bpo-35202: Remove unused imports in Lib directory (GH-10450)

Lib/asyncio/base_events.py

@@ -18,7 +18,6 @@ import collections.abc
 import concurrent.futures
 import heapq
 import itertools
-import logging
 import os
 import socket
 import subprocess

Lib/test/_test_multiprocessing.py

@@ -5,7 +5,6 @@
 import unittest
 import unittest.mock
 import queue as pyqueue
-import contextlib
 import time
 import io
 import itertools

Lib/test/test_contextlib.py

 """Unit tests for contextlib.py, and other context managers."""
 
-import asyncio
 import io
 import sys
 import tempfile

Lib/test/test_regrtest.py

@@ -15,7 +15,6 @@ import sys
 import sysconfig
 import tempfile
 import textwrap
-import threading
 import unittest
 from test import libregrtest
 from test import support

Lib/test/test_uuid.py

@@ -3,7 +3,6 @@ from test import support
 import builtins
 import contextlib
 import copy
-from functools import partial
 import io
 import os
 import pickle