/usr/lib/python3.5/asyncio/ is in libpython3.5-stdlib 3.5.3-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3.5/asyncio/__init__.py
/usr/lib/python3.5/asyncio/base_events.py
/usr/lib/python3.5/asyncio/base_subprocess.py
/usr/lib/python3.5/asyncio/compat.py
/usr/lib/python3.5/asyncio/constants.py
/usr/lib/python3.5/asyncio/coroutines.py
/usr/lib/python3.5/asyncio/events.py
/usr/lib/python3.5/asyncio/futures.py
/usr/lib/python3.5/asyncio/locks.py
/usr/lib/python3.5/asyncio/log.py
/usr/lib/python3.5/asyncio/proactor_events.py
/usr/lib/python3.5/asyncio/protocols.py
/usr/lib/python3.5/asyncio/queues.py
/usr/lib/python3.5/asyncio/selector_events.py
/usr/lib/python3.5/asyncio/sslproto.py
/usr/lib/python3.5/asyncio/streams.py
/usr/lib/python3.5/asyncio/subprocess.py
/usr/lib/python3.5/asyncio/tasks.py
/usr/lib/python3.5/asyncio/test_utils.py
/usr/lib/python3.5/asyncio/transports.py
/usr/lib/python3.5/asyncio/unix_events.py
/usr/lib/python3.5/asyncio/windows_events.py
/usr/lib/python3.5/asyncio/windows_utils.py