fix: importing Self from typing_extensions

pyproject.toml

@@ -7,7 +7,7 @@ dependencies = [
 ]
 license = {text = "BSD-3-Clause"}
 dynamic = ["version"]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 readme = "README.rst"
 classifiers = [
   "Development Status :: 4 - Beta",

src/mistune/__init__.py

@@ -8,10 +8,6 @@
     Documentation: https://mistune.lepture.com/
 """
 
-try:
-    import typing_extensions
-except ImportError:
-    pass
 from typing import Any, Dict, Iterable, List, Optional, Tuple, Union, Literal
 from .block_parser import BlockParser
 from .core import BaseRenderer, BlockState, InlineState

src/mistune/core.py

@@ -14,9 +14,12 @@
     Type,
     TypeVar,
     Union,
-    Self,
     cast,
 )
+try:
+    from typing import Self
+except ImportError:
+    from typing_extensions import Self
 
 _LINE_END = re.compile(r'\n|$')