ruff: Fix PYI019 Use Self instead of custom TypeVar.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/data_import/slack.py

@@ -12,7 +12,7 @@ from collections import defaultdict
 from collections.abc import Iterator
 from datetime import datetime, timezone
 from email.headerregistry import Address
-from typing import Any, TypeAlias, TypeVar
+from typing import Any, TypeAlias
 from urllib.parse import SplitResult, urlsplit
 
 import orjson
@@ -68,8 +68,6 @@ AddedChannelsT: TypeAlias = dict[str, tuple[str, int]]
 AddedMPIMsT: TypeAlias = dict[str, tuple[str, int]]
 DMMembersT: TypeAlias = dict[str, tuple[str, str]]
 SlackToZulipRecipientT: TypeAlias = dict[str, int]
-# Generic type for SlackBotEmail class
-SlackBotEmailT = TypeVar("SlackBotEmailT", bound="SlackBotEmail")
 
 # We can look up unicode codepoints for Slack emoji using iamcal emoji
 # data. https://emojipedia.org/slack/, documents Slack's emoji names
@@ -106,7 +104,7 @@ class SlackBotEmail:
     assigned_email: dict[str, str] = {}
 
     @classmethod
-    def get_email(cls: type[SlackBotEmailT], user_profile: ZerverFieldsT, domain_name: str) -> str:
+    def get_email(cls, user_profile: ZerverFieldsT, domain_name: str) -> str:
         slack_bot_id = user_profile["bot_id"]
         if slack_bot_id in cls.assigned_email:
             return cls.assigned_email[slack_bot_id]

zerver/lib/thumbnail.py

@@ -4,13 +4,12 @@ import re
 from collections.abc import Iterator
 from contextlib import contextmanager
 from dataclasses import dataclass
-from typing import TypeVar
 
 import pyvips
 from bs4 import BeautifulSoup
 from bs4.formatter import EntitySubstitution, HTMLFormatter
 from django.utils.translation import gettext as _
-from typing_extensions import override
+from typing_extensions import Self, override
 
 from zerver.lib.exceptions import ErrorCode, JsonableError
 from zerver.lib.mime_types import INLINE_MIME_TYPES
@@ -30,8 +29,6 @@ IMAGE_MAX_ANIMATED_PIXELS = IMAGE_BOMB_TOTAL_PIXELS / 3
 # Reject emoji which, after resizing, have stills larger than this
 MAX_EMOJI_GIF_FILE_SIZE_BYTES = 128 * 1024  # 128 kb
 
-T = TypeVar("T", bound="BaseThumbnailFormat")
-
 
 @dataclass(frozen=True)
 class BaseThumbnailFormat:
@@ -52,7 +49,7 @@ class BaseThumbnailFormat:
         return f"{self.max_width}x{self.max_height}{animated}.{self.extension}"
 
     @classmethod
-    def from_string(cls: type[T], format_string: str) -> T | None:
+    def from_string(cls, format_string: str) -> Self | None:
         format_parts = re.match(r"(\d+)x(\d+)(-anim)?\.(\w+)$", format_string)
         if format_parts is None:
             return None