new jupyter and django orm resources

mattmakai · mattmakai · commit 3c2c89f811ca · 2020-03-19T16:38:46.000-04:00
diff --git a/content/pages/02-development-environments/06-jupyter-notebook.markdown b/content/pages/02-development-environments/06-jupyter-notebook.markdown
@@ -77,6 +77,9 @@ your own productive workflow.
   is a high-level overview post that starts a series on Jupyter Notebooks.
   This first post covers why a tool like Jupyter Notebook is needed in
   the broader landscape of data science.
+  [Part 2](https://ljvmiranda921.github.io/notebook/2020/03/16/jupyter-notebooks-in-2020-part-2/)
+  examines the growth of the Jupyter ecosystem and the jump from exploratory
+  analysis notebooks to production notebooks.
 
 * [How to Version Control Jupyter Notebooks](https://nextjournal.com/schmudde/how-to-version-control-jupyter)
   explains how Jupyter Notebooks are stored in JSON, the issues with that
diff --git a/content/pages/03-data/08-django-orm.markdown b/content/pages/03-data/08-django-orm.markdown
@@ -182,3 +182,9 @@ following resources should get you past the initial hurdles.
   Django ORM with [PostgreSQL](/postgresql.html), which is useful
   when you want to prevent multiple processes from accessing the same
   data at the same time.
+
+* [Using Django Check Constraints for the Sum of Percentage Fields](https://adamj.eu/tech/2020/03/10/django-check-constraints-sum-percentage-fields/)
+  shows how you can combine several `PositiveIntegerField` model
+  fields with a checking constraint and a web form that ensures
+  all of the fields sum up to a precise amount, such as 100%.
+
