Populate notebook metadata when exporting with %notebook magic

krassowski · krassowski · commit 2d1c243db8fa · 2025-08-07T13:50:47.000+01:00
diff --git a/IPython/core/magics/basic.py b/IPython/core/magics/basic.py
@@ -4,6 +4,7 @@
 from logging import error
 import io
 import os
+import platform
 from pprint import pformat
 import sys
 from warnings import warn
@@ -603,7 +604,28 @@ def notebook(self, s):
                 )
             cells.append(cell)
 
-        nb = v4.new_notebook(cells=cells)
+        nb = v4.new_notebook(
+            cells=cells,
+            metadata={
+                "kernelspec": {
+                    "display_name": "Python 3 (ipykernel)",
+                    "language": "python",
+                    "name": "python3",
+                },
+                "language_info": {
+                    "codemirror_mode": {
+                        "name": "ipython",
+                        "version": 3
+                    },
+                    "file_extension": ".py",
+                    "mimetype": "text/x-python",
+                    "name": "python",
+                    "nbconvert_exporter": "python",
+                    "pygments_lexer": "ipython3",
+                    "version": platform.python_version()
+                }
+            }
+        )
         with io.open(outfname, "w", encoding="utf-8") as f:
             write(nb, f, version=4)
 
diff --git a/tests/test_magic.py b/tests/test_magic.py
@@ -3,7 +3,9 @@
 
 import gc
 import io
+import json
 import os
+import platform
 import re
 import shlex
 import signal
@@ -928,6 +930,17 @@ def test_notebook_export_json():
     with TemporaryDirectory() as td:
         outfile = os.path.join(td, "nb.ipynb")
         _ip.run_line_magic("notebook", "%s" % outfile)
+        with open(outfile) as f:
+            exported = json.load(f)
+
+    # check metadata
+    language_info = exported["metadata"]["language_info"]
+    assert language_info["name"] == "python"
+    assert language_info["file_extension"] == ".py"
+    assert language_info["version"] == platform.python_version()
+
+    kernelspec = exported["metadata"]["kernelspec"]
+    assert kernelspec["language"] == "python"
 
 
 def test_notebook_export_json_with_output():
