AssertionError

(1)p1 = multiprocessing.Process(test1)
p2 = multiprocessing.Process(target=test2) 
错误：    p1缺少target,应为(target=test1) 
Traceback (most recent call last):

  File "D:/untitled/多进程练习.py", line 11, in <module>
    p1 = multiprocessing.Process(test1)
  File "D:\python\lib\multiprocessing\process.py", line 74, in __init__
    assert group is None, 'group argument must be None for now'
AssertionError: group argument must be None for now