Fix warnings in Sphinx configuration.

Author: HexDecimal

docs/conf.py

@@ -17,7 +17,10 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #
 import os
+import re
+import subprocess
 import sys
+from typing import Dict
 
 sys.path.insert(0, os.path.abspath(".."))
 
@@ -65,14 +68,17 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-from subprocess import check_output
-
-release = check_output(["git", "describe", "--abbrev=0"], universal_newlines=True).strip()
+git_describe = subprocess.run(
+    ["git", "describe", "--abbrev=0"], stdout=subprocess.PIPE, universal_newlines=True, check=True
+)
+release = git_describe.stdout.strip()
+assert release
 print("release version: %r" % release)
-# The short X.Y version.
-import re
 
-version = re.match(r"([0-9]+\.[0-9]+).*?", release).group()
+# The short X.Y version.
+match_version = re.match(r"([0-9]+\.[0-9]+).*?", release)
+assert match_version
+version = match_version.group()
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -261,7 +267,7 @@
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
+latex_elements: Dict[str, str] = {
     # The paper size ('letterpaper' or 'a4paper').
     # 'papersize': 'letterpaper',
     # The font size ('10pt', '11pt' or '12pt').