Changed value of global variable is not used when function is called using multiprocessing in Python

Question

I am trying to make use of a global variable which is updated in func1() and then used in func2().

When I call func2() simply without multiprocessing, it utilizes the updated value of the global variable. However, when func2() is invoked using multiprocessing it uses the old value of the global variable.

How can I make use of the updated value of the global variable while multiprocessing?

Given below is the simple code to demonstrate this:

import multiprocessing

from multiprocessing import Process

myGlobal = None


def func1():
    global myGlobal
    myGlobal = 42


def func2():
    print(myGlobal)


if __name__ == "__main__":
    print("before update")
    func2()
    func1()
    print("after update")
    func2()

    print("Using multiprocessing")
    list_process = []
    for i in range(2):
        p = Process(target=func2)
        list_process.append(p)
        p.start()

    for i in range(2):
        list_process[i].join()

Output on console:

before update
None
after update
42
Using multiprocessing
None
None

Process finished with exit code 0