Python pass parameters/variables between two files

It is hard to describe but I will try my best. What i want is similar to this scenario. in main.py file:

var = None
while true:
    var += 1
    time.sleep(1)

in my anotherpythonfile.py

I want to access the var, but in every 5 second or whenever i want and check the current value. is there any design pattern for it?or any method?