drop python3.9

.github/workflows/main.yml

@@ -148,10 +148,6 @@ jobs:
           environment-file: environment-dev.yml
           create-args: >-
             python=${{ matrix.python-version }}
-      - name: Downgrade intake-esm
-        if: matrix.python-version == '3.9'
-        run: |
-          micromamba install -y -c conda-forge intake-esm=2023.11.10
       - name: Conda and Mamba versions
         run: |
           echo "micromamba $(micromamba --version)"

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
     rev: v3.17.0
     hooks:
       - id: pyupgrade
-        args: [ '--py39-plus' ]
+        args: [ '--py310-plus' ]
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.6.0
     hooks:
@@ -77,10 +77,10 @@ repos:
     rev: 1.8.5
     hooks:
       - id: nbqa-pyupgrade
-        args: [ '--py39-plus' ]
+        args: [ '--py310-plus' ]
         additional_dependencies: [ 'pyupgrade==3.17.0' ]
       - id: nbqa-black
-        args: [ '--target-version=py39' ]
+        args: [ '--target-version=py310' ]
         additional_dependencies: [ 'black==24.8.0' ]
       - id: nbqa-isort
         additional_dependencies: [ 'isort==5.13.2' ]

CONTRIBUTING.rst

@@ -257,7 +257,7 @@ Before you submit a pull request, check that it meets these guidelines:
 
 #. The pull request should not break the templates.
 
-#. The pull request should work for all currently supported Python versions. Check the `pyproject.toml` or `tox.ini` files for the list of supported versions.
+#. The pull request should work for all currently supported Python versions. Check the `pyproject.toml` or `tox.ini` files for the list of supported versions. We aim to follow the support and drop schedule of Python versions as recommended by the NumPy NEP calendar: https://numpy.org/neps/nep-0029-deprecation_policy.html
 
 Tips
 ----

environment-dev.yml

@@ -2,7 +2,7 @@ name: xscen-dev
 channels:
   - conda-forge
 dependencies:
-  - python >=3.9,<3.13
+  - python >=3.10,<3.13
   # Don't forget to sync changes between environment.yml, environment-dev.yml, and pyproject.toml!
   # Also consider updating the list in xs.utils.show_versions if you add a new package.
   # Main packages

environment.yml

@@ -2,7 +2,7 @@ name: xscen
 channels:
   - conda-forge
 dependencies:
-  - python >=3.9,<3.13
+  - python >=3.10,<3.13
   # Don't forget to sync changes between environment.yml, environment-dev.yml, and pyproject.toml!
   # Also consider updating the list in xs.utils.show_versions if you add a new package.
   # Main packages

pyproject.toml

@@ -19,7 +19,7 @@ maintainers = [
 ]
 description = "A climate change scenario-building analysis framework, built with xclim/xarray."
 readme = "README.rst"
-requires-python = ">=3.9.0"
+requires-python = ">=3.10.0"
 keywords = ["xscen"]
 classifiers = [
   "Development Status :: 4 - Beta",
@@ -30,7 +30,6 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python :: 3 :: Only",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -50,8 +49,7 @@ dependencies = [
   "geopandas",
   "h5netcdf",
   "h5py",
-  "intake-esm >=2023.07.07,<v2024.2.6; python_version == '3.9'",
-  "intake-esm >=2023.07.07; python_version >= '3.10'",
+  "intake-esm >=2023.07.07",
   "matplotlib",
   "netCDF4 <1.7",
   "numcodecs",
@@ -127,7 +125,6 @@ all = ["xscen[dev]", "xscen[docs]", "xscen[extra]"]
 
 [tool.black]
 target-version = [
-  "py39",
   "py310",
   "py311",
   "py312"
@@ -205,11 +202,11 @@ source = ["xscen"]
 append_only = true
 known_first_party = "xscen"
 profile = "black"
-py_version = 39
+py_version = 310
 
 [tool.mypy]
 files = "."
-python_version = 3.9
+python_version = 3.10
 show_error_codes = true
 strict = true
 warn_no_return = true
@@ -261,7 +258,7 @@ markers = ["requires_netcdf: marks tests that require netcdf files to run"]
 [tool.ruff]
 src = ["src/xscen"]
 line-length = 150
-target-version = "py39"
+target-version = "py310"
 exclude = [
   ".eggs",
   ".git",