Use black formatter for Python

.vscode/extensions.json

@@ -2,6 +2,7 @@
   "recommendations": [
     "ms-vscode.cpptools",
     "xaver.clang-format",
-    "akiramiyakoda.cppincludeguard"
+    "akiramiyakoda.cppincludeguard",
+    "ms-python.black-formatter"
   ]
 }

.vscode/settings.json

@@ -7,6 +7,9 @@
     "files.encoding": "shiftjis",
     "editor.defaultFormatter": "xaver.clang-format"
   },
+  "[python]":{
+    "editor.defaultFormatter": "ms-python.black-formatter"
+  },
   "editor.tabSize": 2,
   "files.associations": {
     "source_location": "cpp",