Object Oriented Class Seperation

[egtoney]

The telemetry.py file needs to be split into an object oriented layout where each class has it's own file. Be careful of cyclical imports.

[weiliansong]

So for this task I literally created four new .py files:

1. MotorController.py
2. Battery.py
3. MPPT.py
4. PlottingDataMonitor.py

Each of these files contains the corresponding class from telemetry.py.

I copied and pasted the import statements from telemetry.py into each of the new files since I'm not sure which ones are necessary for the operation of each.

Then in PlottingDataMonitor.py I imported the other three new .py files with syntax below:

from Battery import Battery
from Motor import Motor
from MPPT import MPPT

Apparently if I use the form from UserDict1 import UserDict2 the attribute UserDict1 is directly imported into PlottingDataMonitor's local namespace and referencing its module object UserDict2 in the program is not necessary.

Questions:

• Since attributes are imported directly into the local namespace of PlottingDataMonitor, does it mean that PlottingDataMonitor.py is able to retrieve and use any of the other three file's variables and functions as if they physically exists in PlottingDataMonitor.py in the first place? In another word, do I have to do the MotorController.setSpeed() business or instead I can just call it setSpeed()?
• PlottingDataMonitor.py so far handles most of the GUI side of things, but in each of the other three files, they all have functions that draw their own tables or graphs. Can different files draw on one window? If so, is it necessary for them to also import PlottingDataMonitor.py?