From d1647d32efb6cd05b9978eced0b577a084762845 Mon Sep 17 00:00:00 2001
From: Sridhar Ramesh <sridhar@3blue1brown.com>
Date: Mon, 29 Jan 2018 13:37:17 -0800
Subject: [PATCH] Whoops, forgot to actually add Container files to last
 commit, but this is the purely virtual Container class from which MObject and
 Scene now derive

---
 container/__init__.py  |  1 +
 container/container.py | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 container/__init__.py
 create mode 100644 container/container.py

diff --git a/container/__init__.py b/container/__init__.py
new file mode 100644
index 00000000..de599d96
--- /dev/null
+++ b/container/__init__.py
@@ -0,0 +1 @@
+from container import *
diff --git a/container/container.py b/container/container.py
new file mode 100644
index 00000000..2cb3325e
--- /dev/null
+++ b/container/container.py
@@ -0,0 +1,21 @@
+from helpers import *
+
+# Currently, this is only used by both Scene and MOBject.
+# Still, we abstract its functionality here, albeit purely nominally.
+# All actual implementation has to be handled by derived classes for now.
+#
+# Note that although the prototypical instances add and remove MObjects, 
+# there is also the possibility to add ContinualAnimations to Scenes. Thus, 
+# in the Container class in general, we do not make any presumptions about 
+# what types of objects may be added; this is again dependent on the specific
+# derived instance.
+
+class Container(object):
+    def __init__(self, *submobjects, **kwargs):
+        digest_config(self, kwargs)
+
+    def add(self, *items):
+    	raise Exception("Container.add is not implemented; it is up to derived classes to implement")
+
+    def remove(self, *items):
+    	raise Exception("Container.remove is not implemented; it is up to derived classes to implement")
\ No newline at end of file