python - Customized multiprocessing manager object has no attribute shutdown -

i wanted run example code (unmodified) https://docs.python.org/3/library/multiprocessing.html#customized-managers:

from multiprocessing.managers import basemanager  class mathsclass:     def add(self, x, y):         return x + y     def mul(self, x, y):         return x * y  class mymanager(basemanager):     pass  mymanager.register('maths', mathsclass)  if __name__ == '__main__':     mymanager() manager:         maths = manager.maths()         print(maths.add(4, 3))         # prints 7         print(maths.mul(7, 8))         # prints 56 

however, gives error:

traceback (most recent call last):   file "multithreadingbasexample.py", line 25, in <module>     print(maths.mul(7, 8))         # prints 56   file "c:\anaconda2\lib\multiprocessing\managers.py ", line 602, in __exit__     self.shutdown() attributeerror: 'mymanager' object has no attribute 'shutdown' 

whats wrong?

system: windows 7 64bit, python 2.7.13 |anaconda custom (64-bit)| (default, dec 19 2016, 13:29:36) [msc v.1500 64 bit (amd64)], multiprocessing 0.70a1