[PATCH 03/14] python: drop 'is_closing' back compat helper

["Daniel P. Berrangé" <berrange@redhat.com>]

Our minimum python is now 3.9, so back compat with python
3.6 is no longer required.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 python/qemu/qmp/protocol.py |  3 +--
 python/qemu/qmp/util.py     | 16 ----------------
 2 files changed, 1 insertion(+), 18 deletions(-)

diff --git a/python/qemu/qmp/protocol.py b/python/qemu/qmp/protocol.py
index a4ffdfad51..9a7ada4a1e 100644
--- a/python/qemu/qmp/protocol.py
+++ b/python/qemu/qmp/protocol.py
@@ -39,7 +39,6 @@
     create_task,
     exception_summary,
     flush,
-    is_closing,
     pretty_traceback,
     upper_half,
     wait_closed,
@@ -825,7 +824,7 @@ async def _bh_close_stream(self, error_pathway: bool = False) -> None:
         if not self._writer:
             return
 
-        if not is_closing(self._writer):
+        if not self._writer.is_closing():
             self.logger.debug("Closing StreamWriter.")
             self._writer.close()
 
diff --git a/python/qemu/qmp/util.py b/python/qemu/qmp/util.py
index ca6225e9cd..39fc341f2f 100644
--- a/python/qemu/qmp/util.py
+++ b/python/qemu/qmp/util.py
@@ -104,22 +104,6 @@ def create_task(coro: Coroutine[Any, Any, T],
     return asyncio.ensure_future(coro, loop=loop)
 
 
-def is_closing(writer: asyncio.StreamWriter) -> bool:
-    """
-    Python 3.6-compatible `asyncio.StreamWriter.is_closing` wrapper.
-
-    :param writer: The `asyncio.StreamWriter` object.
-    :return: `True` if the writer is closing, or closed.
-    """
-    if sys.version_info >= (3, 7):
-        return writer.is_closing()
-
-    # Python 3.6:
-    transport = writer.transport
-    assert isinstance(transport, asyncio.WriteTransport)
-    return transport.is_closing()
-
-
 async def wait_closed(writer: asyncio.StreamWriter) -> None:
     """
     Python 3.6-compatible `asyncio.StreamWriter.wait_closed` wrapper.
-- 
2.49.0