from time import sleep
from multiprocessing import Process

g1 = 100
g2 = 200

# a function that blocks for a moment
def task():
    global g1
    global g2
    # block for a moment
    print(f'task: g1 = {g1}')
    sleep(5)
    g1 = 10000
    g2 = 20000
    print(f'task: g1 = {g1}, g2 = {g2}')


# create a process
p = Process(target=task)
# run the process
g1 = 1000
g2 = 2000
p.start()
# wait for the child process to finish
p.join()
print(f'main process: g1 = {g1}, g2 = {g2}')