From: Ben Darnell <ben@bendarnell.com>
Date: Thu, 13 Jun 2024 17:51:48 +0000 (-0400)
Subject: *: Remove redundant (object) base classes
X-Git-Tag: v6.5.0b1~47^2~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04ebadd87ded3588c868dcfeb0cc8aeb19e039c7;p=thirdparty%2Ftornado.git

*: Remove redundant (object) base classes

This was only necessary in python 3.

This change was made with a version of pyupgrade that was modified
to perform only this change.
---

diff --git a/demos/chat/chatdemo.py b/demos/chat/chatdemo.py
index 28c12108f..8cc6f65aa 100755
--- a/demos/chat/chatdemo.py
+++ b/demos/chat/chatdemo.py
@@ -25,7 +25,7 @@ define("port", default=8888, help="run on the given port", type=int)
 define("debug", default=True, help="run in debug mode")
 
 
-class MessageBuffer(object):
+class MessageBuffer:
     def __init__(self):
         # cond is notified whenever the message cache is updated
         self.cond = tornado.locks.Condition()
diff --git a/tornado/auth.py b/tornado/auth.py
index 2f115f576..0a98beb27 100644
--- a/tornado/auth.py
+++ b/tornado/auth.py
@@ -91,7 +91,7 @@ class AuthError(Exception):
     pass
 
 
-class OpenIdMixin(object):
+class OpenIdMixin:
     """Abstract implementation of OpenID and Attribute Exchange.
 
     Class attributes:
@@ -284,7 +284,7 @@ class OpenIdMixin(object):
         return httpclient.AsyncHTTPClient()
 
 
-class OAuthMixin(object):
+class OAuthMixin:
     """Abstract implementation of OAuth 1.0 and 1.0a.
 
     See `TwitterMixin` below for an example implementation.
@@ -552,7 +552,7 @@ class OAuthMixin(object):
         return httpclient.AsyncHTTPClient()
 
 
-class OAuth2Mixin(object):
+class OAuth2Mixin:
     """Abstract implementation of OAuth 2.0.
 
     See `FacebookGraphMixin` or `GoogleOAuth2Mixin` below for example
diff --git a/tornado/gen.py b/tornado/gen.py
index 7d8747748..1eb5e7984 100644
--- a/tornado/gen.py
+++ b/tornado/gen.py
@@ -300,7 +300,7 @@ class Return(Exception):
         self.args = (value,)
 
 
-class WaitIterator(object):
+class WaitIterator:
     """Provides an iterator to yield the results of awaitables as they finish.
 
     Yielding a set of awaitables like this:
@@ -668,7 +668,7 @@ def sleep(duration: float) -> "Future[None]":
     return f
 
 
-class _NullFuture(object):
+class _NullFuture:
     """_NullFuture resembles a Future that finished with a result of None.
 
     It's not actually a `Future` to avoid depending on a particular event loop.
@@ -713,7 +713,7 @@ In native coroutines, the equivalent of ``yield gen.moment`` is
 """
 
 
-class Runner(object):
+class Runner:
     """Internal implementation of `tornado.gen.coroutine`.
 
     Maintains information about pending callbacks and their results.
diff --git a/tornado/http1connection.py b/tornado/http1connection.py
index 1a23f5c7f..53cfca968 100644
--- a/tornado/http1connection.py
+++ b/tornado/http1connection.py
@@ -46,7 +46,7 @@ class _QuietException(Exception):
         pass
 
 
-class _ExceptionLoggingContext(object):
+class _ExceptionLoggingContext:
     """Used with the ``with`` statement when calling delegate methods to
     log any exceptions with the given logger.  Any exceptions caught are
     converted to _QuietException
@@ -70,7 +70,7 @@ class _ExceptionLoggingContext(object):
             raise _QuietException
 
 
-class HTTP1ConnectionParameters(object):
+class HTTP1ConnectionParameters:
     """Parameters for `.HTTP1Connection` and `.HTTP1ServerConnection`."""
 
     def __init__(
@@ -761,7 +761,7 @@ class _GzipMessageDelegate(httputil.HTTPMessageDelegate):
         return self._delegate.on_connection_close()
 
 
-class HTTP1ServerConnection(object):
+class HTTP1ServerConnection:
     """An HTTP/1.x server."""
 
     def __init__(
diff --git a/tornado/httpclient.py b/tornado/httpclient.py
index 3011c371b..b26ed449e 100644
--- a/tornado/httpclient.py
+++ b/tornado/httpclient.py
@@ -56,7 +56,7 @@ from tornado.util import Configurable
 from typing import Type, Any, Union, Dict, Callable, Optional, cast
 
 
-class HTTPClient(object):
+class HTTPClient:
     """A blocking HTTP client.
 
