From 9df8b0781eec971dcdeaaf983cb3c876b61d3c47 Mon Sep 17 00:00:00 2001
From: Sridhar Ramesh <sridhar@3blue1brown.com>
Date: Mon, 29 Jan 2018 13:44:16 -0800
Subject: [PATCH] Some convenient utility functions added to helpers.py, which
 I had reason to make use of previously

---
 camera/camera.py | 5 -----
 helpers.py       | 8 +++++++-
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/camera/camera.py b/camera/camera.py
index f5a6f09a..15ff6400 100644
--- a/camera/camera.py
+++ b/camera/camera.py
@@ -438,11 +438,6 @@ class MappingCamera(Camera):
             excluded_mobjects = None,
         )
 
-# TODO: Put this in different utility/helpers file? Convenient for me (Sridhar); I like it.
-class DictAsObject(object):
-    def __init__(self, dict):
-         self.__dict__ = dict
-
 # Note: This allows layering of multiple cameras onto the same portion of the pixel array,
 # the later cameras overwriting the former
 #
diff --git a/helpers.py b/helpers.py
index 85ad584e..58cfc7c8 100644
--- a/helpers.py
+++ b/helpers.py
@@ -629,6 +629,12 @@ def angle_of_vector(vector):
         return 0
     return np.angle(complex(*vector[:2]))
 
+def concatenate_lists(*list_of_lists):
+    return [item for l in list_of_lists for item in l]
 
-
+# Occasionally convenient in order to write dict.x instead of more laborious 
+# (and less in keeping with all other attr accesses) dict["x"]
+class DictAsObject(object):
+    def __init__(self, dict):
+         self.__dict__ = dict