avoid deprecated asyncio.get_event_loop

uvicorn/loops/asyncio.py

@@ -1,19 +1,7 @@
 import asyncio
-import platform
-import selectors
 import sys
 
 
 def asyncio_setup() -> None:  # pragma: no cover
-    loop: asyncio.AbstractEventLoop
-    if (
-        sys.version_info.major >= 3
-        and sys.version_info.minor >= 8
-        and platform.system() == "Windows"
-    ):
-        selector = selectors.SelectSelector()
-        loop = asyncio.SelectorEventLoop(selector)
-        asyncio.set_event_loop(loop)
-    else:
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
+    if sys.version_info >= (3, 8) and sys.platform == "win32":
+        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

uvicorn/server.py

@@ -46,8 +46,10 @@ def __init__(self, config):
 
     def run(self, sockets=None):
         self.config.setup_event_loop()
-        loop = asyncio.get_event_loop()
-        loop.run_until_complete(self.serve(sockets=sockets))
+        if sys.version_info > (3, 6):
+            return asyncio.run(self.serve(sockets=sockets))
+        else:
+            return asyncio.get_event_loop().run_until_complete(self.serve(sockets=sockets))
 
     async def serve(self, sockets=None):
         process_id = os.getpid()