     This interface is provided to make it easier to share code between
@@ -336,7 +336,7 @@ class AsyncHTTPClient(Configurable):
         super(AsyncHTTPClient, cls).configure(impl, **kwargs)
 
 
-class HTTPRequest(object):
+class HTTPRequest:
     """HTTP client request object."""
 
     _headers = None  # type: Union[Dict[str, str], httputil.HTTPHeaders]
@@ -571,7 +571,7 @@ class HTTPRequest(object):
         self._body = utf8(value)
 
 
-class HTTPResponse(object):
+class HTTPResponse:
     """HTTP Response object.
 
     Attributes:
@@ -732,7 +732,7 @@ class HTTPClientError(Exception):
 HTTPError = HTTPClientError
 
 
-class _RequestProxy(object):
+class _RequestProxy:
     """Combines an object with a dictionary of defaults.
 
     Used internally by AsyncHTTPClient implementations.
diff --git a/tornado/httpserver.py b/tornado/httpserver.py
index 757f711b2..58c74e472 100644
--- a/tornado/httpserver.py
+++ b/tornado/httpserver.py
@@ -295,7 +295,7 @@ class _CallableAdapter(httputil.HTTPMessageDelegate):
         del self._chunks
 
 
-class _HTTPRequestContext(object):
+class _HTTPRequestContext:
     def __init__(
         self,
         stream: iostream.IOStream,
diff --git a/tornado/httputil.py b/tornado/httputil.py
index e2e51dfa1..ecd53742c 100644
--- a/tornado/httputil.py
+++ b/tornado/httputil.py
@@ -253,7 +253,7 @@ class HTTPHeaders(StrMutableMapping):
     __unicode__ = __str__
 
 
-class HTTPServerRequest(object):
+class HTTPServerRequest:
     """A single HTTP request.
 
     All attributes are type `str` unless otherwise noted.
@@ -494,7 +494,7 @@ class HTTPOutputError(Exception):
     pass
 
 
-class HTTPServerConnectionDelegate(object):
+class HTTPServerConnectionDelegate:
     """Implement this interface to handle requests from `.HTTPServer`.
 
     .. versionadded:: 4.0
@@ -523,7 +523,7 @@ class HTTPServerConnectionDelegate(object):
         pass
 
 
-class HTTPMessageDelegate(object):
+class HTTPMessageDelegate:
     """Implement this interface to handle an HTTP request or response.
 
     .. versionadded:: 4.0
@@ -569,7 +569,7 @@ class HTTPMessageDelegate(object):
         pass
 
 
-class HTTPConnection(object):
+class HTTPConnection:
     """Applications use this interface to write their responses.
 
     .. versionadded:: 4.0
diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 5a880b0cd..612aac3e8 100644
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -819,7 +819,7 @@ class IOLoop(Configurable):
         self._pending_tasks.discard(f)
 
 
-class _Timeout(object):
+class _Timeout:
     """An IOLoop timeout, a UNIX timestamp and a callback"""
 
     # Reduce memory overhead when there are lots of pending callbacks
@@ -848,7 +848,7 @@ class _Timeout(object):
         return self.tdeadline <= other.tdeadline
 
 
-class PeriodicCallback(object):
+class PeriodicCallback:
     """Schedules the given callback to be called periodically.
 
     The callback is called every ``callback_time`` milliseconds when
diff --git a/tornado/iostream.py b/tornado/iostream.py
index e3956c4d1..a8955148f 100644
--- a/tornado/iostream.py
+++ b/tornado/iostream.py
@@ -114,7 +114,7 @@ class StreamBufferFullError(Exception):
     """Exception raised by `IOStream` methods when the buffer is full."""
 
