Remove unused stdlib imports and add Ruff F401

Author: hugovk

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: e05c5c0818279e5ac248ac9e954431ba58865e61  # frozen: v0.15.7
+    rev: 3b3f7c3f57fe9925356faf5fe6230835138be230  # frozen: v0.15.17
     hooks:
       - id: ruff-check
         name: Run Ruff (lint) on Platforms/Apple/
@@ -10,6 +10,11 @@ repos:
         name: Run Ruff (lint) on Doc/
         args: [--exit-non-zero-on-fix]
         files: ^Doc/
+      - id: ruff-check
+        name: Run Ruff (lint) on Lib/
+        args: [--exit-non-zero-on-fix]
+        files: ^Lib/
+        exclude: ^Lib/test/
       - id: ruff-check
         name: Run Ruff (lint) on Lib/test/
         args: [--exit-non-zero-on-fix]

Lib/.ruff.toml

@@ -0,0 +1,21 @@
+extend = "../.ruff.toml"  # Inherit the project-wide settings
+
+# Unlike Tools/, stdlib can use newer syntax than PYTHON_FOR_REGEN
+target-version = "py315"
+
+[lint]
+select = [
+    "F401",  # Unused import
+]
+
+[lint.per-file-ignores]
+"ctypes/__init__.py" = ["F401"]  # Re-exports from _ctypes
+"ensurepip/__init__.py" = ["F401"]  # `import zlib` availability check
+"idlelib/idle_test/htest.py" = ["F401"]  # Import for Windows DPI side effect
+"idlelib/idle_test/test_iomenu.py" = ["F401"]  # Imports checked for existence
+"importlib/_abc.py" = ["F401"]  # Bootstrap-sensitive _bootstrap import
+"importlib/machinery.py" = ["F401"]  # NamespacePath re-export
+"importlib/metadata/__init__.py" = ["F401"]  # Synced from importlib_metadata
+"profiling/sampling/sample.py" = ["F401"]  # Re-exports PROFILING_MODE_* constants
+"ssl.py" = ["F401"]  # Re-exports from _ssl
+"warnings.py" = ["F401"]  # Re-exports from _py_warnings

Lib/_pyrepl/completing_reader.py

@@ -32,7 +32,7 @@
 # types
 Command = commands.Command
 if TYPE_CHECKING:
-    from .types import CommandName, CompletionAction, Keymap, KeySpec
+    from .types import CompletionAction, Keymap
 
 
 def prefix(wordlist: list[str], j: int = 0) -> str:

Lib/_pyrepl/reader.py

@@ -38,7 +38,7 @@
 )
 from .layout import LayoutMap, LayoutResult, LayoutRow, WrappedRow, layout_content_lines
 from .render import RenderCell, RenderLine, RenderedScreen, ScreenOverlay
-from .utils import ANSI_ESCAPE_SEQUENCE, ColorSpan, THEME, StyleRef, wlen, gen_colors
+from .utils import ANSI_ESCAPE_SEQUENCE, ColorSpan, THEME, StyleRef, gen_colors
 from .trace import trace
 
 

Lib/_pyrepl/unix_console.py

@@ -34,7 +34,7 @@
 from collections.abc import Callable
 from dataclasses import dataclass
 from fcntl import ioctl
-from typing import TYPE_CHECKING, cast, overload
+from typing import TYPE_CHECKING, overload
 
 from . import terminfo
 from .console import Console, Event

Lib/idlelib/idle_test/template.py

@@ -1,6 +1,5 @@
 "Test , coverage %."
 
-from idlelib import zzdummy
 import unittest
 from test.support import requires
 from tkinter import Tk

Lib/idlelib/idle_test/test_help.py

@@ -4,7 +4,6 @@
 import unittest
 from test.support import requires
 requires('gui')
-from os.path import abspath, dirname, join
 from tkinter import Tk
 
 

Lib/profiling/sampling/heatmap_collector.py

@@ -5,11 +5,9 @@
 import html
 import importlib.resources
 import json
-import locale
 import math
 import os
 import platform
-import site
 import sys
 from dataclasses import dataclass, field
 from pathlib import Path

Lib/profiling/sampling/live_collector/collector.py

@@ -18,9 +18,6 @@
     THREAD_STATUS_UNKNOWN,
     THREAD_STATUS_GIL_REQUESTED,
     THREAD_STATUS_HAS_EXCEPTION,
-    PROFILING_MODE_CPU,
-    PROFILING_MODE_GIL,
-    PROFILING_MODE_WALL,
 )
 from .constants import (
     MICROSECONDS_PER_SECOND,

Lib/profiling/sampling/live_collector/display.py

@@ -1,6 +1,5 @@
 """Display interface abstractions for the live profiling collector."""
 
-import contextlib
 import curses
 from abc import ABC, abstractmethod