getting for open as f and mode=x working

src/PyodideWorker.js

@@ -381,12 +381,15 @@ const PyodideWorker = () => {
     await pyodide.runPythonAsync(`
       import basthon
       import builtins
+      import os
 
       # Save the original open function
       _original_open = builtins.open
 
       def _custom_open(filename, mode="r", *args, **kwargs):
-          if "w" in mode or "a" in mode:
+          if "x" in mode and os.path.exists(filename):
+            raise FileExistsError(f"File '{filename}' already exists")
+          if "w" in mode or "a" in mode or "x" in mode:
               class CustomFile:
                   def __init__(self, filename):
                       self.filename = filename
@@ -400,6 +403,12 @@ const PyodideWorker = () => {
                   def close(self):
                       pass
 
+                  def __enter__(self):
+                      return self
+
+                  def __exit__(self, exc_type, exc_val, exc_tb):
+                      self.close()
+
               return CustomFile(filename)
           else:
               return _original_open(filename, mode, *args, **kwargs)

src/components/Editor/Runners/PythonRunner/PyodideRunner/VisualOutputPane.jsx

@@ -74,7 +74,7 @@ const VisualOutputPane = ({ visuals, setVisuals }) => {
           (item) => item.extension === extension && item.name === name
         );
         let updatedContent;
-        if (content.mode === "w") {
+        if (content.mode === "w" || content.mode === "x") {
           updatedContent = content.content;
         } else if (content.mode === "a") {
           updatedContent = componentToUpdate.content + "\n" + content.content;