Defined constants to reduce duplication

"localtoc.html" and "ethicalads.html" were repeated 3 times. Defined constants to reduce code duplication.

CHANGES.rst

@@ -6,6 +6,15 @@ Version 2.2.0
 Unreleased
 
 
+Version 2.1.1
+-------------
+
+Released on 2022-03-30
+
+-   Set the minimum required version of importlib_metadata to 3.6.0,
+    which is required on Python < 3.10. :issue:`4502`
+
+
 Version 2.1.0
 -------------
 

docs/conf.py

@@ -2,6 +2,11 @@ import packaging.version
 from pallets_sphinx_themes import get_version
 from pallets_sphinx_themes import ProjectLink
 
+# Constants ------------------------------------------------------------
+ETHICALADS_PATH="ethicalads.html"
+LOCALTOC_PATH="localtoc.html"
+
+
 # Project --------------------------------------------------------------
 
 project = "Flask"
@@ -49,10 +54,10 @@ html_context = {
     ]
 }
 html_sidebars = {
-    "index": ["project.html", "localtoc.html", "searchbox.html", "ethicalads.html"],
-    "**": ["localtoc.html", "relations.html", "searchbox.html", "ethicalads.html"],
+    "index": ["project.html", LOCALTOC_PATH, "searchbox.html", ETHICALADS_PATH],
+    "**": [LOCALTOC_PATH, "relations.html", "searchbox.html", ETHICALADS_PATH],
 }
-singlehtml_sidebars = {"index": ["project.html", "localtoc.html", "ethicalads.html"]}
+singlehtml_sidebars = {"index": ["project.html", LOCALTOC_PATH, ETHICALADS_PATH]}
 html_static_path = ["_static"]
 html_favicon = "_static/flask-icon.png"
 html_logo = "_static/flask-icon.png"

setup.py

@@ -8,7 +8,7 @@ setup(
         "Jinja2 >= 3.0",
         "itsdangerous >= 2.0",
         "click >= 8.0",
-        "importlib-metadata; python_version < '3.10'",
+        "importlib-metadata >= 3.6.0; python_version < '3.10'",
     ],
     extras_require={
         "async": ["asgiref >= 3.2"],