[issue29517] "Can't pickle local object" when uses functools.partial with method and args...

[DAVID ALEJANDRO Pineda]

New submission from DAVID ALEJANDRO Pineda:

Hello.

I'm working in a real time data collector project. I'm using asyncio and multiprocessing (run_in_executor).
In python 3.5 worked fine but in python 3.6 not, gave to me this error:
 "Traceback (most recent call last):
  File "/usr/local/lib/python3.6/multiprocessing/queues.py", line 241, in _feed
    obj = _ForkingPickler.dumps(obj)
  File "/usr/local/lib/python3.6/multiprocessing/reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
AttributeError: Can't pickle local object 'WeakSet.__init__.<locals>._remove'
"

I tracked and the problem is when i run some method in run_in_executor with the functools.partial.

Before this version the system works fine.

The main file is local.py (to run with local administration using a socket)
And the engine is in engine.py

The project (in development):
https://gitlab.com/pineiden/collector

----------
components: asyncio
files: code_with_bug.png
messages: 287459
nosy: DAVID ALEJANDRO Pineda, gvanrossum, yselivanov
priority: normal
severity: normal
status: open
title: "Can't pickle local object" when uses functools.partial with method and args...
type: behavior
versions: Python 3.6
Added file: http://bugs.python.org/file46614/code_with_bug.png

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29517>
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