Drop support for py38 (#557)

The support for Python versions follows the same timeline as that of numpy, defined in NEP 029. According to that schema, Python 3.8 is no longer support as of April 14 2023 and so official support is also dropped in AWB.
Meanwhile, the current Docker stack based on Jupyter docker image is currently Python 3.9, and it was never actually 3.8, so this is a safe deprecation. It would only affect users that are still on the old old docker stack, and those are suggested to migrate to use the new aiidalab docker image.

.github/workflows/ci.yml

@@ -108,7 +108,7 @@ jobs:
         strategy:
             matrix:
                 tag: [latest]
-                python-version: ['3.8', '3.9', '3.10']
+                python-version: ['3.9', '3.10']
             fail-fast: false
 
         runs-on: ubuntu-latest

.pre-commit-config.yaml

@@ -53,7 +53,7 @@ repos:
       rev: v3.15.0
       hooks:
           - id: pyupgrade
-            args: [--py37-plus]
+            args: [--py39-plus]
 
     - repo: https://github.com/kynan/nbstripout
       rev: 0.6.1

aiidalab_widgets_base/nodes.py

@@ -1,6 +1,5 @@
 """Widgets to work with AiiDA nodes."""
 import functools
-import typing
 
 import ipytree
 import ipywidgets as ipw
@@ -93,9 +92,7 @@ class AiidaOutputsTreeNode(ipytree.Node):
     icon = tl.Unicode("folder").tag(sync=True)
     disabled = tl.Bool(True).tag(sync=True)
 
-    def __init__(
-        self, name, parent_pk, namespaces: typing.Tuple[str, ...] = (), **kwargs
-    ):
+    def __init__(self, name, parent_pk, namespaces: tuple[str, ...] = (), **kwargs):
         self.parent_pk = parent_pk
         self.nodes_registry = {}
         self.namespaces = namespaces

aiidalab_widgets_base/utils/__init__.py

@@ -1,7 +1,7 @@
 """Some utility functions used acrross the repository."""
 import threading
 from enum import Enum
-from typing import Any, Tuple
+from typing import Any
 
 import ipywidgets as ipw
 import more_itertools as mit
@@ -200,7 +200,7 @@ def wrap_message(message, level=MessageLevel.INFO):
     """
 
 
-def ase2spglib(ase_structure: Atoms) -> Tuple[Any, Any, Any]:
+def ase2spglib(ase_structure: Atoms) -> tuple[Any, Any, Any]:
     """
     Convert ase Atoms instance to spglib cell in the format defined at
     https://spglib.github.io/spglib/python-spglib.html#crystal-structure-cell

setup.cfg

@@ -36,7 +36,7 @@ install_requires =
     nglview~=3.0
     spglib>=1.14,<3
     vapory~=0.1.2
-python_requires = >=3.8
+python_requires = >=3.9
 include_package_data = True
 zip_safe = False