked by DobotSDK as "_baseSteps", "_rearSteps" and "_frontSteps".
What you can do is persist those counters into a file at the end of your script and restore them in the other script. To restore you need to set "_baseSteps", "_rearSteps" and "_frontSteps" and call SetCounters on DobotDriver to set counters in Arduino

Arduino is reset every time a script opens the serial port - hardware limitation/feature and SetCounters sets internal state.

"_baseSteps", "_rearSteps" and "_frontSteps" are the actual counters that SDK uses as current pose and to compute the number of steps each motor has to do to get to the requested position.