asyncio: Fix pyflakes errors

- Add a missing import
- Remove an unused import
- Remove unused variables

3 files changed, 2 insertions, 5 deletions

diff --git a/Lib/test/test_asyncio/test_selector_events.py b/Lib/test/test_asyncio/test_selector_events.py
index b1148d2..7c84f03 100644
--- a/Lib/test/test_asyncio/test_selector_events.py
+++ b/Lib/test/test_asyncio/test_selector_events.py
@@ -108,10 +108,7 @@ class BaseSelectorEventLoopTests(test_utils.TestCase):
         self.assertRaises(RuntimeError, self.loop.add_writer, fd, callback)
 
     def test_close_no_selector(self):
-        ssock = self.loop._ssock
-        csock = self.loop._csock
-        remove_reader = self.loop.remove_reader = mock.Mock()
-
+        self.loop.remove_reader = mock.Mock()
         self.loop._selector.close()
         self.loop._selector = None
         self.loop.close()
diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index 0ed2f94..e95c7dc 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -1,6 +1,5 @@
 """Tests for tasks.py."""
 
-import gc
 import os.path
 import sys
 import types
diff --git a/Lib/test/test_asyncio/test_windows_events.py b/Lib/test/test_asyncio/test_windows_events.py
index ca79c43..4ab56e6 100644
--- a/Lib/test/test_asyncio/test_windows_events.py
+++ b/Lib/test/test_asyncio/test_windows_events.py
@@ -9,6 +9,7 @@ import _winapi
 
 import asyncio
 from asyncio import _overlapped
+from asyncio import test_utils
 from asyncio import windows_events