Merge pull request #4496 from takluyver/i4495

Pass nbformat object to write call to save .py script

Closes  #4495

IPython/html/services/notebooks/filenbmanager.py

@@ -251,7 +251,7 b' class FileNotebookManager(NotebookManager):'
             self.log.debug("Writing script %s", py_path)
             try:
                 with io.open(py_path, 'w', encoding='utf-8') as f:
-                    current.write(model, f, u'py')
+                    current.write(nb, f, u'py')
             except Exception as e:
                 raise web.HTTPError(400, u'Unexpected error while saving notebook as script: %s %s' % (py_path, e))
 

IPython/html/services/notebooks/tests/test_nbmanager.py

@@ -196,6 +196,25 b' class TestNotebookManager(TestCase):'
             self.assertEqual(model['name'], 'Untitled0.ipynb')
             self.assertEqual(model['path'], sub_dir.strip('/'))
 
+    def test_save_notebook_with_script(self):
+        with TemporaryDirectory() as td:
+            # Create a notebook
+            nm = FileNotebookManager(notebook_dir=td)
+            nm.save_script = True
+            model = nm.create_notebook_model()
+            name = model['name']
+            path = model['path']
+
+            # Get the model with 'content'
+            full_model = nm.get_notebook_model(name, path)
+
+            # Save the notebook
+            model = nm.save_notebook_model(full_model, name, path)
+
+            # Check that the script was created
+            py_path = os.path.join(td, os.path.splitext(name)[0]+'.py')
+            assert os.path.exists(py_path), py_path
+
     def test_delete_notebook_model(self):
         with TemporaryDirectory() as td:
             # Test in the root directory