在python 3.6中使用多处理池创建对象

Question

我正在尝试使用多处理池来创建对象列表，下面是简约示例：

import multiprocessing as mp

class MyClass:
    Count = 0

    def __init__(self, num):
        self.num = num
        MyClass.Count += 1

def CreateObj(num):
    Obj = MyClass(num)
    return Obj

if __name__ == '__main__':
    #x = CreateObj(5)

    pool = mp.Pool()
    x = pool.map(CreateObj, [1, 2, 3])

    print(x)

但它所做的就是抛出看起来像这样的外观：

Exception in thread Thread-8:
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\ProgramData\Anaconda3\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\ProgramData\Anaconda3\lib\multiprocessing\pool.py", line 429, in _handle_results
    task = get()
  File "C:\ProgramData\Anaconda3\lib\multiprocessing\connection.py", line 251, in recv
    return _ForkingPickler.loads(buf.getbuffer())
AttributeError: Can't get attribute 'MyClass' on <module '__main__' from 'C:\\ProgramData\\Anaconda3\\lib\\site-packages\\spyder\\utils\\ipython\\start_kernel.py'>

我真的不知道该怎么做。我在这里缺少什么？