Bumping minimum supported Python to 3.8

.github/workflows/unit-tests-macos.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         # Selected python versions only
-        python-version: ['3.7', '3.11']
+        python-version: ['3.8', '3.11']
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/unit-tests-ubuntu.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         # All Python versions except latest, which is tested by coverage.
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/unit-tests-windows.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         # Selected python versions only
-        python-version: ['3.7', '3.11']
+        python-version: ['3.8', '3.11']
 
     steps:
       - uses: actions/checkout@v4

CHANGELOG.md

@@ -5,6 +5,7 @@ This page lists the main changes made to Myokit in each release.
 ## Unreleased
 - Added
 - Changed
+  - [#1061](https://github.com/myokit/myokit/pull/1061) Myokit is no longer tested on Python 3.7. Please use versions 3.8 and up.
 - Deprecated
 - Removed
 - Fixed

CONTRIBUTING.md

@@ -169,7 +169,7 @@ Because most libraries do, Myokit uses American spelling (e.g. "color", "fiber",
 
 ## Python and C versions
 
-Myokit is developed for Python 3.7 and newer, and tested on whatever GitHub Actions (easily) allows (3.7+ at time of writing).
+Myokit is developed for Python 3.8 and newer, and tested on whatever GitHub Actions (easily) allows (3.8+ at time of writing).
 
 The C code in Myokit should stick to C89 with some exceptions, see [here](https://peps.python.org/pep-0007/)).