Remove python=3.8 from testing (not supported by latest pymatgen,…

… though vast majority of `doped` features can still work with `3.8`)

.github/workflows/pip_install_test.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
 
       matrix:
-        python-version: [ '3.8', '3.9', '3.10', '3.11' ]
+        python-version: [ '3.9', '3.10', '3.11' ]
         os: [ ubuntu-latest ]
 
     runs-on: ${{ matrix.os }}

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
 
       matrix:
-        python-version: [ '3.8', '3.9', '3.10', '3.11' ]
+        python-version: [ '3.9', '3.10', '3.11' ]
         os: [ ubuntu-latest ]
 
     runs-on: ${{ matrix.os }}

.readthedocs.yaml

@@ -8,7 +8,7 @@ version: 2
 build:
   os: ubuntu-20.04
   tools:
-    python: "3.8"
+    python: "3.9"
 
 # Build from the docs/ directory with Sphinx
 sphinx:

docs/conf.py

@@ -109,7 +109,7 @@
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    "python": ("https://docs.python.org/3.8", None),
+    "python": ("https://docs.python.org/3.9", None),
     "numpy": ("http://docs.scipy.org/doc/numpy/", None),
     "pymatgen": ("http://pymatgen.org/", None),
     "matplotlib": ("http://matplotlib.org", None),

pyproject.toml

@@ -16,7 +16,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Chemistry",
     "Topic :: Software Development :: Libraries :: Python Modules",
     ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "tabulate",
     "matplotlib>=3.5.2",

tests/test_vasp.py

@@ -6,7 +6,6 @@
 import locale
 import os
 import random
-import sys
 import unittest
 import warnings
 
@@ -66,7 +65,7 @@ def _check_no_potcar_available_warning_error(symbol, message):
         x in str(message)
         for x in [
             f"No POTCAR for {symbol} with functional",
-            "Please set the PMG_VASP_PSP_DIR",  # message differs slightly for python 3.8 vs >=3.9
+            "Please set the PMG_VASP_PSP_DIR",
         ]
     )
 
@@ -1166,14 +1165,10 @@ def test_write_files_defect_entry_list(self):
                     check_potcar_spec=True,
                 )
 
-    @unittest.skipIf(sys.version_info[:2] == (3, 8), "Test is skipped for Python 3.8")
     def test_initialise_and_write_all_defect_gens(self):
         """
         Test initialising DefectsSet with our generation-tests materials, and
         writing files to disk.
-
-        Hangs on GitHub Actions python=3.8 for some reason, so skipped if we're
-        on python=3.8.
         """
         for defect_gen_name in [
             "ytos_defect_gen",