remove the execution metadata from the notebooks

.gitattributes

@@ -0,0 +1,2 @@
+# based on https://stackoverflow.com/a/73218382/358804
+*.ipynb filter=strip-notebook-execution

extras/lib/clear_execution.py

@@ -0,0 +1,15 @@
+# adapted from
+# https://github.com/jupyter/nbconvert/blob/main/nbconvert/preprocessors/clearmetadata.py
+
+from nbconvert.preprocessors import Preprocessor
+
+
+class ClearExecutionPreprocessor(Preprocessor):
+    """Removes the execution metadata from all code cells in a notebook."""
+
+    def preprocess_cell(self, cell, resources, cell_index):
+        if cell.cell_type == "code" and "metadata" in cell:
+            metadata = cell.metadata
+            if "execution" in metadata:
+                metadata["execution"] = {}
+        return cell, resources

lecture_0.ipynb

@@ -745,10 +745,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-21T02:01:34.277506Z",
-     "iopub.status.busy": "2024-09-21T02:01:34.277165Z",
-     "iopub.status.idle": "2024-09-21T02:01:34.288803Z",
-     "shell.execute_reply": "2024-09-21T02:01:34.288284Z"
+     "iopub.execute_input": "2024-09-21T03:30:34.911251Z",
+     "iopub.status.busy": "2024-09-21T03:30:34.910996Z",
+     "iopub.status.idle": "2024-09-21T03:30:34.922876Z",
+     "shell.execute_reply": "2024-09-21T03:30:34.922419Z"
     },
     "tags": [
      "columbia-only"
@@ -770,7 +770,7 @@
        "        "
       ],
       "text/plain": [
-       "<IPython.lib.display.IFrame at 0x103fe38b0>"
+       "<IPython.lib.display.IFrame at 0x105d5a710>"
       ]
      },
      "execution_count": 1,