gh-134357: Remove unused imports in tests (#134340)

Lib/test/.ruff.toml

@@ -19,5 +19,12 @@ extend-exclude = [
 
 [lint]
 select = [
+    "F401",  # Unused import
     "F811",  # Redefinition of unused variable (useful for finding test methods with the same name)
 ]
+
+[lint.per-file-ignores]
+"*/**/__main__.py" = ["F401"]  # Unused import
+"test_import/*.py" = ["F401"]  # Unused import
+"test_importlib/*.py" = ["F401"]  # Unused import
+"typinganndata/partialexecution/*.py" = ["F401"]  # Unused import

Lib/test/support/__init__.py

@@ -1101,7 +1101,6 @@ class _MemoryWatchdog:
         self.started = False
 
     def start(self):
-        import warnings
         try:
             f = open(self.procfile, 'r')
         except OSError as e:
@@ -2728,7 +2727,7 @@ def iter_builtin_types():
     # Fall back to making a best-effort guess.
     if hasattr(object, '__flags__'):
         # Look for any type object with the Py_TPFLAGS_STATIC_BUILTIN flag set.
-        import datetime
+        import datetime  # noqa: F401
         seen = set()
         for cls, subs in walk_class_hierarchy(object):
             if cls in seen:

Lib/test/support/interpreters/channels.py

@@ -6,8 +6,8 @@ from . import _crossinterp
 
 # aliases:
 from _interpchannels import (
-    ChannelError, ChannelNotFoundError, ChannelClosedError,
+    ChannelError, ChannelNotFoundError, ChannelClosedError,  # noqa: F401
-    ChannelEmptyError, ChannelNotEmptyError,
+    ChannelEmptyError, ChannelNotEmptyError,  # noqa: F401
 )
 from ._crossinterp import (
     UNBOUND_ERROR, UNBOUND_REMOVE,

Lib/test/support/interpreters/queues.py

@@ -1,6 +1,5 @@
 """Cross-interpreter Queues High Level Module."""
 
-import pickle
 import queue
 import time
 import weakref

Lib/test/test_capi/test_config.py

@@ -3,7 +3,6 @@ Tests PyConfig_Get() and PyConfig_Set() C API (PEP 741).
 """
 import os
 import sys
-import sysconfig
 import types
 import unittest
 from test import support

Lib/test/test_codeccallbacks.py

@@ -2,7 +2,6 @@ from _codecs import _unregister_error as _codecs_unregister_error
 import codecs
 import html.entities
 import itertools
-import re
 import sys
 import unicodedata
 import unittest

Lib/test/test_crossinterp.py

@@ -1,6 +1,4 @@
 import contextlib
-import importlib
-import importlib.util
 import itertools
 import sys
 import types

Lib/test/test_ctypes/_support.py

@@ -3,7 +3,6 @@
 import ctypes
 from _ctypes import Structure, Union, _Pointer, Array, _SimpleCData, CFuncPtr
 import sys
-from test import support
 
 
 _CData = Structure.__base__

Lib/test/test_ctypes/test_byteswap.py

@@ -1,5 +1,4 @@
 import binascii
-import ctypes
 import math
 import struct
 import sys

Lib/test/test_ctypes/test_generated_structs.py

@@ -10,7 +10,7 @@ Run this module to regenerate the files:
 """
 
 import unittest
-from test.support import import_helper, verbose
+from test.support import import_helper
 import re
 from dataclasses import dataclass
 from functools import cached_property

Lib/test/test_decimal.py

@@ -28,7 +28,6 @@ import logging
 import math
 import os, sys
 import operator
-import warnings
 import pickle, copy
 import unittest
 import numbers

Lib/test/test_generated_cases.py

@@ -1,11 +1,9 @@
 import contextlib
 import os
-import re
 import sys
 import tempfile
 import unittest
 
-from io import StringIO
 from test import support
 from test import test_tools
 
@@ -31,12 +29,11 @@ skip_if_different_mount_drives()
 
 test_tools.skip_if_missing("cases_generator")
 with test_tools.imports_under_tool("cases_generator"):
-    from analyzer import analyze_forest, StackItem
+    from analyzer import StackItem
     from cwriter import CWriter
     import parser
     from stack import Local, Stack
     import tier1_generator
-    import opcode_metadata_generator
     import optimizer_generator
 
