bpo-39529: Deprecate creating new event loop in asyncio.get_event_loop() (GH-23554)

asyncio.get_event_loop() emits now a deprecation warning when it creates a new event loop.
In future releases it will became an alias of asyncio.get_running_loop().

1 files changed, 9 insertions, 0 deletions

diff --git a/Misc/NEWS.d/next/Library/2020-12-06-20-21-16.bpo-39529.9Zrg43.rst b/Misc/NEWS.d/next/Library/2020-12-06-20-21-16.bpo-39529.9Zrg43.rst
new file mode 100644
index 0000000..bb1fd82
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-12-06-20-21-16.bpo-39529.9Zrg43.rst
@@ -0,0 +1,9 @@
+Deprecated use of :func:`asyncio.get_event_loop` without running event loop.
+Emit deprecation warning for :mod:`asyncio` functions which implicitly
+create a :class:`~asyncio.Future` or :class:`~asyncio.Task` objects if there
+is no running event loop and no explicit *loop* argument is passed:
+:func:`~asyncio.ensure_future`, :func:`~asyncio.wrap_future`,
+:func:`~asyncio.gather`, :func:`~asyncio.shield`,
+:func:`~asyncio.as_completed` and constructors of :class:`~asyncio.Future`,
+:class:`~asyncio.Task`, :class:`~asyncio.StreamReader`,
+:class:`~asyncio.StreamReaderProtocol`.