bpo-40443: Remove unused imports in tests (GH-19805)

Author: vstinner

Lib/test/test_parser.py

@@ -8,7 +8,6 @@
 import unittest
 import operator
 import struct
-import sys
 from test import support
 from test.support.script_helper import assert_python_failure
 from test.support.script_helper import assert_python_ok

Lib/test/test_peg_parser.py

@@ -1,9 +1,6 @@
 import ast
-import os
-import sys
 import _peg_parser as peg_parser
 import unittest
-from pathlib import PurePath
 from typing import Any, Union, Iterable, Tuple
 from textwrap import dedent
 from test import support

Lib/test/test_platform.py

@@ -3,7 +3,6 @@
 import subprocess
 import sys
 import unittest
-import collections
 from unittest import mock
 
 from test import support

Lib/test/test_positional_only_arg.py

@@ -3,7 +3,6 @@
 import dis
 import pickle
 import unittest
-import sys
 
 from test.support import check_syntax_error, use_old_parser
 

Lib/test/test_pstats.py

@@ -5,7 +5,6 @@
 from pstats import SortKey
 
 import pstats
-import time
 import cProfile
 
 class AddCallersTestCase(unittest.TestCase):

Lib/test/test_re.py

@@ -2217,7 +2217,7 @@ def test_re_benchmarks(self):
 
     def test_re_tests(self):
         're_tests test suite'
-        from test.re_tests import tests, SUCCEED, FAIL, SYNTAX_ERROR
+        from test.re_tests import tests, FAIL, SYNTAX_ERROR
         for t in tests:
             pattern = s = outcome = repl = expected = None
             if len(t) == 5:

Lib/test/test_regrtest.py

@@ -5,7 +5,6 @@
 """
 
 import contextlib
-import faulthandler
 import glob
 import io
 import os.path

Lib/test/test_string_literals.py

@@ -33,7 +33,7 @@
 import tempfile
 import unittest
 import warnings
-from test.support import check_syntax_warning, use_old_parser
+from test.support import use_old_parser
 
 
 TEMPLATE = r"""# coding: %s

Lib/test/test_support.py

@@ -1,4 +1,3 @@
-import contextlib
 import errno
 import importlib
 import io

Lib/test/test_syntax.py

@@ -644,7 +644,6 @@
 """
 
 import re
-import sys
 import unittest
 
 from test import support