Merge pull request #2520 from moj-analytical-services/maint/deprecate…

…-3-8

Deprecation warning for python 3.8

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Deprecated
+
+- Deprecated support for python `3.8.x` following end of support for that minor version ([#2520](https://github.com/moj-analytical-services/splink/pull/2520))
+
 ## [4.0.6] - 2024-12-05
 
 ### Added

splink/__init__.py

@@ -1,4 +1,6 @@
+from sys import version_info
 from typing import TYPE_CHECKING
+from warnings import warn
 
 from splink.internals.blocking_rule_library import block_on
 from splink.internals.column_expression import ColumnExpression
@@ -17,6 +19,19 @@
     from splink.internals.duckdb.database_api import DuckDBAPI
     from splink.internals.spark.database_api import SparkAPI
 
+if version_info.minor == 8:
+    warn(
+        (
+            "Python 3.8 has reached end-of-life.  "
+            "Future releases of Splink may no longer be compatible with "
+            "this python version.\n"
+            "Please consider upgrading your python version if you wish "
+            "to continue to be able to install the latest version of Splink."
+        ),
+        category=DeprecationWarning,
+        stacklevel=2,
+    )
+
 
 # Use getarr to make the error appear at the point of use
 def __getattr__(name):