Use a variable for the minimum Python version in the docs

Author: adamtheturtle

docs/source/conf.py

@@ -47,11 +47,16 @@
 # The name of the syntax highlighting style to use.
 pygments_style = 'sphinx'
 
+python_minumum_supported_version = '3.9'
+
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'VWSPYTHONMOCKdoc'
 autoclass_content = 'init'
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/3.9', None),
+    'python': (
+        f'https://docs.python.org/{python_minumum_supported_version}',
+        None,
+    ),
     'docker': ('https://docker-py.readthedocs.io/en/stable', None),
 }
 nitpicky = True
@@ -85,6 +90,7 @@
 autodoc_member_order = 'bysource'
 
 rst_prolog = f"""
+.. |python-minumum-version| replace:: {python_minumum_supported_version}
 .. |project| replace:: {project}
 .. |release| replace:: {release}
 .. |github-owner| replace:: VWS-Python

docs/source/index.rst

@@ -8,7 +8,7 @@ Mocking calls made to Vuforia with Python ``requests``
 
    pip3 install vws-python-mock
 
-This requires Python 3.9+.
+This requires Python |python-minumum-version|\+.
 
 .. include:: basic-example.rst
 

docs/source/installation.rst

@@ -5,4 +5,4 @@ Installation
 
    pip3 install vws-python-mock
 
-This requires Python 3.9+.
+This requires Python |python-minumum-version|\+.

docs/source/release-process.rst

@@ -10,7 +10,7 @@ Outcomes
 Prerequisites
 ~~~~~~~~~~~~~
 
-* ``python3`` on your ``PATH`` set to Python 3.9+.
+* ``python3`` on your ``PATH`` set to Python |python-minumum-version|\+.
 * ``virtualenv``.
 * Push access to this repository.
 * Trust that ``master`` is ready and high enough quality for release.