#
from multiprocessing import Process, Value, Array
#
def f(n, a):
    print(f)
    n.value = 3.1415927
    print(n.value)
    for i in range(len(a)):
        a[i] = -a[i]
#
if __name__ == '__main__':
    num = Value('d', 0.0)
    arr = Array('i', [0, 0, 0, 0, 0])
    print(num.value)
    print(arr[:])
#
    p = Process(target=f, args=(num, arr))
    print(p)
    p.start()
    print(p)
    p.join()
    print(p)
#
    print(num.value)
    print(arr[:])
#

 >>>
0.0
[1, 1, 1, 1, 1]
<Process(Process-1, initial)>
<Process(Process-1, started)>
<Process(Process-1, stopped)>
3.1415927
[-1, -1, -1, -1, -1]
>>>

 arr = Array('i', [0, 0, 0, 0, 0])