Pre-matrix rewrite of chapter 11

animation/simple_animations.py

@@ -68,7 +68,7 @@ class Write(ShowCreation):
         if "run_time" not in kwargs:
             self.establish_run_time(mobject)
         if "lag_factor" not in kwargs:
-            self.lag_factor = max(self.run_time - 1, 1)
+            self.lag_factor = max(self.run_time - 1, 2)
         ShowCreation.__init__(self, mobject, **kwargs)
 
     def establish_run_time(self, mobject):

eola/matrix.py

@@ -83,7 +83,7 @@ class Matrix(VMobject):
         return np.array([
             map(TexMobject, row)
             for row in matrix
-        ])
+        ]).reshape(matrix.shape)
 
     def organize_mob_matrix(self, matrix):
         for i, row in enumerate(matrix):

mobject/mobject.py

@@ -497,6 +497,9 @@ class Mobject(object):
     def __iter__(self):
         return iter(self.split())
 
+    def __len__(self):
+        return len(self.split())
+
     def split(self):
         result = [self] if len(self.points) > 0 else []
         return result + self.submobjects

topics/characters.py

@@ -364,7 +364,7 @@ class TeacherStudentsScene(Scene):
                          **bubble_kwargs):
         if all(map(lambda s : isinstance(s, str), content)):
             content = TextMobject(*content)
-        elif len(content) == 1 and isinstance(content[0], TexMobject):
+        elif len(content) == 1 and isinstance(content[0], Mobject):
             content = content[0]
         else:
             raise Exception("Invalid content type")
@@ -379,7 +379,7 @@ class TeacherStudentsScene(Scene):
                 pi_creature_target_mode = "pondering"
 
         for p in self.get_everyone():
-            if p.bubble and p is not pi_creature:
+            if (p.bubble is not None) and (p is not pi_creature):
                 added_anims += [
                     FadeOut(p.bubble),
                     FadeOut(p.bubble.content)