Now with videos.

Author: dham

doc/source/11_further_object-oriented_features.rst

@@ -10,6 +10,20 @@ in the course so far.
 Decorators
 ----------
 
+.. dropdown:: Video: decorators.
+
+    .. container:: vimeo
+
+        .. raw:: html
+
+            <iframe src="https://player.vimeo.com/video/526946976"
+            frameborder="0" allow="autoplay; fullscreen"
+            allowfullscreen></iframe>
+
+    Imperial students can also `watch this video on Panopto
+    <https://imperial.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=f1d61410-4200-42e5-92c4-acf2011de8ab>`__.
+
+
 In :numref:`Week %s <trees>` we encountered the
 :func:`functools.singledispatch` decorator, which turns a function into a
 :term:`single dispatch function`. More generally, a decorator is a function
@@ -193,6 +207,19 @@ ones. We will survey just a few here:
 Abstract base classes
 ---------------------
 
+.. dropdown:: Video: Abstract base classes.
+
+    .. container:: vimeo
+
+        .. raw:: html
+
+            <iframe src="https://player.vimeo.com/video/526947635"
+            frameborder="0" allow="autoplay; fullscreen"
+            allowfullscreen></iframe>
+
+    Imperial students can also `watch this video on Panopto
+    <https://imperial.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=f4678a69-731c-45fe-bdbf-acf2011de880>`__.
+
 We have now on several occasions encountered classes which are not designed to
 be instantiated themselves, but merely serve as parent classes to concrete
 classes which are intended to be instantiated. Examples of these classes
@@ -363,6 +390,19 @@ second use of abstract base classes comes into play.
 Virtual subclasses
 ~~~~~~~~~~~~~~~~~~
 
+.. dropdown:: Video: virtual subclasses.
+
+    .. container:: vimeo
+
+        .. raw:: html
+
+            <iframe src="https://player.vimeo.com/video/526947427"
+            frameborder="0" allow="autoplay; fullscreen"
+            allowfullscreen></iframe>
+
+    Imperial students can also `watch this video on Panopto
+    <https://imperial.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=4114bb1d-cc31-4cfc-81a6-acf2011de8d6>`__.
+
 We learned in :numref:`Week %s <objects>` that we can determine if a type is a
 number by checking if it is an instance of :class:`numbers.Number`. This is a
 slightly different usage of abstract base classes. Rather than providing part