Fix some flake8 errors

Mainly unused imports, unused variables, unnecessary f-strings, and
regex literals missing the r prefix. I'm not adding it to the CI linter
because it's too noisy, though.

Signed-off-by: Omar Sandoval <osandov@osandov.com>

docs/exts/drgndoc/docstrings.py

@@ -5,7 +5,7 @@
 import argparse
 import functools
 import sys
-from typing import Union, cast
+from typing import cast
 
 from drgndoc.format import Formatter
 from drgndoc.namespace import Namespace, ResolvedNode
@@ -74,7 +74,7 @@ if __name__ == "__main__":
 
     if args.header:
         output_file.write(
-            f"""\
+            """\
 /*
  * Generated by drgndoc.docstrings -H.
  *
@@ -86,7 +86,7 @@ if __name__ == "__main__":
 """
         )
     else:
-        output_file.write(f"/* Generated by drgndoc.docstrings. */\n\n")
+        output_file.write("/* Generated by drgndoc.docstrings. */\n\n")
 
     def aux(resolved: ResolvedNode[Node], name: str) -> None:
         node = resolved.node

docs/exts/drgndoc/ext.py

@@ -42,7 +42,7 @@ file for the C extension itself (drgndoc.docstrings).
 
 import os.path
 import re
-from typing import Any, Dict, List, cast
+from typing import Any, Dict, cast
 
 import docutils.nodes
 import docutils.parsers.rst.directives

docs/exts/drgndoc/namespace.py

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import itertools
-from typing import Generic, Iterator, List, Mapping, Optional, Sequence, TypeVar, Union
+from typing import Generic, Iterator, List, Mapping, Sequence, TypeVar, Union
 
 from drgndoc.parse import (
     Class,
@@ -14,7 +14,6 @@ from drgndoc.parse import (
     Node,
     Variable,
 )
-from drgndoc.util import dot_join
 
 NodeT_co = TypeVar("NodeT_co", bound=Node, covariant=True)
 

docs/exts/drgndoc/visitor.py

@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import ast
-import sys
 from typing import Any, Optional
 
 

drgn/helpers/__init__.py

@@ -23,7 +23,7 @@ useful for scripts or for implementing other helpers.
 
 import enum
 import typing
-from typing import Container, Iterable, List, Tuple
+from typing import Container, Iterable
 
 from drgn import Type
 

drgn/helpers/linux/idr.py

@@ -15,7 +15,7 @@ from typing import Iterator, Tuple
 
 from _drgn import _linux_helper_idr_find as idr_find
 from drgn import Object
-from drgn.helpers.linux.radixtree import radix_tree_for_each, radix_tree_lookup
+from drgn.helpers.linux.radixtree import radix_tree_for_each
 
 __all__ = (
     "idr_find",

drgn/helpers/linux/mm.py

@@ -11,7 +11,7 @@ implemented.
 """
 
 import operator
-from typing import Any, Iterator, List, Optional, Union, overload
+from typing import Iterator, List, Optional, Union, overload
 
 from _drgn import _linux_helper_read_vm
 from drgn import IntegerLike, Object, Program, cast

drgn/helpers/linux/net.py

@@ -15,7 +15,6 @@ from typing import Iterator, Union
 from drgn import NULL, IntegerLike, Object, Program
 from drgn.helpers.linux.list import hlist_for_each_entry
 from drgn.helpers.linux.list_nulls import hlist_nulls_for_each_entry
-from drgn.helpers.linux.tcp import sk_tcpstate
 
 __all__ = (
     "netdev_get_by_index",

drgn/helpers/linux/pid.py

@@ -16,8 +16,8 @@ from _drgn import (
     _linux_helper_find_task as find_task,
     _linux_helper_pid_task as pid_task,
 )
-from drgn import NULL, Object, Program, cast, container_of
-from drgn.helpers.linux.idr import idr_find, idr_for_each
+from drgn import Object, Program, cast, container_of
+from drgn.helpers.linux.idr import idr_for_each
 from drgn.helpers.linux.list import hlist_for_each_entry
 
 __all__ = (

examples/linux/fs_inodes.py

@@ -6,7 +6,6 @@
 
 import os
 import sys
-import time
 
 from drgn.helpers.linux.fs import for_each_mount, inode_path
 from drgn.helpers.linux.list import list_for_each_entry

libdrgn/build-aux/gen_constants.py

@@ -1,7 +1,6 @@
 # Copyright (c) Facebook, Inc. and its affiliates.
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-import os.path
 import re
 import sys
 
@@ -63,7 +62,7 @@ out:
 def gen_constants(input_file, output_file):
     drgn_h = input_file.read()
     output_file.write(
-        f"""\
+        """\
 /* Generated by libdrgn/build-aux/gen_constants.py. */
 
