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-rw-r--r--Lib/asyncio/proactor_events.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/asyncio/proactor_events.py b/Lib/asyncio/proactor_events.py
index c6aab408fc7..1e2a730cf36 100644
--- a/Lib/asyncio/proactor_events.py
+++ b/Lib/asyncio/proactor_events.py
@@ -288,7 +288,8 @@ class _ProactorReadPipeTransport(_ProactorBasePipeTransport,
# we got end-of-file so no need to reschedule a new read
return
- data = self._data[:length]
+ # It's a new slice so make it immutable so protocols upstream don't have problems
+ data = bytes(memoryview(self._data)[:length])
else:
# the future will be replaced by next proactor.recv call
fut.cancel()