Python: Something like `map` that works on threads

python multithreading parallel-processing map-function

Ram Rachum · Jul 25, 2010 · Viewed 16.5k times · Source

I was sure there was something like this in the standard library, but it seems I was wrong.

I have a bunch of urls that I want to urlopen in parallel. I want something like the builtin map function, except the work is done in parallel by a bunch of threads.

Is there a good module that does this?

Answer

There is a map method in multiprocessing.Pool. That does multiple processes.

And if multiple processes aren't your dish, you can use multiprocessing.dummy which uses threads.

import urllib
import multiprocessing.dummy

p = multiprocessing.dummy.Pool(5)
def f(post):
    return urllib.urlopen('http://stackoverflow.com/questions/%u' % post)

print p.map(f, range(3329361, 3329361 + 5))

Python: Something like `map` that works on threads

Answer

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