 
-class _StreamBuffer(object):
+class _StreamBuffer:
     """
     A specialized buffer that tries to avoid copies when large pieces
     of data are encountered.
@@ -204,7 +204,7 @@ class _StreamBuffer(object):
         self._first_pos = pos
 
 
-class BaseIOStream(object):
+class BaseIOStream:
     """A utility class to write to and read from a non-blocking file or socket.
 
     We support a non-blocking ``write()`` and a family of ``read_*()``
diff --git a/tornado/locale.py b/tornado/locale.py
index c5526703b..3fb1a6861 100644
--- a/tornado/locale.py
+++ b/tornado/locale.py
@@ -221,7 +221,7 @@ def get_supported_locales() -> Iterable[str]:
     return _supported_locales
 
 
-class Locale(object):
+class Locale:
     """Object representing a locale.
 
     After calling one of `load_translations` or `load_gettext_translations`,
diff --git a/tornado/locks.py b/tornado/locks.py
index 1bcec1b3a..6d794687d 100644
--- a/tornado/locks.py
+++ b/tornado/locks.py
@@ -28,7 +28,7 @@ if typing.TYPE_CHECKING:
 __all__ = ["Condition", "Event", "Semaphore", "BoundedSemaphore", "Lock"]
 
 
-class _TimeoutGarbageCollector(object):
+class _TimeoutGarbageCollector:
     """Base class for objects that periodically clean up timed-out waiters.
 
     Avoids memory leak in a common pattern like:
@@ -155,7 +155,7 @@ class Condition(_TimeoutGarbageCollector):
         self.notify(len(self._waiters))
 
 
-class Event(object):
+class Event:
     """An event blocks coroutines until its internal flag is set to True.
 
     Similar to `threading.Event`.
@@ -255,7 +255,7 @@ class Event(object):
             return timeout_fut
 
 
-class _ReleasingContextManager(object):
+class _ReleasingContextManager:
     """Releases a Lock or Semaphore at the end of a "with" statement.
 
     with (yield semaphore.acquire()):
@@ -484,7 +484,7 @@ class BoundedSemaphore(Semaphore):
         super().release()
 
 
-class Lock(object):
+class Lock:
     """A lock for coroutines.
 
     A Lock begins unlocked, and `acquire` locks it immediately. While it is
diff --git a/tornado/options.py b/tornado/options.py
index cb66b7711..46c740b58 100644
--- a/tornado/options.py
+++ b/tornado/options.py
@@ -130,7 +130,7 @@ class Error(Exception):
     pass
 
 
-class OptionParser(object):
+class OptionParser:
     """A collection of options, a dictionary with object-like access.
 
     Normally accessed via static functions in the `tornado.options` module,
@@ -498,7 +498,7 @@ class OptionParser(object):
         return _Mockable(self)
 
 
-class _Mockable(object):
+class _Mockable:
     """`mock.patch` compatible wrapper for `OptionParser`.
 
     As of ``mock`` version 1.0.1, when an object uses ``__getattr__``
@@ -528,7 +528,7 @@ class _Mockable(object):
         setattr(self._options, name, self._originals.pop(name))
 
 
-class _Option(object):
+class _Option:
     # This class could almost be made generic, but the way the types
     # interact with the multiple argument makes this tricky. (default
     # and the callback use List[T], but type is still Type[T]).
diff --git a/tornado/process.py b/tornado/process.py
index 12e3eb648..339ef659b 100644
--- a/tornado/process.py
+++ b/tornado/process.py
@@ -185,7 +185,7 @@ def task_id() -> Optional[int]:
     return _task_id
 
 
-class Subprocess(object):
+class Subprocess:
     """Wraps ``subprocess.Popen`` with IOStream support.
 
