bpo-35202: Remove unused imports in Lib directory. (GH-10446)

Lib/lib2to3/pgen2/driver.py

@@ -16,7 +16,6 @@ __author__ = "Guido van Rossum <guido@python.org>"
 __all__ = ["Driver", "load_grammar"]
 
 # Python imports
-import codecs
 import io
 import os
 import logging

Lib/lib2to3/pgen2/grammar.py

@@ -13,7 +13,6 @@ fallback token code OP, but the parser needs the actual token code.
 """
 
 # Python imports
-import collections
 import pickle
 
 # Local imports

Lib/multiprocessing/popen_fork.py

 import os
-import sys
 import signal
 
 from . import util

Lib/test/test_collections.py

@@ -3,11 +3,9 @@
 import collections
 import copy
 import doctest
-import keyword
 import operator
 import pickle
 from random import choice, randrange
-import re
 import string
 import sys
 from test import support

Lib/test/test_queue.py

 # Some simple queue module tests, plus some failure conditions
 # to ensure the Queue locks remain stable.
-import collections
 import itertools
 import queue
 import random
-import sys
 import threading
 import time
 import unittest

Lib/test/test_sys.py

@@ -10,7 +10,6 @@ import codecs
 import gc
 import sysconfig
 import locale
-import threading
 
 # count the number of test runs, used to create unique
 # strings to intern in test_intern()

Lib/test/test_thread.py

@@ -4,7 +4,6 @@ import random
 from test import support
 import _thread as thread
 import time
-import sys
 import weakref
 
 from test import lock_tests