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app.py

@@ -172,33 +172,47 @@ def run_notebook_cell(notebook_name: str, cell_number: int) -> str:
     notebook_path = NOTEBOOKS_DIR / notebook_name
     
     if not notebook_path.exists():
-        return f"Error: Notebook not found"
+        return f"Error: Notebook not found at {notebook_path}"
     
     try:
+        # Change to notebooks directory so relative paths work
+        original_cwd = os.getcwd()
+        os.chdir(NOTEBOOKS_DIR)
+        
         with open(notebook_path, 'r') as f:
             nb = json.load(f)
         
         cells = [c for c in nb.get('cells', []) if c.get('cell_type') == 'code']
         
         if cell_number < 1 or cell_number > len(cells):
+            os.chdir(original_cwd)
             return f"Error: Cell {cell_number} not found. Available: 1-{len(cells)}"
         
         cell = cells[cell_number - 1]
         source = ''.join(cell.get('source', []))
         
-        # Execute the code
+        # Execute the code with proper namespace
         import io
         from contextlib import redirect_stdout, redirect_stderr
         
+        # Create a namespace with common imports
+        namespace = {
+            '__name__': '__main__',
+            '__file__': str(notebook_path),
+        }
+        
         stdout_capture = io.StringIO()
         stderr_capture = io.StringIO()
         
         with redirect_stdout(stdout_capture), redirect_stderr(stderr_capture):
             try:
-                exec(source, globals())
+                exec(source, namespace)
             except Exception as e:
+                os.chdir(original_cwd)
                 return f"Error: {str(e)}"
         
+        os.chdir(original_cwd)
+        
         output = stdout_capture.getvalue()
         errors = stderr_capture.getvalue()
         
@@ -213,6 +227,10 @@ def run_notebook_cell(notebook_name: str, cell_number: int) -> str:
         return result
         
     except Exception as e:
+        try:
+            os.chdir(original_cwd)
+        except:
+            pass
         return f"Error: {str(e)}"
 
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