bpo-33238: Add InvalidStateError to concurrent.futures. (GH-7056)
Future.set_result and Future.set_exception now raise InvalidStateError
if the futures are not pending or running. This mirrors the behavior
of asyncio.Future, and prevents AssertionErrors in asyncio.wrap_future
when set_result is called multiple times.
diff --git a/Lib/asyncio/base_futures.py b/Lib/asyncio/base_futures.py
index 5182884..bd65bee 100644
--- a/Lib/asyncio/base_futures.py
+++ b/Lib/asyncio/base_futures.py
@@ -1,17 +1,13 @@
__all__ = ()
-import concurrent.futures._base
+import concurrent.futures
import reprlib
from . import format_helpers
-Error = concurrent.futures._base.Error
CancelledError = concurrent.futures.CancelledError
TimeoutError = concurrent.futures.TimeoutError
-
-
-class InvalidStateError(Error):
- """The operation is not allowed in this state."""
+InvalidStateError = concurrent.futures.InvalidStateError
# States for Future.