     The constructor is the same as ``subprocess.Popen`` with the following
diff --git a/tornado/routing.py b/tornado/routing.py
index a145d7191..607e9f1d7 100644
--- a/tornado/routing.py
+++ b/tornado/routing.py
@@ -438,7 +438,7 @@ class ReversibleRuleRouter(ReversibleRouter, RuleRouter):
         return None
 
 
-class Rule(object):
+class Rule:
     """A routing rule."""
 
     def __init__(
@@ -487,7 +487,7 @@ class Rule(object):
         )
 
 
-class Matcher(object):
+class Matcher:
     """Represents a matcher for request features."""
 
     def match(self, request: httputil.HTTPServerRequest) -> Optional[Dict[str, Any]]:
diff --git a/tornado/tcpclient.py b/tornado/tcpclient.py
index 0a829062e..0971ac084 100644
--- a/tornado/tcpclient.py
+++ b/tornado/tcpclient.py
@@ -38,7 +38,7 @@ if typing.TYPE_CHECKING:
 _INITIAL_CONNECT_TIMEOUT = 0.3
 
 
-class _Connector(object):
+class _Connector:
     """A stateless implementation of the "Happy Eyeballs" algorithm.
 
     "Happy Eyeballs" is documented in RFC6555 as the recommended practice
@@ -199,7 +199,7 @@ class _Connector(object):
             stream.close()
 
 
-class TCPClient(object):
+class TCPClient:
     """A non-blocking TCP connection factory.
 
     .. versionchanged:: 5.0
diff --git a/tornado/tcpserver.py b/tornado/tcpserver.py
index 02c0ca0cc..4b84af311 100644
--- a/tornado/tcpserver.py
+++ b/tornado/tcpserver.py
@@ -40,7 +40,7 @@ if typing.TYPE_CHECKING:
     from typing import Callable, List  # noqa: F401
 
 
-class TCPServer(object):
+class TCPServer:
     r"""A non-blocking, single-threaded TCP server.
 
     To use `TCPServer`, define a subclass which overrides the `handle_stream`
diff --git a/tornado/template.py b/tornado/template.py
index 2340cdbef..e8be9064f 100644
--- a/tornado/template.py
+++ b/tornado/template.py
@@ -249,7 +249,7 @@ def filter_whitespace(mode: str, text: str) -> str:
         raise Exception("invalid whitespace mode %s" % mode)
 
 
-class Template(object):
+class Template:
     """A compiled template.
 
     We compile into Python from the given template_string. You can generate
@@ -389,7 +389,7 @@ class Template(object):
         return ancestors
 
 
-class BaseLoader(object):
+class BaseLoader:
     """Base class for template loaders.
 
     You must use a template loader to use template constructs like
@@ -500,7 +500,7 @@ class DictLoader(BaseLoader):
         return Template(self.dict[name], name=name, loader=self)
 
 
-class _Node(object):
+class _Node:
     def each_child(self) -> Iterable["_Node"]:
         return ()
 
@@ -720,7 +720,7 @@ class ParseError(Exception):
         return "%s at %s:%d" % (self.message, self.filename, self.lineno)
 
 
-class _CodeWriter(object):
+class _CodeWriter:
     def __init__(
         self,
         file: TextIO,
@@ -740,7 +740,7 @@ class _CodeWriter(object):
         return self._indent
 
     def indent(self) -> "ContextManager":
-        class Indenter(object):
+        class Indenter:
             def __enter__(_) -> "_CodeWriter":
                 self._indent += 1
                 return self
@@ -755,7 +755,7 @@ class _CodeWriter(object):
         self.include_stack.append((self.current_template, line))
         self.current_template = template
 
-        class IncludeTemplate(object):
+        class IncludeTemplate:
             def __enter__(_) -> "_CodeWriter":
                 return self
 
@@ -778,7 +778,7 @@ class _CodeWriter(object):
         print("    " * indent + line + line_comment, file=self.file)
 
 
-class _TemplateReader(object):
+class _TemplateReader:
     def __init__(self, name: str, text: str, whitespace: str) -> None:
         self.name = name
         self.text = text
diff --git a/tornado/test/circlerefs_test.py b/tornado/test/circlerefs_test.py
index 5c25adffd..d5f7e9692 100644
--- a/tornado/test/circlerefs_test.py
+++ b/tornado/test/circlerefs_test.py
@@ -105,7 +105,7 @@ def assert_no_cycle_garbage():
 class CircleRefsTest(unittest.TestCase):
     def test_known_leak(self):
         # Construct a known leak scenario to make sure the test harness works.
-        class C(object):
+        class C:
             def __init__(self, name):
                 self.name = name
                 self.a: typing.Optional[C] = None
@@ -199,7 +199,7 @@ class CircleRefsTest(unittest.TestCase):
 
         with concurrent.futures.ThreadPoolExecutor(1) as thread_pool:
 
