Code Rewrite to support multi instances

.vscode/settings.json

@@ -1,4 +1,10 @@
 {
     "editor.formatOnSave": true,
-    "editor.defaultFormatter": "ms-python.black-formatter"
+    "editor.defaultFormatter": "ms-python.black-formatter",
+    "python.terminal.activateEnvironment": true,
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
 }