Update app.py

app.py

@@ -23,20 +23,18 @@ def prepare_molecule_for_viewer(traj_path):
         # Debug info
         print(f"Preparing viewer: {len(traj)} frames, {len(traj[-1])} atoms")
         
-        # Save last frame as PDB for Molecule3D
-        temp_pdb = tempfile.NamedTemporaryFile(suffix='.pdb', delete=False)
-        write(temp_pdb.name, traj[-1], format='pdb')
+        # Crear PDB temporal persistente (no se elimina automáticamente)
+        temp_pdb = tempfile.NamedTemporaryFile(suffix='.pdb', delete=False, mode='w')
         
-        # Verify PDB was created
+        # Escribir contenido PDB
+        atoms = traj[-1]
+        write(temp_pdb.name, atoms, format='pdb')
+        temp_pdb.close()  # Cerrar el archivo para que se pueda leer
+        
+        # Verificar que el archivo se creó
         if os.path.exists(temp_pdb.name):
             file_size = os.path.getsize(temp_pdb.name)
             print(f"PDB created: {temp_pdb.name}, size: {file_size} bytes")
-            
-            # Read first few lines to verify content
-            with open(temp_pdb.name, 'r') as f:
-                first_lines = f.read(200)
-                print(f"PDB content preview: {first_lines[:100]}...")
-            
             return temp_pdb.name
         else:
             print("PDB file was not created")