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-rw-r--r--Lib/concurrent/futures/_base.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/Lib/concurrent/futures/_base.py b/Lib/concurrent/futures/_base.py
index 3d03280..c3b1f01 100644
--- a/Lib/concurrent/futures/_base.py
+++ b/Lib/concurrent/futures/_base.py
@@ -181,7 +181,8 @@ def as_completed(fs, timeout=None):
Returns:
An iterator that yields the given Futures as they complete (finished or
- cancelled).
+ cancelled). If any given Futures are duplicated, they will be returned
+ once.
Raises:
TimeoutError: If the entire result iterator could not be generated
@@ -190,11 +191,12 @@ def as_completed(fs, timeout=None):
if timeout is not None:
end_time = timeout + time.time()
+ fs = set(fs)
with _AcquireFutures(fs):
finished = set(
f for f in fs
if f._state in [CANCELLED_AND_NOTIFIED, FINISHED])
- pending = set(fs) - finished
+ pending = fs - finished
waiter = _create_and_install_waiters(fs, _AS_COMPLETED)
try: