drop support for python 3.7

src/flask/app.py

@@ -1,7 +1,5 @@
 from __future__ import annotations
 
-import functools
-import inspect
 import logging
 import os
 import sys
@@ -9,6 +7,7 @@ import typing as t
 import weakref
 from collections.abc import Iterator as _abc_Iterator
 from datetime import timedelta
+from inspect import iscoroutinefunction
 from itertools import chain
 from types import TracebackType
 from urllib.parse import quote as _url_quote
@@ -70,7 +69,6 @@ from .wrappers import Request
 from .wrappers import Response
 
 if t.TYPE_CHECKING:  # pragma: no cover
-    import typing_extensions as te
     from .blueprints import Blueprint
     from .testing import FlaskClient
     from .testing import FlaskCliRunner
@@ -83,19 +81,6 @@ T_template_filter = t.TypeVar("T_template_filter", bound=ft.TemplateFilterCallab
 T_template_global = t.TypeVar("T_template_global", bound=ft.TemplateGlobalCallable)
 T_template_test = t.TypeVar("T_template_test", bound=ft.TemplateTestCallable)
 
-if sys.version_info >= (3, 8):
-    iscoroutinefunction = inspect.iscoroutinefunction
-else:
-
-    def iscoroutinefunction(func: t.Any) -> bool:
-        while inspect.ismethod(func):
-            func = func.__func__
-
-        while isinstance(func, functools.partial):
-            func = func.func
-
-        return inspect.iscoroutinefunction(func)
-
 
 def _make_timedelta(value: timedelta | int | None) -> timedelta | None:
     if value is None or isinstance(value, timedelta):
@@ -1430,7 +1415,7 @@ class Flask(Scaffold):
             f"Exception on {request.path} [{request.method}]", exc_info=exc_info
         )
 
-    def raise_routing_exception(self, request: Request) -> te.NoReturn:
+    def raise_routing_exception(self, request: Request) -> t.NoReturn:
         """Intercept routing exceptions and possibly do something else.
 
         In debug mode, intercept a routing redirect and replace it with

src/flask/helpers.py

@@ -25,7 +25,6 @@ from .signals import message_flashed
 if t.TYPE_CHECKING:  # pragma: no cover
     from werkzeug.wrappers import Response as BaseResponse
     from .wrappers import Response
-    import typing_extensions as te
 
 
 def get_debug_flag() -> bool:
@@ -257,7 +256,7 @@ def redirect(
     return _wz_redirect(location, code=code, Response=Response)
 
 
-def abort(code: int | BaseResponse, *args: t.Any, **kwargs: t.Any) -> te.NoReturn:
+def abort(code: int | BaseResponse, *args: t.Any, **kwargs: t.Any) -> t.NoReturn:
     """Raise an :exc:`~werkzeug.exceptions.HTTPException` for the given
     status code.
 

src/flask/sessions.py

@@ -13,7 +13,6 @@ from werkzeug.datastructures import CallbackDict
 from .json.tag import TaggedJSONSerializer
 
 if t.TYPE_CHECKING:  # pragma: no cover
-    import typing_extensions as te
     from .app import Flask
     from .wrappers import Request, Response
 
@@ -94,7 +93,7 @@ class NullSession(SecureCookieSession):
     but fail on setting.
     """
 
-    def _fail(self, *args: t.Any, **kwargs: t.Any) -> te.NoReturn:
+    def _fail(self, *args: t.Any, **kwargs: t.Any) -> t.NoReturn:
         raise RuntimeError(
             "The session is unavailable because no secret "
             "key was set.  Set the secret_key on the "