I am using python 2.7 multiprocessing on windows 7:
import multiprocessing as mp from Queue import Queue from multiprocessing.managers import AutoProxy if __name__ == '__main__': manager = mp.Manager() myqueue = manager.Queue() print myqueue print type(myqueue) print isinstance(myqueue, Queue) print isinstance(myqueue, AutoProxy)
Output:
<Queue.Queue instance at 0x0000000002956B08> <class 'multiprocessing.managers.AutoProxy[Queue]'> False Traceback (most recent call last): File "C:/Users/User/TryHere.py", line 12, in <module> print isinstance(myqueue, AutoProxy) TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types
My question is: I would like to check if a variable is an instance of a multiprocessing queue, how should i go about checking?
I have referred to:
Check for instance of Python multiprocessing.Connection?
Accessing an attribute of a multiprocessing Proxy of a class
but they dont seem to address my issue. Thanks in advance!
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Answer
Question: I would like to check if a variable is an instance of a multiprocessing queue, how should i go about checking?
It’s a Proxy object, multiprocessing.managers.BaseProxy
does match:
from multiprocessing.managers import BaseProxy print(isinstance(myqueue, BaseProxy)) >>>True
Tested with Python: 3.4.2 and 2.7.9