Fix Windows loop

homeassistant/__main__.py

@@ -19,15 +19,19 @@ from homeassistant.const import (
 )
 
 
-def attempt_use_uvloop() -> None:
+def set_loop() -> None:
     """Attempt to use uvloop."""
     import asyncio
-    try:
-        import uvloop
-    except ImportError:
-        pass
+
+    if sys.platform == 'win32':
+        asyncio.set_event_loop(asyncio.ProactorEventLoop())
     else:
-        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+        try:
+            import uvloop
+        except ImportError:
+            pass
+        else:
+            asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
 
 
 def validate_python() -> None:
@@ -345,7 +349,7 @@ def main() -> int:
             monkey_patch.disable_c_asyncio()
         monkey_patch.patch_weakref_tasks()
 
-    attempt_use_uvloop()
+    set_loop()
 
     args = get_arguments()
 

homeassistant/core.py

@@ -129,10 +129,7 @@ class HomeAssistant:
             self,
             loop: Optional[asyncio.events.AbstractEventLoop] = None) -> None:
         """Initialize new Home Assistant object."""
-        if sys.platform == 'win32':
-            self.loop = loop or asyncio.ProactorEventLoop()
-        else:
-            self.loop = loop or asyncio.get_event_loop()
+        self.loop = loop or asyncio.get_event_loop()
 
         executor_opts = {'max_workers': None}  # type: Dict[str, Any]
         if sys.version_info[:2] >= (3, 6):