Update pytest_twisted.py

Author: altendky

pytest_twisted.py

@@ -272,11 +272,12 @@ def init_qt5_reactor():
 
 
 def init_asyncio_reactor():
-    if sys.version_info >= (3, 8):
-        # If twisted releases a fix/workaround we can check that version too
-        # https://twistedmatrix.com/trac/ticket/9766
-        selector_policy = asyncio.WindowsSelectorEventLoopPolicy()
-        asyncio.set_event_loop_policy(selector_policy)
+    if sys.platform == 'win32':
+        if sys.version_info >= (3, 8):
+            # If twisted releases a fix/workaround we can check that version too
+            # https://twistedmatrix.com/trac/ticket/9766
+            selector_policy = asyncio.WindowsSelectorEventLoopPolicy()
+            asyncio.set_event_loop_policy(selector_policy)
 
     from twisted.internet import asyncioreactor