 

Lib/test/test_genericpath.py

@@ -8,7 +8,7 @@ import sys
 import unittest
 import warnings
 from test.support import (
-    is_apple, is_emscripten, os_helper, warnings_helper
+    is_apple, os_helper, warnings_helper
 )
 from test.support.script_helper import assert_python_ok
 from test.support.os_helper import FakePath

Lib/test/test_gzip.py

@@ -9,7 +9,6 @@ import os
 import struct
 import sys
 import unittest
-import warnings
 from subprocess import PIPE, Popen
 from test.support import catch_unraisable_exception
 from test.support import import_helper

Lib/test/test_hashlib.py

@@ -17,7 +17,6 @@ import sysconfig
 import tempfile
 import threading
 import unittest
-import warnings
 from test import support
 from test.support import _4G, bigmemtest
 from test.support import hashlib_helper

Lib/test/test_hmac.py

@@ -21,7 +21,6 @@ import functools
 import hmac
 import hashlib
 import random
-import test.support
 import test.support.hashlib_helper as hashlib_helper
 import types
 import unittest

Lib/test/test_idle.py

@@ -16,7 +16,7 @@ idlelib.testing = True
 
 # Unittest.main and test.libregrtest.runtest.runtest_inner
 # call load_tests, when present here, to discover tests to run.
-from idlelib.idle_test import load_tests
+from idlelib.idle_test import load_tests  # noqa: F401
 
 if __name__ == '__main__':
     tk.NoDefaultRoot()

Lib/test/test_interpreters/test_queues.py

@@ -9,7 +9,6 @@ from test.support import import_helper, Py_DEBUG
 _queues = import_helper.import_module('_interpqueues')
 from test.support import interpreters
 from test.support.interpreters import queues, _crossinterp
-import test._crossinterp_definitions as defs
 from .utils import _run_output, TestBase as _TestBase
 
 

Lib/test/test_interpreters/utils.py

@@ -12,7 +12,6 @@ from textwrap import dedent
 import threading
 import types
 import unittest
-import warnings
 
 from test import support
 

Lib/test/test_ntpath.py

@@ -6,8 +6,7 @@ import subprocess
 import sys
 import unittest
 import warnings
-from test.support import cpython_only, os_helper
+from test.support import TestFailed, cpython_only, os_helper
-from test.support import TestFailed, is_emscripten
 from test.support.os_helper import FakePath
 from test import test_genericpath
 from tempfile import TemporaryFile

Lib/test/test_peepholer.py

@@ -12,7 +12,7 @@ except ImportError:
 
 from test import support
 from test.support.bytecode_helper import (
-    BytecodeTestCase, CfgOptimizationTestCase, CompilationStepTestCase)
+    BytecodeTestCase, CfgOptimizationTestCase)
 
 
 def compile_pattern_with_fast_locals(pattern):

Lib/test/test_pty.py

@@ -20,7 +20,6 @@ import select
 import signal
 import socket
 import io # readline
-import warnings
 
 TEST_STRING_1 = b"I wish to buy a fish license.\n"
 TEST_STRING_2 = b"For my pet fish, Eric.\n"

Lib/test/test_pydoc/test_pydoc.py

@@ -553,7 +553,7 @@ class PydocDocTest(unittest.TestCase):
             # of the known subclasses of object. (doc.docclass() used to
             # fail if HeapType was imported before running this test, like
             # when running tests sequentially.)
-            from _testcapi import HeapType
+            from _testcapi import HeapType  # noqa: F401
         except ImportError:
             pass
         text = doc.docclass(object)

Lib/test/test_remote_pdb.py

@@ -1,5 +1,4 @@
 import io
-import time
 import itertools
 import json
 import os
@@ -8,16 +7,13 @@ import signal
 import socket
 import subprocess
 import sys
-import tempfile
 import textwrap
-import threading
 import unittest
 import unittest.mock
 from contextlib import closing, contextmanager, redirect_stdout, redirect_stderr, ExitStack
-from pathlib import Path
 from test.support import is_wasi, cpython_only, force_color, requires_subprocess, SHORT_TIMEOUT
-from test.support.os_helper import temp_dir, TESTFN, unlink
+from test.support.os_helper import TESTFN, unlink
-from typing import Dict, List, Optional, Tuple, Union, Any
+from typing import List
 
 import pdb
 from pdb import _PdbServer, _PdbClient
@@ -1434,7 +1430,6 @@ class PdbConnectTestCase(unittest.TestCase):
 
 
 def _supports_remote_attaching():
-    from contextlib import suppress
     PROCESS_VM_READV_SUPPORTED = False
 
     try:

