[Python-checkins] bpo-31641: Allow arbitrary iterables in `concurrent.futures.as_completed()` (#3830)
Łukasz Langa
webhook-mailer at python.org
Fri Sep 29 17:33:36 EDT 2017
https://github.com/python/cpython/commit/574562c5ddb2f0429aab9af762442e6f9a3f26ab
commit: 574562c5ddb2f0429aab9af762442e6f9a3f26ab
branch: master
author: Łukasz Langa <lukasz at langa.pl>
committer: GitHub <noreply at github.com>
date: 2017-09-29T14:33:34-07:00
summary:
bpo-31641: Allow arbitrary iterables in `concurrent.futures.as_completed()` (#3830)
This was possible before. GH-1560 introduced a regression after 3.6.2 got
released where only sequences were accepted now. This commit addresses this
problem.
files:
M Lib/concurrent/futures/_base.py
M Lib/test/test_concurrent_futures.py
diff --git a/Lib/concurrent/futures/_base.py b/Lib/concurrent/futures/_base.py
index 70c7b619593..6bace6c7464 100644
--- a/Lib/concurrent/futures/_base.py
+++ b/Lib/concurrent/futures/_base.py
@@ -214,9 +214,8 @@ def as_completed(fs, timeout=None):
if timeout is not None:
end_time = timeout + time.time()
- total_futures = len(fs)
-
fs = set(fs)
+ total_futures = len(fs)
with _AcquireFutures(fs):
finished = set(
f for f in fs
diff --git a/Lib/test/test_concurrent_futures.py b/Lib/test/test_concurrent_futures.py
index 57dc994d284..e4c9ace9356 100644
--- a/Lib/test/test_concurrent_futures.py
+++ b/Lib/test/test_concurrent_futures.py
@@ -7,6 +7,7 @@
from test.support.script_helper import assert_python_ok
+import itertools
import os
import sys
import threading
@@ -395,8 +396,11 @@ def test_zero_timeout(self):
def test_duplicate_futures(self):
# Issue 20367. Duplicate futures should not raise exceptions or give
# duplicate responses.
+ # Issue #31641: accept arbitrary iterables.
future1 = self.executor.submit(time.sleep, 2)
- completed = [f for f in futures.as_completed([future1,future1])]
+ completed = [
+ f for f in futures.as_completed(itertools.repeat(future1, 3))
+ ]
self.assertEqual(len(completed), 1)
def test_free_reference_yielded_future(self):
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