Resolve comments

Author: hyongtao-code

Lib/test/test_io/test_bufferedio.py

@@ -10,8 +10,7 @@
 from collections import deque, UserList
 from itertools import cycle, count
 from test import support
-from test.support import check_sanitizer
-from test.support import os_helper, threading_helper
+from test.support import check_sanitizer, os_helper, threading_helper
 from .utils import byteslike, CTestCase, PyTestCase