Drop Python 3.8

Author: y0z

.github/workflows/checks_template.yml

@@ -15,7 +15,7 @@ on:
       python_matrix:
         required: false
         type: string
-        default: "['3.8', '3.9', '3.10', '3.11', '3.12']"
+        default: "['3.9', '3.10', '3.11', '3.12']"
   workflow_dispatch:
 
 jobs:

.readthedocs.yml

@@ -19,7 +19,7 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  # `sphinx` requires either Python >= 3.8 or `typed-ast` to reflect type comments 
+  # `sphinx` requires either Python >= 3.9 or `typed-ast` to reflect type comments
   # in the documentation. See: https://github.com/sphinx-doc/sphinx/pull/6984
   install:
     - method: pip

README.md

@@ -1,6 +1,6 @@
 # Optuna-Integration
 
-[![Python](https://img.shields.io/badge/python-3.8%20%7C%203.9%20%7C%203.10%20%7C%203.11%20%7C%203.12-blue)](https://www.python.org)
+[![Python](https://img.shields.io/badge/python-3.9%20%7C%203.10%20%7C%203.11%20%7C%203.12-blue)](https://www.python.org)
 [![pypi](https://img.shields.io/pypi/v/optuna-integration.svg)](https://pypi.python.org/pypi/optuna-integration)
 [![conda](https://img.shields.io/conda/vn/conda-forge/optuna-integration.svg)](https://anaconda.org/conda-forge/optuna-integration)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/optuna/optuna-integration)
@@ -34,7 +34,7 @@ $ conda install -c conda-forge optuna-integration
 > ```
 
 > [!NOTE]
-> Optuna-Integration supports from Python 3.8 to Python 3.12.
+> Optuna-Integration supports from Python 3.9 to Python 3.12.
 > Optuna Docker image is also provided at [DockerHub](https://hub.docker.com/r/optuna/optuna).
 
 ## Integration Modules

docs/source/installation.rst

@@ -1,7 +1,7 @@
 Installation
 ============
 
-Optuna-Integration supports Python 3.8 or newer.
+Optuna-Integration supports Python 3.9 or newer.
 
 We recommend to install Optuna-Integration via pip:
 

pyproject.toml

@@ -12,7 +12,6 @@ classifiers = [
   "Intended Audience :: Developers",
   "License :: OSI Approved :: MIT License",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -25,7 +24,7 @@ classifiers = [
   "Topic :: Software Development :: Libraries",
   "Topic :: Software Development :: Libraries :: Python Modules",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
   "optuna",
 ]
@@ -54,7 +53,7 @@ document = [
     "mlflow",
     "pandas",
     "scikit-learn>=0.24.2",
-    "scipy>=1.9.2; python_version>='3.8'",
+    "scipy>=1.9.2; python_version>='3.9'",
     "sphinx",
     "sphinx-notfound-page",
     "sphinx_rtd_theme",