[Python] Python Multiprocessing empty array

I am just trying multiprocessing in Python and I got a problem.

from multiprocessing import Process

w = 4;
arr = []

def func(num):
for i in range(num,50,w):
arr.append(i)

if __name__ == '__main__':
p1 = Process(target=func, args=(1,))
p1.start()
p2 = Process(target=func, args=(2,))
p2.start()
p1.join()
p2.join()


After running the code I get empty values for 'arr' array.

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