give the threading API PEP 8 names
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index ba5eea9..1287dd1 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -107,7 +107,7 @@
             self.clientRun, (test_method,))
 
         self.__setUp()
-        if not self.server_ready.isSet():
+        if not self.server_ready.is_set():
             self.server_ready.set()
         self.client_ready.wait()