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Clean-ups.

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Raymond Hettinger 2010-12-08 06:48:33 +00:00
parent b105519710
commit 83d8079ee7
1 changed files with 13 additions and 12 deletions
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Doc/whatsnew/3.2.rst
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@ -227,13 +227,13 @@ Both classes share a common interface with three methods:
:meth:`~concurrent.futures.Executor.submit` for scheduling a callable and :meth:`~concurrent.futures.Executor.submit` for scheduling a callable and
returning a :class:`~concurrent.futures.Future` object; returning a :class:`~concurrent.futures.Future` object;
:meth:`~concurrent.futures.Executor.map` for scheduling many asynchronous calls :meth:`~concurrent.futures.Executor.map` for scheduling many asynchronous calls
at time, and :meth:`~concurrent.futures.shutdown` for freeing resources. The at a time, and :meth:`~concurrent.futures.Executor.shutdown` for freeing
class is a :term:`context manager` and can be used within a :keyword:`with` resources. The class is a :term:`context manager` and can be used within a
statement to assure that resources are automatically released when currently :keyword:`with` statement to assure that resources are automatically released
pending futures are done executing. when currently pending futures are done executing.
A simple of example of :class:`~concurrent.futures.ThreadPoolExecutor` is a A simple of example of :class:`~concurrent.futures.ThreadPoolExecutor` is a
launch of four parallel threads for copying directories:: launch of four parallel threads for copying files::
import shutil import shutil
with ThreadPoolExecutor(max_workers=4) as e: with ThreadPoolExecutor(max_workers=4) as e:
@ -242,18 +242,19 @@ launch of four parallel threads for copying directories::
e.submit(shutil.copy, 'src3.txt', 'dest3.txt') e.submit(shutil.copy, 'src3.txt', 'dest3.txt')
e.submit(shutil.copy, 'src3.txt', 'dest4.txt') e.submit(shutil.copy, 'src3.txt', 'dest4.txt')
Also see :ref:`code for threaded parallel URL reads<threadpoolexecutor-example>`
for an example using threads to fetch multiple web pages in parallel.
Or, for an example of :class:`~concurrent.futures.ProcessPoolExecutor`, see
:ref:`code for computing prime numbers in
parallel<processpoolexecutor-example>`.
.. seealso:: .. seealso::
:pep:`3148` - Futures -- Execute Computations Asynchronously :pep:`3148` - Futures -- Execute Computations Asynchronously
PEP written by Brain Quinlan. PEP written by Brain Quinlan.
:ref:`Code for Threaded Parallel URL reads<threadpoolexecutor-example>`, an
example using threads to fetch multiple web pages in parallel.
:ref:`Code for computing prime numbers in
parallel<processpoolexecutor-example>`, an example demonstrating
:class:`~concurrent.futures.ProcessPoolExecutor`.
PEP 3147: PYC Repository Directories PEP 3147: PYC Repository Directories
===================================== =====================================