New submission from Simon Schuler:
Hello,
the following code doesn't work any longer in the new Python version 3.6.
import sys
import os
import subprocess
from multiprocessing import Pool, Value, Queue
import multiprocessing
import logging
import logging.handlers
import pickle
queue = multiprocessing.Manager().Queue(-1)
qh = logging.handlers.QueueHandler(queue)
pickle.dumps(qh)
It raises the following exception.
>>> TypeError: can't pickle _thread.RLock objects
Furthermore, also for customized logging handler classes it doesn't work
anymore.
class CustomHandler(logging.Handler):
def __init__(self, queue):
logging.Handler.__init__(self)
self.queue = queue
def emit(self, record):
try:
ei = record.exc_info
if ei:
dummy = self.format(record)
record.exc_info = None
except (KeyboardInterrupt, SystemExit):
raise
except:
self.handleError(record)
For a centralized logging facility in a multiprocess environment this is a big
problem. How can I handle this in the 3.6 version?
----------
messages: 284738
nosy: cxss
priority: normal
severity: normal
status: open
title: multiprocessing pickle error
versions: Python 3.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue29168>
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