from multiprocessing import Process

class C(object):
    VAR = 'DEFAULT'


def print_c():
    print(f'C.VAR = {C.VAR}')

def main():
    print_c()
    C.VAR = 'CHANGED'
    print_c()

    p = Process(target=print_c, daemon=True)
    p.start()
    p.join()

if __name__ == "__main__":
  main()