chore: import upstream snapshot with attribution

code/_convenience_scripts/ipynb_toc_links.py

@@ -0,0 +1,14 @@
+# Sebastian Raschka, 2015
+# convenience function for myself to add internal links to IPython toc
+# use as `python ipynb_toc_links.py /blank_tocs/ch01.toc`
+
+import sys
+
+ipynb = sys.argv[1]
+with open(ipynb, 'r') as f:
+    for line in f:
+        out_str = ' ' * (len(line) - len(line.lstrip()))
+        line = line.strip()
+        out_str += '- [%s' % line
+        out_str += '](#%s)' % line.replace(' ', '-')
+        print(out_str)