-            class Factory(object):
+            class Factory:
                 executor = thread_pool
 
                 @tornado.concurrent.run_on_executor
diff --git a/tornado/test/concurrent_test.py b/tornado/test/concurrent_test.py
index 009d6ed43..ea20ed36a 100644
--- a/tornado/test/concurrent_test.py
+++ b/tornado/test/concurrent_test.py
@@ -94,7 +94,7 @@ class CapError(Exception):
     pass
 
 
-class BaseCapClient(object):
+class BaseCapClient:
     def __init__(self, port):
         self.port = port
 
@@ -124,7 +124,7 @@ class GeneratorCapClient(BaseCapClient):
         raise gen.Return(self.process_response(data))
 
 
-class ClientTestMixin(object):
+class ClientTestMixin:
     client_class = None  # type: typing.Callable
 
     def setUp(self):
@@ -174,7 +174,7 @@ class GeneratorClientTest(ClientTestMixin, AsyncTestCase):
 class RunOnExecutorTest(AsyncTestCase):
     @gen_test
     def test_no_calling(self):
-        class Object(object):
+        class Object:
             def __init__(self):
                 self.executor = futures.thread.ThreadPoolExecutor(1)
 
@@ -188,7 +188,7 @@ class RunOnExecutorTest(AsyncTestCase):
 
     @gen_test
     def test_call_with_no_args(self):
-        class Object(object):
+        class Object:
             def __init__(self):
                 self.executor = futures.thread.ThreadPoolExecutor(1)
 
@@ -202,7 +202,7 @@ class RunOnExecutorTest(AsyncTestCase):
 
     @gen_test
     def test_call_with_executor(self):
-        class Object(object):
+        class Object:
             def __init__(self):
                 self.__executor = futures.thread.ThreadPoolExecutor(1)
 
@@ -216,7 +216,7 @@ class RunOnExecutorTest(AsyncTestCase):
 
     @gen_test
     def test_async_await(self):
-        class Object(object):
+        class Object:
             def __init__(self):
                 self.executor = futures.thread.ThreadPoolExecutor(1)
 
diff --git a/tornado/test/gen_test.py b/tornado/test/gen_test.py
index b49563656..3190ef40f 100644
--- a/tornado/test/gen_test.py
+++ b/tornado/test/gen_test.py
@@ -581,7 +581,7 @@ class GenCoroutineTest(AsyncTestCase):
         # without waiting for garbage collection.
         @gen.coroutine
         def inner():
-            class Foo(object):
+            class Foo:
                 pass
 
             local_var = Foo()
diff --git a/tornado/test/httpserver_test.py b/tornado/test/httpserver_test.py
index 762c23f6e..07244634a 100644
--- a/tornado/test/httpserver_test.py
+++ b/tornado/test/httpserver_test.py
@@ -115,7 +115,7 @@ class BaseSSLTest(AsyncHTTPSTestCase):
         return Application([("/", HelloWorldRequestHandler, dict(protocol="https"))])
 
 
-class SSLTestMixin(object):
+class SSLTestMixin:
     def get_ssl_options(self):
         return dict(
             ssl_version=self.get_ssl_version(),
diff --git a/tornado/test/ioloop_test.py b/tornado/test/ioloop_test.py
index 07a7cf0c3..212393928 100644
--- a/tornado/test/ioloop_test.py
+++ b/tornado/test/ioloop_test.py
@@ -265,7 +265,7 @@ class TestIOLoop(AsyncTestCase):
         # Use a socket since they are supported by IOLoop on all platforms.
         # Unfortunately, sockets don't support the .closed attribute for
         # inspecting their close status, so we must use a wrapper.
-        class SocketWrapper(object):
+        class SocketWrapper:
             def __init__(self, sockobj):
                 self.sockobj = sockobj
                 self.closed = False
diff --git a/tornado/test/iostream_test.py b/tornado/test/iostream_test.py
index 096dfa868..a7d415fbf 100644
--- a/tornado/test/iostream_test.py
+++ b/tornado/test/iostream_test.py
@@ -57,7 +57,7 @@ class HelloHandler(RequestHandler):
         self.write("Hello")
 
