Bump min Python to 3.9

Based on #240

Co-authored-by: David Stansby <dstansby@gmail.com>

Author: ConorMacBride

.github/workflows/test_and_publish.yml

@@ -27,24 +27,26 @@ jobs:
           - inkscape
       envs: |
         # Test oldest SPEC 0 configurations
-        - linux: py311-test-mpl37
-        - macos: py311-test-mpl37
-        - windows: py311-test-mpl37
+        - linux: py311-test-mpl38
+        - macos: py311-test-mpl38
+        - windows: py311-test-mpl38
         # Test newest configurations
-        - linux: py313-test-mpl39
-        - macos: py313-test-mpl39
-        - windows: py313-test-mpl39
+        - linux: py313-test-mpl310
+        - macos: py313-test-mpl310
+        - windows: py313-test-mpl310
         # Test intermediate SPEC 0 configurations on Linux
-        - linux: py312-test-mpl37
-        - linux: py311-test-mpl38
-        - linux: py313-test-mpl38
+        - linux: py311-test-mpl39
         - linux: py312-test-mpl39
+        - linux: py311-test-mpl310
+        - linux: py312-test-mpl310
         # Test non-SPEC 0 configurations
         - linux: py313-test-mpldev-pytestdev
         - linux: py311-test-mpl37-pytest74
         - linux: py39-test-mpl33-pytest62
-        - linux: py37-test-mpl22-pytest54
-          runs-on: ubuntu-22.04
+        # Test oldest non-SPEC 0 configurations
+        - linux: py39-test-mpl33
+        - macos: py39-test-mpl33
+        - windows: py39-test-mpl33
       coverage: 'codecov'
 
   publish:

.readthedocs.yaml

@@ -5,6 +5,9 @@ build:
   tools:
     python: "3.11"
 
+sphinx:
+  configuration: docs/conf.py
+
 python:
   install:
     - method: pip

docs/installing.rst

@@ -4,7 +4,7 @@
 Installation Guide
 ##################
 
-This plugin is compatible with Python 3.6 and later, and
+This plugin is compatible with Python 3.9 and later, and
 requires `pytest <http://pytest.org>`__ and
 `matplotlib <http://www.matplotlib.org>`__ to be installed.
 

setup.cfg

@@ -23,7 +23,7 @@ long_description_content_type = text/x-rst
 zip_safe = True
 packages = find:
 include_package_data = True
-python_requires = >=3.6
+python_requires = >=3.9
 install_requires =
     pytest
     matplotlib
@@ -41,8 +41,9 @@ test =
     pytest-cov
 docs =
     sphinx
-    mpl_sphinx_theme>=3.6.0.dev0
+    mpl_sphinx_theme>=3.9.0
     sphinx_design
+    matplotlib==3.9.*
 
 [tool:pytest]
 testpaths = tests

tox.ini

@@ -35,6 +35,7 @@ deps =
     mpl37: matplotlib==3.7.*
     mpl38: matplotlib==3.8.*
     mpl39: matplotlib==3.9.*
+    mpl310: matplotlib==3.10.*
     mpldev: matplotlib>=0.0.dev0
     pytest54: pytest==5.4.*
     pytest60: pytest==6.0.*