python - multiprocessing map raises exception -


this question has answer here:

i have simple example of map using multiprocessing. can't make run correctly.

import multiprocessing  p = multiprocessing.pool()  rere = range(50) print p.map(lambda x: x+1, rere)

it print exception:

exception in thread thread-3: traceback (most recent call last):   file "/usr/lib/python2.7/threading.py", line 808, in __bootstrap_inner     self.run()   file "/usr/lib/python2.7/threading.py", line 761, in run     self.__target(*self.__args, **self.__kwargs)   file "/usr/lib/python2.7/multiprocessing/pool.py", line 342, in _handle_tasks     put(task) picklingerror: can't pickle <type 'function'>: attribute lookup __builtin__.function failed

and unable terminate ctrl+c.

how should fix example make work?

ok research strange world of multiprocessing...

the way trying it, not enough. heres how managed pull off.

import multiprocessing mp import time  def thegenerator():     number in xrange(10):         yield number  def processnumber(x):     return x*2  def multiprocessthings():     pool = mp.pool()     gen = thegenerator()     result = pool.map(processnumber, gen)     print result  if __name__ == "__main__":     multiprocessthings()     time.sleep(10)

save wherever, , double click on it.

[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

also apparently type of stuff not work in interpreter reason.


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