 
-class TestIOStreamWebMixin(object):
+class TestIOStreamWebMixin:
     def _make_client_iostream(self):
         raise NotImplementedError()
 
@@ -177,7 +177,7 @@ class TestIOStreamWebMixin(object):
             stream.read_bytes(1)
 
 
-class TestReadWriteMixin(object):
+class TestReadWriteMixin:
     # Tests where one stream reads and the other writes.
     # These should work for BaseIOStream implementations.
 
diff --git a/tornado/test/netutil_test.py b/tornado/test/netutil_test.py
index 33a8b7dba..0f0bb2a91 100644
--- a/tornado/test/netutil_test.py
+++ b/tornado/test/netutil_test.py
@@ -30,7 +30,7 @@ else:
     from tornado.platform.caresresolver import CaresResolver
 
 
-class _ResolverTestMixin(object):
+class _ResolverTestMixin:
     resolver = None  # type: typing.Any
 
     @gen_test
@@ -48,7 +48,7 @@ class _ResolverTestMixin(object):
 
 # It is impossible to quickly and consistently generate an error in name
 # resolution, so test this case separately, using mocks as needed.
-class _ResolverErrorTestMixin(object):
+class _ResolverErrorTestMixin:
     resolver = None  # type: typing.Any
 
     @gen_test
diff --git a/tornado/test/options_test.py b/tornado/test/options_test.py
index 6f4021c68..3ad1a9d9e 100644
--- a/tornado/test/options_test.py
+++ b/tornado/test/options_test.py
@@ -15,7 +15,7 @@ if typing.TYPE_CHECKING:
     from typing import List  # noqa: F401
 
 
-class Email(object):
+class Email:
     def __init__(self, value):
         if isinstance(value, str) and "@" in value:
             self._value = value
diff --git a/tornado/test/simple_httpclient_test.py b/tornado/test/simple_httpclient_test.py
index 50fdcb153..7ee524553 100644
--- a/tornado/test/simple_httpclient_test.py
+++ b/tornado/test/simple_httpclient_test.py
@@ -142,7 +142,7 @@ class RespondInPrepareHandler(RequestHandler):
         self.finish("forbidden")
 
 
-class SimpleHTTPClientTestMixin(object):
+class SimpleHTTPClientTestMixin:
     def create_client(self, **kwargs):
         raise NotImplementedError()
 
diff --git a/tornado/test/tcpclient_test.py b/tornado/test/tcpclient_test.py
index 7116d2777..2973d248d 100644
--- a/tornado/test/tcpclient_test.py
+++ b/tornado/test/tcpclient_test.py
@@ -197,7 +197,7 @@ class TestConnectorSplit(unittest.TestCase):
 
 
 class ConnectorTest(AsyncTestCase):
-    class FakeStream(object):
+    class FakeStream:
         def __init__(self):
             self.closed = False
 
diff --git a/tornado/test/web_test.py b/tornado/test/web_test.py
index 351a2a897..c65e60541 100644
--- a/tornado/test/web_test.py
+++ b/tornado/test/web_test.py
@@ -2422,7 +2422,7 @@ class BaseFlowControlHandler(RequestHandler):
         self.write(dict(methods=self.methods))
 
 
-class BaseStreamingRequestFlowControlTest(object):
+class BaseStreamingRequestFlowControlTest:
     def get_httpserver_options(self):
         # Use a small chunk size so flow control is relevant even though
         # all the data arrives at once.
diff --git a/tornado/test/websocket_test.py b/tornado/test/websocket_test.py
index 8a3ac7125..e7228ee82 100644
--- a/tornado/test/websocket_test.py
+++ b/tornado/test/websocket_test.py
@@ -661,7 +661,7 @@ class WebSocketNativeCoroutineTest(WebSocketBaseTestCase):
         self.assertEqual(res, "hello2")
 