Lib/test/test_shutil.py

@@ -3492,7 +3492,7 @@ class PublicAPITests(unittest.TestCase):
             target_api.append('disk_usage')
         self.assertEqual(set(shutil.__all__), set(target_api))
         with self.assertWarns(DeprecationWarning):
-            from shutil import ExecError
+            from shutil import ExecError  # noqa: F401
 
 
 if __name__ == '__main__':

Lib/test/test_string/_support.py

@@ -1,4 +1,3 @@
-import unittest
 from string.templatelib import Interpolation
 
 

Lib/test/test_sysconfig.py

@@ -32,7 +32,6 @@ from sysconfig import (get_paths, get_platform, get_config_vars,
 from sysconfig.__main__ import _main, _parse_makefile, _get_pybuilddir, _get_json_data_name
 import _imp
 import _osx_support
-import _sysconfig
 
 
 HAS_USER_BASE = sysconfig._HAS_USER_BASE

Lib/test/test_threading.py

@@ -1253,7 +1253,7 @@ class ThreadTests(BaseTestCase):
         # its state should be removed from interpreter' thread states list
         # to avoid its double cleanup
         try:
-            from resource import setrlimit, RLIMIT_NPROC
+            from resource import setrlimit, RLIMIT_NPROC  # noqa: F401
         except ImportError as err:
             self.skipTest(err)  # RLIMIT_NPROC is specific to Linux and BSD
         code = """if 1:

Lib/test/test_tools/i18n_data/docstrings.py

@@ -1,7 +1,7 @@
 """Module docstring"""
 
 # Test docstring extraction
-from gettext import gettext as _
+from gettext import gettext as _  # noqa: F401
 
 
 # Empty docstring

Lib/test/test_types.py

@@ -2516,7 +2516,7 @@ class SubinterpreterTests(unittest.TestCase):
             from test.support import interpreters
         except ModuleNotFoundError:
             raise unittest.SkipTest('subinterpreters required')
-        import test.support.interpreters.channels
+        import test.support.interpreters.channels  # noqa: F401
 
     @cpython_only
     @no_rerun('channels (and queues) might have a refleak; see gh-122199')

Lib/test/test_typing.py

@@ -46,11 +46,10 @@ import abc
 import textwrap
 import typing
 import weakref
-import warnings
 import types
 
 from test.support import (
-    captured_stderr, cpython_only, infinite_recursion, requires_docstrings, import_helper, run_code,
+    captured_stderr, cpython_only, requires_docstrings, import_helper, run_code,
     EqualToForwardRef,
 )
 from test.typinganndata import (

Lib/test/test_venv.py

@@ -1008,7 +1008,7 @@ class EnsurePipTest(BaseTest):
                      err, flags=re.MULTILINE)
         # Ignore warning about missing optional module:
         try:
-            import ssl
+            import ssl  # noqa: F401
         except ImportError:
             err = re.sub(
                 "^WARNING: Disabling truststore since ssl support is missing$",

Lib/test/test_webbrowser.py

@@ -6,7 +6,6 @@ import subprocess
 import sys
 import unittest
 import webbrowser
-from functools import partial
 from test import support
 from test.support import import_helper
 from test.support import is_apple_mobile

Lib/test/test_zipfile/__main__.py

@@ -1,6 +1,6 @@
 import unittest
 
-from . import load_tests  # noqa: F401
+from . import load_tests
 
 
 if __name__ == "__main__":

Lib/test/test_zstd.py

@@ -12,7 +12,6 @@ import threading
 from test.support.import_helper import import_module
 from test.support import threading_helper
 from test.support import _1M
-from test.support import Py_GIL_DISABLED
 
 _zstd = import_module("_zstd")
 zstd = import_module("compression.zstd")