>>> from multiprocessing import Process
>>> def a(b):
...     b += 1
...
>>> process = Process(target=a, args=[aaa])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'aaa' is not defined
>>> aaa = 0
>>> process = Process(target=a, args=[aaa])
>>> process.start()
>>> aaa
0