From 47a7eb1727552010d72c5ec3ba7a57c91e4a0b05 Mon Sep 17 00:00:00 2001
From: Paul Kehrer <paul.l.kehrer@gmail.com>
Date: Mon, 16 Sep 2024 14:53:23 -0700
Subject: [PATCH] deprecate 3.7

we don't have a timeline for removing support yet, but start warning
---
 CHANGELOG.rst                |  3 +++
 src/cryptography/__init__.py | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 75b4a55f78d33..b2e677dd219ce 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,9 @@ Changelog
 
 .. note:: This version is not yet released and is under active development.
 
+* Deprecated Python 3.7 support. Python 3.7 is no longer supported by the
+  Python core team. Support for Python 3.7 will be removed in a future
+  ``cryptography`` release.
 * Enforce the :rfc:`5280` requirement that extended key usage extensions must
   not be empty.
 * Added support for timestamp extraction to the
diff --git a/src/cryptography/__init__.py b/src/cryptography/__init__.py
index d374f752dfd53..66ca71dd12e5b 100644
--- a/src/cryptography/__init__.py
+++ b/src/cryptography/__init__.py
@@ -4,6 +4,9 @@
 
 from __future__ import annotations
 
+import sys
+import warnings
+
 from cryptography.__about__ import __author__, __copyright__, __version__
 
 __all__ = [
@@ -11,3 +14,12 @@
     "__copyright__",
     "__version__",
 ]
+
+if sys.version_info[:2] == (3, 7):
+    warnings.warn(
+        "Python 3.7 is no longer supported by the Python core team "
+        "and support for it is deprecated in cryptography. A future "
+        "release of cryptography will remove support for Python 3.7.",
+        CryptographyDeprecationWarning,
+        stacklevel=2,
+    )