Replace IOError with OSError (#16715)
diff --git a/Lib/test/test_epoll.py b/Lib/test/test_epoll.py
index a3d4e2d..7077a70 100644
--- a/Lib/test/test_epoll.py
+++ b/Lib/test/test_epoll.py
@@ -33,7 +33,7 @@
 
 try:
     select.epoll()
-except IOError as e:
+except OSError as e:
     if e.errno == errno.ENOSYS:
         raise unittest.SkipTest("kernel doesn't support epoll()")
     raise
@@ -122,12 +122,12 @@
             # ValueError: file descriptor cannot be a negative integer (-1)
             self.assertRaises(ValueError, ep.register, -1,
                 select.EPOLLIN | select.EPOLLOUT)
-            # IOError: [Errno 9] Bad file descriptor
-            self.assertRaises(IOError, ep.register, 10000,
+            # OSError: [Errno 9] Bad file descriptor
+            self.assertRaises(OSError, ep.register, 10000,
                 select.EPOLLIN | select.EPOLLOUT)
             # registering twice also raises an exception
             ep.register(server, select.EPOLLIN | select.EPOLLOUT)
-            self.assertRaises(IOError, ep.register, server,
+            self.assertRaises(OSError, ep.register, server,
                 select.EPOLLIN | select.EPOLLOUT)
         finally:
             ep.close()
@@ -149,7 +149,7 @@
         ep.close()
         try:
             ep2.poll(1, 4)
-        except IOError as e:
+        except OSError as e:
             self.assertEqual(e.args[0], errno.EBADF, e)
         else:
             self.fail("epoll on closed fd didn't raise EBADF")