 
-class CompressionTestMixin(object):
+class CompressionTestMixin:
     MESSAGE = "Hello world. Testing 123 123"
 
     def get_app(self):
@@ -766,7 +766,7 @@ class DefaultCompressionTest(CompressionTestMixin, WebSocketBaseTestCase):
         self.assertEqual(bytes_out, bytes_in + 12)
 
 
-class MaskFunctionMixin(object):
+class MaskFunctionMixin:
     # Subclasses should define self.mask(mask, data)
     def mask(self, mask: bytes, data: bytes) -> bytes:
         raise NotImplementedError()
diff --git a/tornado/util.py b/tornado/util.py
index 1fc2c69a5..bf907b336 100644
--- a/tornado/util.py
+++ b/tornado/util.py
@@ -65,7 +65,7 @@ class ObjectDict(Dict[str, Any]):
         self[name] = value
 
 
-class GzipDecompressor(object):
+class GzipDecompressor:
     """Streaming gzip decompressor.
 
     The interface is like that of `zlib.decompressobj` (without some of the
@@ -201,7 +201,7 @@ def re_unescape(s: str) -> str:
     return _re_unescape_pattern.sub(_re_unescape_replacement, s)
 
 
-class Configurable(object):
+class Configurable:
     """Base class for configurable interfaces.
 
     A configurable interface is an (abstract) class whose constructor
@@ -336,7 +336,7 @@ class Configurable(object):
         base.__impl_kwargs = saved[1]
 
 
-class ArgReplacer(object):
+class ArgReplacer:
     """Replaces one value in an ``args, kwargs`` pair.
 
     Inspects the function signature to find an argument by name
diff --git a/tornado/web.py b/tornado/web.py
index 30cef30bd..648bdc385 100644
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -176,7 +176,7 @@ class _ArgDefaultMarker:
 _ARG_DEFAULT = _ArgDefaultMarker()
 
 
-class RequestHandler(object):
+class RequestHandler:
     """Base class for HTTP request handlers.
 
     Subclasses must define at least one of the methods defined in the
@@ -3187,7 +3187,7 @@ class FallbackHandler(RequestHandler):
         self.on_finish()
 
 
-class OutputTransform(object):
+class OutputTransform:
     """A transform modifies the result of an HTTP request (e.g., GZip encoding)
 
     Applications are not expected to create their own OutputTransforms
@@ -3339,7 +3339,7 @@ def authenticated(
     return wrapper
 
 
-class UIModule(object):
+class UIModule:
     """A re-usable, modular UI unit on a page.
 
     UI modules often execute additional queries, and they can include
@@ -3487,7 +3487,7 @@ class TemplateModule(UIModule):
         return "".join(self._get_resources("html_body"))
 
 
-class _UIModuleNamespace(object):
+class _UIModuleNamespace:
     """Lazy namespace which creates UIModule proxies bound to a handler."""
 
     def __init__(
diff --git a/tornado/websocket.py b/tornado/websocket.py
index ad5db5590..7694c41b2 100644
--- a/tornado/websocket.py
+++ b/tornado/websocket.py
@@ -115,7 +115,7 @@ class _DecompressTooLargeError(Exception):
     pass
 
 
-class _WebSocketParams(object):
+class _WebSocketParams:
     def __init__(
         self,
         ping_interval: Optional[float] = None,
@@ -698,7 +698,7 @@ class WebSocketProtocol(abc.ABC):
         raise NotImplementedError()
 
 
-class _PerMessageDeflateCompressor(object):
+class _PerMessageDeflateCompressor:
     def __init__(
         self,
         persistent: bool,
@@ -746,7 +746,7 @@ class _PerMessageDeflateCompressor(object):
         return data[:-4]
 
 
-class _PerMessageDeflateDecompressor(object):
+class _PerMessageDeflateDecompressor:
     def __init__(
         self,
         persistent: bool,
diff --git a/tornado/wsgi.py b/tornado/wsgi.py
index 32641be30..8a08d56e7 100644
--- a/tornado/wsgi.py
+++ b/tornado/wsgi.py
@@ -56,7 +56,7 @@ def to_wsgi_str(s: bytes) -> str:
     return s.decode("latin1")
 
 
-class WSGIContainer(object):
+class WSGIContainer:
     r"""Makes a WSGI-compatible application runnable on Tornado's HTTP server.
 
     .. warning::