asyncio.subprocess: Replace Process.get_subprocess() method with a
Process.subprocess read-only property
diff --git a/Lib/asyncio/subprocess.py b/Lib/asyncio/subprocess.py
index 4312d44..3047894 100644
--- a/Lib/asyncio/subprocess.py
+++ b/Lib/asyncio/subprocess.py
@@ -106,7 +106,8 @@
         yield from waiter
         return waiter.result()
 
-    def get_subprocess(self):
+    @property
+    def subprocess(self):
         return self._transport.get_extra_info('subprocess')
 
     def _check_alive(self):