Remove support of py3.9

.github/workflows/ci-code.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.14']
+        python-version: ['3.10', '3.14']
         database-backend: [psql]
 
     services:
@@ -101,7 +101,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9']
+        python-version: ['3.10']
         database-backend: [sqlite]
 
     services:
@@ -213,7 +213,7 @@ jobs:
     - name: Install aiida-core
       uses: ./.github/actions/install-aiida-core
       with:
-        python-version: '3.9'
+        python-version: '3.10'
         from-lock: 'true'
         extras: tests
 

.github/workflows/docs-build.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install aiida-core and docs deps
       uses: ./.github/actions/install-aiida-core
       with:
-        python-version: '3.9'
+        python-version: '3.10'
         extras: docs,tests,rest,atomic_tools
         from-lock: 'false'
 

.github/workflows/release.yml

@@ -30,10 +30,10 @@ jobs:
     - name: Checkout repo
       uses: actions/checkout@v6
 
-    - name: Set up Python 3.9
+    - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:
-        python-version: '3.9'
+        python-version: '3.10'
 
     - name: Check tag
       run: python .github/workflows/check_release_tag.py $GITHUB_REF
@@ -95,10 +95,10 @@ jobs:
     steps:
     - name: Checkout source
       uses: actions/checkout@v6
-    - name: Set up Python 3.9
+    - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:
-        python-version: '3.9'
+        python-version: '3.10'
     - name: Install flit
       run: pip install flit~=3.4
     - name: Build
@@ -123,10 +123,10 @@ jobs:
     steps:
     - name: Checkout source
       uses: actions/checkout@v6
-    - name: Set up Python 3.9
+    - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:
-        python-version: '3.9'
+        python-version: '3.10'
     - name: Install flit
       run: pip install flit~=3.4
     - name: Build

.github/workflows/test-install.yml

@@ -84,10 +84,10 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Set up Python 3.9
+    - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:
-        python-version: '3.9'
+        python-version: '3.10'
 
     - name: Pip install
       id: pip_install
@@ -111,7 +111,7 @@ jobs:
       fail-fast: false
       matrix:
 
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
         # Not being able to install with conda on a specific Python version is
         # not sufficient to fail the run, but something we want to be aware of.
@@ -165,7 +165,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
     services:
       postgres:

environment.yml

@@ -5,7 +5,7 @@ channels:
 - conda-forge
 - defaults
 dependencies:
-- python~=3.9
+- python>=3.10
 - alembic~=1.8
 - archive-path~=0.4.2
 - asyncssh~=2.21.0

pyproject.toml

@@ -18,7 +18,6 @@ classifiers = [
   'Operating System :: POSIX :: Linux',
   'Operating System :: MacOS :: MacOS X',
   'Programming Language :: Python',
-  'Programming Language :: Python :: 3.9',
   'Programming Language :: Python :: 3.10',
   'Programming Language :: Python :: 3.11',
   'Programming Language :: Python :: 3.12',
@@ -69,7 +68,7 @@ keywords = ['aiida', 'workflows']
 license = {file = 'LICENSE.txt'}
 name = 'aiida-core'
 readme = 'README.md'
-requires-python = '>=3.9'
+requires-python = '>=3.10'
 
 [project.entry-points.'aiida.brokers']
 'core.rabbitmq' = 'aiida.brokers.rabbitmq.broker:RabbitmqBroker'
@@ -261,7 +260,7 @@ pre-commit = [
   'types-requests~=2.0'
 ]
 rest = [
-  'flask-cors~=3.0',
+  'flask-cors~=4.0',
   'flask-restful~=0.3.10',
   'flask~=2.3.3',
   'pyparsing~=3.1',
@@ -496,33 +495,32 @@ envlist = py39
 [testenv]
 usedevelop=True
 deps =
-    py39: -rrequirements/requirements-py-3.9.txt
     py310: -rrequirements/requirements-py-3.10.txt
     py311: -rrequirements/requirements-py-3.11.txt
     py312: -rrequirements/requirements-py-3.12.txt
 
-[testenv:py{39,310,311,312}-presto]
+[testenv:py{310,311,312}-presto]
 passenv =
     PYTHONASYNCIODEBUG
 setenv =
     AIIDA_WARN_v3 =
 commands = pytest -m 'presto' {posargs}
 
-[testenv:py{39,310,311,312}]
+[testenv:py{310,311,312}]
 passenv =
     PYTHONASYNCIODEBUG
 setenv =
     AIIDA_WARN_v3 =
 commands = pytest {posargs}
 
-[testenv:py{39,310,311,312}-verdi]
+[testenv:py{310,311,312}-verdi]
 passenv =
     AIIDA_TEST_BACKEND
 setenv =
     AIIDA_PATH = {toxinidir}/.tox/.aiida
 commands = verdi {posargs}
 
-[testenv:py{39,310,311,312}-docs-{clean,update}]
+[testenv:py{310,311,312}-docs-{clean,update}]
 description =
     clean: Build the documentation (remove any existing build)
     update: Build the documentation (modify any existing build)
@@ -535,11 +533,10 @@ commands =
     clean: make clean
     make debug
 
-[testenv:py{39,310,311,312}-docs-live]
+[testenv:py{310,311,312}-docs-live]
 # tip: remove apidocs before using this feature (`cd docs; make clean`)
 description = Build the documentation and launch browser (with live updates)
 deps =
-    py39: -rrequirements/requirements-py-3.9.txt
     py310: -rrequirements/requirements-py-3.10.txt
     py311: -rrequirements/requirements-py-3.11.txt
     py312: -rrequirements/requirements-py-3.12.txt

src/aiida/orm/nodes/data/array/bands.py

@@ -10,6 +10,7 @@
 in a Brillouin zone, and how to operate on them.
 """
 
+import itertools
 import json
 import typing as t
 from string import Template
@@ -493,7 +494,7 @@ def _get_bandplot_data(self, cartesian, prettify_format=None, join_symbol=None,
                 # I add an empty label that points to the last band if the last label does not do it
                 if labels[-1][0] != len(bands) - 1:
                     labels.append((len(bands) - 1, ''))
-                for (position_from, label_from), (position_to, label_to) in zip(labels[:-1], labels[1:]):
+                for (position_from, label_from), (position_to, label_to) in itertools.pairwise(labels):
                     if position_to - position_from > 1:
                         # Create a new path line only if there are at least two points,
                         # otherwise it is probably just a discontinuity point in the band

utils/dependency_management.py

@@ -131,7 +131,8 @@ def generate_environment_yml():
     # python version cannot be overriden from outside environment.yml
     # (even if it is not specified at all in environment.yml)
     # https://github.com/conda/conda/issues/9506
-    conda_requires = ['python~=3.9']
+    python_requires = pyproject['project']['requires-python']
+    conda_requires = [f'python{python_requires}']
     for req in install_requirements:
         if req.name == 'python' or any(re.match(ignore, str(req)) for ignore in CONDA_IGNORE):
             continue