Claudiu Popa added the comment:
This seems indeed like a weaker version of ThreadPoolExecutor. Here's how your
example looks with it, not very different and still easy to understand and
grasp:
from concurrent.futures import ThreadPoolExecutor
from urllib.request import urlretrieve
with ThreadPoolExecutor(max_workers=3) as executor:
url = 'http://www.{site}.org/'
for site in ('perl', 'python', 'jython', 'pypy'):
future = executor.submit(urlretrieve, url.format(site=site), site)
3 lines without imports and the initialisation of the pool.
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nosy: +Claudiu.Popa
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<http://bugs.python.org/issue22013>
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