chore: drop Python 3.8/3.9 support, bump minimum to 3.10

Python 3.8 reached EOL in October 2024 and 3.9 in October 2025.
The lmdb package is also broken on Python 3.8 CI runners.
Update classifiers, requires-python, CI matrix, docs, and remove
legacy Python <3.8 fallbacks.

Author: Han Wang

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.10", "3.13"]
 
     steps:
     - uses: actions/checkout@v6

README.md

@@ -15,7 +15,7 @@ If you use this software, please cite the following paper:
 
 ## Installation
 
-dpdata only supports Python 3.8 and above. You can [setup a conda/pip environment](https://docs.deepmodeling.com/faq/conda.html), and then use one of the following methods to install dpdata:
+dpdata only supports Python 3.10 and above. You can [setup a conda/pip environment](https://docs.deepmodeling.com/faq/conda.html), and then use one of the following methods to install dpdata:
 
 - Install via pip: `pip install dpdata`
 - Install via conda: `conda install -c conda-forge dpdata`

docs/installation.md

@@ -1,6 +1,6 @@
 # Installation
 
-dpdata only supports Python 3.8 and above. You can [setup a conda/pip environment](https://docs.deepmodeling.com/faq/conda.html), and then use one of the following methods to install dpdata:
+dpdata only supports Python 3.10 and above. You can [setup a conda/pip environment](https://docs.deepmodeling.com/faq/conda.html), and then use one of the following methods to install dpdata:
 
 - Install via pip: `pip install dpdata`
 - Install via conda: `conda install -c conda-forge dpdata`

dpdata/plugins/__init__.py

@@ -1,13 +1,9 @@
 from __future__ import annotations
 
 import importlib
+from importlib import metadata
 from pathlib import Path
 
-try:
-    from importlib import metadata
-except ImportError:  # for Python<3.8
-    import importlib_metadata as metadata
-
 PACKAGE_BASE = "dpdata.plugins"
 NOT_LOADABLE = ("__init__.py",)
 

pyproject.toml

@@ -12,10 +12,10 @@ authors = [
 ]
 license = {file = "LICENSE"}
 classifiers = [
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
 ]
 dependencies = [
@@ -26,10 +26,8 @@ dependencies = [
     'wcmatch',
     'lmdb',
     'msgpack-numpy',
-    'importlib_metadata>=1.4; python_version < "3.8"',
-    'typing_extensions; python_version < "3.8"',
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 readme = "README.md"
 keywords = ["lammps", "vasp", "deepmd-kit"]
 
@@ -46,8 +44,7 @@ test = [
 ]
 ase = ['ase']
 amber = [
-    'parmed; python_version >= "3.8"',
-    'parmed<4; python_version < "3.8"',
+    'parmed',
 ]
 pymatgen = ['pymatgen']
 docs = [

tests/plugin/pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
     'dpdata',
 ]
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 
 [project.entry-points.'dpdata.plugins']
 random = "dpdata_plugin_test:ep"