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

diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 3726c55..f5ab6e7 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -18,7 +18,6 @@
 import concurrent.futures
 import heapq
 import itertools
-import logging
 import os
 import socket
 import subprocess
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index 7993fcb..4302708 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/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
diff --git a/Lib/test/test_contextlib.py b/Lib/test/test_contextlib.py
index 2a44404..755d9b9 100644
--- a/Lib/test/test_contextlib.py
+++ b/Lib/test/test_contextlib.py
@@ -1,6 +1,5 @@
 """Unit tests for contextlib.py, and other context managers."""
 
-import asyncio
 import io
 import sys
 import tempfile
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index f923311..8c52380 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -15,7 +15,6 @@
 import sysconfig
 import tempfile
 import textwrap
-import threading
 import unittest
 from test import libregrtest
 from test import support
diff --git a/Lib/test/test_uuid.py b/Lib/test/test_uuid.py
index c1b35c4..dc502b9 100644
--- a/Lib/test/test_uuid.py
+++ b/Lib/test/test_uuid.py
@@ -3,7 +3,6 @@
 import builtins
 import contextlib
 import copy
-from functools import partial
 import io
 import os
 import pickle