From 2398624c2e3e764c8e3e282062db49ad4479a5ad Mon Sep 17 00:00:00 2001
From: James Lamb <jlamb@nvidia.com>
Date: Fri, 23 Aug 2024 08:06:37 -0500
Subject: [PATCH] Drop Python 3.9 support (#6040)

Contributes to https://github.com/rapidsai/build-planning/issues/88

Finishes the work of dropping Python 3.9 support.

This project stopped building / testing against Python 3.9 as of https://github.com/rapidsai/shared-workflows/pull/235.
This PR updates configuration and docs to reflect that.

## Notes for Reviewers

### How I tested this

Checked that there were no remaining uses like this:

```shell
git grep -E '3\.9'
git grep '39'
git grep 'py39'
```

And similar for variations on Python 3.8 (to catch things that were missed the last time this was done).

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: https://github.com/rapidsai/cuml/pull/6040
---
 conda/environments/all_cuda-118_arch-x86_64.yaml | 2 +-
 conda/environments/all_cuda-125_arch-x86_64.yaml | 2 +-
 dependencies.yaml                                | 6 +-----
 python/cuml/cuml/internals/available_devices.py  | 8 ++------
 python/cuml/pyproject.toml                       | 5 ++---
 5 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/conda/environments/all_cuda-118_arch-x86_64.yaml b/conda/environments/all_cuda-118_arch-x86_64.yaml
index e8a39e250e..73cfd8f1e0 100644
--- a/conda/environments/all_cuda-118_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-118_arch-x86_64.yaml
@@ -57,7 +57,7 @@ dependencies:
 - pytest-cov
 - pytest-xdist
 - pytest==7.*
-- python>=3.9,<3.12
+- python>=3.10,<3.12
 - raft-dask==24.10.*,>=0.0.0a0
 - rapids-build-backend>=0.3.0,<0.4.0.dev0
 - rapids-dask-dependency==24.10.*,>=0.0.0a0
diff --git a/conda/environments/all_cuda-125_arch-x86_64.yaml b/conda/environments/all_cuda-125_arch-x86_64.yaml
index 293028cdb1..43bf7117b3 100644
--- a/conda/environments/all_cuda-125_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-125_arch-x86_64.yaml
@@ -53,7 +53,7 @@ dependencies:
 - pytest-cov
 - pytest-xdist
 - pytest==7.*
-- python>=3.9,<3.12
+- python>=3.10,<3.12
 - raft-dask==24.10.*,>=0.0.0a0
 - rapids-build-backend>=0.3.0,<0.4.0.dev0
 - rapids-dask-dependency==24.10.*,>=0.0.0a0
diff --git a/dependencies.yaml b/dependencies.yaml
index 8c2508ce6b..1c8afd0a81 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -462,10 +462,6 @@ dependencies:
     specific:
       - output_types: conda
         matrices:
-          - matrix:
-              py: "3.9"
-            packages:
-              - python=3.9
           - matrix:
               py: "3.10"
             packages:
@@ -476,7 +472,7 @@ dependencies:
               - python=3.11
           - matrix:
             packages:
-              - python>=3.9,<3.12
+              - python>=3.10,<3.12
   test_libcuml:
     common:
       - output_types: conda
diff --git a/python/cuml/cuml/internals/available_devices.py b/python/cuml/cuml/internals/available_devices.py
index 8110f1b5d1..ee3b9b2500 100644
--- a/python/cuml/cuml/internals/available_devices.py
+++ b/python/cuml/cuml/internals/available_devices.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2022-2023, NVIDIA CORPORATION.
+# Copyright (c) 2022-2024, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,12 +16,8 @@
 from cuml.internals.device_support import GPU_ENABLED
 from cuml.internals.safe_imports import gpu_only_import_from, UnavailableError
 
-try:
-    from functools import cache  # requires Python >= 3.9
-except ImportError:
-    from functools import lru_cache
 
-    cache = lru_cache(maxsize=None)
+from functools import cache
 
 
 def gpu_available_no_context_creation():
diff --git a/python/cuml/pyproject.toml b/python/cuml/pyproject.toml
index ad8d16e076..357f427bff 100644
--- a/python/cuml/pyproject.toml
+++ b/python/cuml/pyproject.toml
@@ -78,7 +78,7 @@ authors = [
     { name = "NVIDIA Corporation" },
 ]
 license = { text = "Apache 2.0" }
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "cudf==24.10.*,>=0.0.0a0",
     "cupy-cuda11x>=12.0.0",
@@ -102,7 +102,6 @@ dependencies = [
 classifiers = [
     "Intended Audience :: Developers",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]
@@ -134,7 +133,7 @@ Documentation = "https://docs.rapids.ai/api/cuml/stable/"
 
 [tool.black]
 line-length = 79
-target-version = ["py39"]
+target-version = ["py310"]
 include = '\.py?$'
 force-exclude = '''
 _stop_words\.py |