 #include "drgnpy.h"

scripts/iwyu.py

@@ -122,7 +122,7 @@ def gen_python_mapping_file(mapping_path):
         # For some reason, include-what-you-mean wants struct _typeobject, but
         # find-all-symbols only reports PyTypeObject. Add it manually.
         imp.write(
-            f'  {{"symbol": ["_typeobject", "private", "<Python.h>", "public"]}},  # From cpython/object.h\n'
+            '  {{"symbol": ["_typeobject", "private", "<Python.h>", "public"]}},  # From cpython/object.h\n'
         )
 
         imp.write("]\n")

setup.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # setuptools must be imported before distutils (see pypa/setuptools#2230).
-import setuptools  # isort: skip
+import setuptools  # isort: skip  # noqa: F401
 
 import contextlib
 from distutils import log

tests/__init__.py

@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import functools
-import types
 from typing import Any, NamedTuple, Optional
 import unittest
 

tests/helpers/linux/test_fs.py

@@ -51,9 +51,9 @@ class TestFs(LinuxHelperTestCase):
         with tempfile.TemporaryDirectory(prefix="drgn-tests-") as dir:
             path1 = os.fsencode(os.path.abspath(os.path.join(dir, "a")))
             path2 = os.fsencode(os.path.abspath(os.path.join(dir, "b")))
-            with open(path1, "w") as f:
+            with open(path1, "w"):
                 os.link(path1, path2)
-                with open(path2, "r") as f:
+                with open(path2, "r"):
                     inode = path_lookup(self.prog, path1).dentry.d_inode
                     paths = list(inode_paths(inode))
                     self.assertEqual(len(paths), 2)

tests/libdrgn.py

@@ -7,7 +7,6 @@ from enum import auto
 import os
 
 import _drgn
-import drgn
 
 _drgn_pydll = ctypes.PyDLL(_drgn.__file__)
 _drgn_cdll = ctypes.CDLL(_drgn.__file__)

tests/test_dwarf.py

@@ -6,7 +6,6 @@ import operator
 import os.path
 import re
 import tempfile
-import unittest
 
 import drgn
 from drgn import (
@@ -1025,7 +1024,8 @@ class TestTypes(TestCase):
             ),
         ]
 
-        point_type = lambda prog: prog.struct_type(
+        def point_type(prog):
+            return prog.struct_type(
                 "point",
                 8,
                 (
@@ -1033,7 +1033,9 @@ class TestTypes(TestCase):
                     TypeMember(prog.int_type("int", 4, True), "y", 32),
                 ),
             )
-        other_point_type = lambda prog: prog.struct_type(
+
+        def other_point_type(prog):
+            return prog.struct_type(
                 "point",
                 8,
                 (

tests/test_object.py

@@ -11,7 +11,6 @@ from drgn import (
     ObjectAbsentError,
     OutOfBoundsError,
     Qualifiers,
-    Type,
     TypeMember,
     cast,
     reinterpret,

tests/test_type.py

@@ -1,8 +1,6 @@
 # Copyright (c) Facebook, Inc. and its affiliates.
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-import operator
-
 from drgn import (
     Language,
     Object,

tools/bpf_inspect.py

@@ -2,13 +2,7 @@
 # Copyright (c) Facebook, Inc. and its affiliates.
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-DESCRIPTION = """
-drgn script to list BPF programs or maps and their properties
-unavailable via kernel API.
-"""
-
 import argparse
-import sys
 
 from drgn.helpers import enum_type_to_class
 from drgn.helpers.linux import bpf_map_for_each, bpf_prog_for_each, hlist_for_each_entry
@@ -116,7 +110,7 @@ def list_bpf_maps(args):
 
 def main():
     parser = argparse.ArgumentParser(
-        description=DESCRIPTION, formatter_class=argparse.RawTextHelpFormatter
+        description="drgn script to list BPF programs or maps and their properties unavailable via kernel API"
     )
 
     subparsers = parser.add_subparsers(title="subcommands", dest="subcommand")

vmtest/download.py

@@ -27,7 +27,7 @@ VMTEST_GITHUB_RELEASE = ("osandov", "drgn", "vmtest-assets")
 def available_kernel_releases(
     github_release: Dict[str, Any], arch: str
 ) -> Dict[str, Dict[str, Any]]:
-    pattern = re.compile(r"kernel-(.*)\." + re.escape(arch) + "\.tar\.zst")
+    pattern = re.compile(r"kernel-(.*)\." + re.escape(arch) + r"\.tar\.zst")
     releases = {}
     for asset in github_release["assets"]:
         match = pattern.fullmatch(asset["name"])

vmtest/manage.py

@@ -87,7 +87,7 @@ async def fetch_kernel_tags(kernel_dir: Path, kernel_tags: Sequence[str]) -> Non
     mainline_tags = []
     stable_tags = []
     for tag in kernel_tags:
-        if re.fullmatch("v[0-9]+\.[0-9]+\.[0-9]+", tag):
+        if re.fullmatch(r"v[0-9]+\.[0-9]+\.[0-9]+", tag):
             stable_tags.append(tag)
         else:
             mainline_tags.append(tag)

vmtest/vm.py

@@ -162,7 +162,7 @@ class LostVMError(Exception):
 
 def run_in_vm(command: str, kernel_dir: Path, build_dir: Path) -> int:
     match = re.search(
-        "QEMU emulator version ([0-9]+(?:\.[0-9]+)*)",
+        r"QEMU emulator version ([0-9]+(?:\.[0-9]+)*)",
         subprocess.check_output(
             ["qemu-system-x86_64", "-version"], universal_newlines=True
         ),
@@ -238,7 +238,7 @@ def run_in_vm(command: str, kernel_dir: Path, build_dir: Path) -> int:
                 # fmt: on
             ],
             env=env,
-        ) as qemu:
+        ):
             server_sock.settimeout(5)
             try:
                 sock = server_sock.accept()[0]