How to share the value of Class in different python scripts?

Question

I have 3 python scripts:

main.py
sub.py
shared.py

In shared.py I define a Class called 'myClass':

myClass.x
myClass.y
myClass.z

In main.py use Popen to run sub.py:

Popen(['python', 'sub.py', myClass)]

This code don't work. How I can share myClass between process?