drop support for python 3.7

.github/workflows/tests.yaml

@@ -31,10 +31,9 @@ jobs:
           - {name: '3.10', python: '3.10', os: ubuntu-latest, tox: py310}
           - {name: '3.9', python: '3.9', os: ubuntu-latest, tox: py39}
           - {name: '3.8', python: '3.8', os: ubuntu-latest, tox: py38}
-          - {name: '3.7', python: '3.7', os: ubuntu-latest, tox: py37}
           - {name: 'PyPy', python: 'pypy-3.9', os: ubuntu-latest, tox: pypy39}
           - {name: 'Minimum Versions', python: '3.11', os: ubuntu-latest, tox: py311-min}
-          - {name: 'Development Versions', python: '3.7', os: ubuntu-latest, tox: py37-dev}
+          - {name: 'Development Versions', python: '3.8', os: ubuntu-latest, tox: py38-dev}
           - {name: Typing, python: '3.11', os: ubuntu-latest, tox: typing}
     steps:
       - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
     rev: v3.3.1
     hooks:
       - id: pyupgrade
-        args: ["--py37-plus"]
+        args: ["--py38-plus"]
   - repo: https://github.com/asottile/reorder_python_imports
     rev: v3.9.0
     hooks:

CHANGES.rst

@@ -3,6 +3,7 @@ Version 2.3.0
 
 Unreleased
 
+-   Drop support for Python 3.7. :pr:`5072`
 -   Remove previously deprecated code. :pr:`4995`
 
     -   The ``push`` and ``pop`` methods of the deprecated ``_app_ctx_stack`` and

docs/extensiondev.rst

@@ -293,9 +293,8 @@ ecosystem remain consistent and compatible.
     any particular version scheme, but should use lower bounds to
     indicate minimum compatibility support. For example,
     ``sqlalchemy>=1.4``.
-9.  Indicate the versions of Python supported using
-    ``python_requires=">=version"``. Flask itself supports Python >=3.7
-    as of December 2021, but this will update over time.
+9.  Indicate the versions of Python supported using ``python_requires=">=version"``.
+    Flask itself supports Python >=3.8 as of April 2023, but this will update over time.
 
 .. _PyPI: https://pypi.org/search/?c=Framework+%3A%3A+Flask
 .. _Discord Chat: https://discord.gg/pallets

docs/installation.rst

@@ -5,8 +5,7 @@ Installation
 Python Version
 --------------
 
-We recommend using the latest version of Python. Flask supports Python
-3.7 and newer.
+We recommend using the latest version of Python. Flask supports Python 3.8 and newer.
 
 
 Dependencies

examples/celery/pyproject.toml

@@ -3,7 +3,7 @@ name = "flask-example-celery"
 version = "1.0.0"
 description = "Example Flask application with Celery background tasks."
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 dependencies = ["flask>=2.2.2", "celery[redis]>=5.2.7"]
 
 [build-system]

pyproject.toml

@@ -18,7 +18,7 @@ classifiers = [
     "Topic :: Internet :: WWW/HTTP :: WSGI :: Application",
     "Topic :: Software Development :: Libraries :: Application Frameworks",
 ]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 dependencies = [
     "Werkzeug>=2.2.2",
     "Jinja2>=3.0",
@@ -67,7 +67,7 @@ source = ["flask", "tests"]
 source = ["src", "*/site-packages"]
 
 [tool.mypy]
-python_version = "3.7"
+python_version = "3.8"
 files = ["src/flask"]
 show_error_codes = true
 pretty = true

requirements/tests.in

@@ -1,4 +1,4 @@
 pytest
 asgiref
 greenlet ; python_version < "3.11"
-python-dotenv>=1; python_version >= "3.8"
+python-dotenv

requirements/tests.txt

@@ -1,4 +1,4 @@
-# SHA1:3c8dde35aba20388b22430b17974af8ef8205b4f
+# SHA1:42d37aff22e2f1fc447e20d483e13d6d4e066b10
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
@@ -15,5 +15,5 @@ pluggy==1.0.0
     # via pytest
 pytest==7.3.1
     # via -r requirements/tests.in
-python-dotenv==1.0.0 ; python_version >= "3.8"
+python-dotenv==1.0.0
     # via -r requirements/tests.in

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 "

tests/typing/typing_route.py

@@ -3,8 +3,6 @@ from __future__ import annotations
 import typing as t
 from http import HTTPStatus
 
-import typing_extensions as te
-
 from flask import Flask
 from flask import jsonify
 from flask import stream_template
@@ -40,7 +38,7 @@ def hello_json_list() -> t.List[t.Any]:
     return [{"message": "Hello"}, {"message": "World"}]
 
 
-class StatusJSON(te.TypedDict):
+class StatusJSON(t.TypedDict):
     status: str
 
 

tox.ini

@@ -1,9 +1,9 @@
 [tox]
 envlist =
-    py3{12,11,10,9,8,7}
+    py3{12,11,10,9,8}
     pypy39
     py311-min
-    py37-dev
+    py38-dev
     style
     typing
     docs