New submission from Abhishek Manandhar:
I was looking to implement multiprocess pool. It worked fine with the numpy
function while with the user defined function it ran into error.
import numpy
>>> import multiprocessing
>>> P = multiprocessing.Pool(5)
>>> P.map(numpy.sqrt,range(50))
[0.0, 1.0, 1.4142135623730951, 1.7320508075688772, 2.0, 2.2360679774997898,
2.4494897427831779, 2.6457513110645907, 2.8284271247461903, 3.0,
3.1622776601683795, 3.3166247903553998, 3.4641016151377544, 3.6055512754639891,
3.7416573867739413, 3.872983346207417, 4.0, 4.1231056256176606,
4.2426406871192848, 4.358898943540674, 4.4721359549995796, 4.5825756949558398,
4.6904157598234297, 4.7958315233127191, 4.8989794855663558, 5.0,
5.0990195135927845, 5.196152422706632, 5.2915026221291814, 5.3851648071345037,
5.4772255750516612, 5.5677643628300215, 5.6568542494923806, 5.7445626465380286,
5.8309518948453007, 5.9160797830996161, 6.0, 6.0827625302982193,
6.164414002968976, 6.2449979983983983, 6.324555320336759, 6.4031242374328485,
6.4807406984078604, 6.5574385243020004, 6.6332495807107996, 6.7082039324993694,
6.7823299831252681, 6.8556546004010439, 6.9282032302755088, 7.0]
>>> def f(x):
return x*x
>>> P.map(f, range(50))
Exception in thread Thread-2:
Traceback (most recent call last):
File "C:\Python27\lib\threading.py", line 530, in __bootstrap_inner
self.run()
File "C:\Python27\lib\threading.py", line 483, in run
self.__target(*self.__args, **self.__kwargs)
File "C:\Python27\lib\multiprocessing\pool.py", line 285, in _handle_tasks
put(task)
TypeError: expected string or Unicode object, NoneType found
----------
components: Windows
messages: 243266
nosy: abheeman, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Multiprocessing Pool not working for userdefined function
type: crash
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue24202>
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