Yang, My guess is that you are running into a problem using multiprocessing with the interpreter. The documentation states that Pool may not work correctly in this case.
> Note: Functionality within this package requires that the __main__ method > be importable by the children. This is covered in *Programming > guidelines*<http://docs.python.org/library/multiprocessing.html#multiprocessing-programming>however > it is worth pointing out here. This means that some examples, such > as the multiprocessing.Pool examples will not work in the interactive > interpreter. > Hope this helps, Kyle On Tue, Mar 29, 2011 at 6:51 PM, Yang Zhang <yanghates...@gmail.com> wrote: > On Tue, Mar 29, 2011 at 6:44 PM, Yang Zhang <yanghates...@gmail.com> > wrote: > > I've tried both the multiprocessing included in the python2.6 Ubuntu > > package (__version__ says 0.70a1) and the latest from PyPI (2.6.2.1). > > In both cases I don't know how to use imap correctly - it causes the > > entire interpreter to stop responding to ctrl-C's. Any hints? Thanks > > in advance. > > > > $ python > > Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) > > [GCC 4.4.3] on linux2 > > Type "help", "copyright", "credits" or "license" for more information. > >>>> import multiprocessing as mp > >>>> mp.Pool(1).map(abs, range(3)) > > [0, 1, 2] > >>>> list(mp.Pool(1).imap(abs, range(3))) > > ^C^C^C^C^\Quit > > > > In case anyone jumps on this, this isn't an issue with running from the > console: > > $ cat /tmp/go3.py > import multiprocessing as mp > print mp.Pool(1).map(abs, range(3)) > print list(mp.Pool(1).imap(abs, range(3))) > > $ python /tmp/go3.py > [0, 1, 2] > ^C^C^C^C^C^\Quit > > (I've actually never seen the behavior described in the corresponding > Note at the top of the multiprocessing documentation.) > -- > http://mail.python.org/mailman/listinfo/python-list >
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