Several import fixes

camera/three_d_camera.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 import numpy as np
 
 from constants import *

mobject/geometry.py

@@ -631,7 +631,12 @@ class Vector(Arrow):
 
 class DoubleArrow(Arrow):
     def init_tip(self):
-        self.tip = [(self.add_tip(), True), (self.add_tip(add_at_end = False), False)]
+        self.tip = VGroup()
+        for b in True, False:
+            t = self.add_tip(add_at_end = b)
+            t.add_at_end = b
+            self.tip.add(t)
+        self.tip.match_style(self.tip[0])
 
 class CubicBezier(VMobject):
     def __init__(self, points, **kwargs):

mobject/matrix.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 import numpy as np
 
 from mobject.mobject import Mobject

mobject/probability.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 from constants import *
 
 from mobject.mobject import Mobject

mobject/three_dimensions.py

@@ -1,7 +1,9 @@
+from __future__ import absolute_import
+
 from constants import *
 
-from mobject.vectorized_mobject import VMobject
-from topics.geometry import Square
+from mobject.types.vectorized_mobject import VMobject
+from mobject.geometry import Square
 
 from utils.space_ops import z_to_vector
 

once_useful_constructs/light.py

@@ -2,6 +2,7 @@ from constants import *
 
 from mobject.geometry import AnnularSector
 from mobject.geometry import Arc
+from mobject.geometry import Annulus
 from mobject.mobject import Mobject
 from mobject.svg.svg_mobject import SVGMobject
 from mobject.svg.tex_mobject import TexMobject

scene/three_d_scene.py

@@ -1,10 +1,11 @@
+from __future__ import absolute_import
 
 from constants import *
 
 from continual_animation.continual_animation import ContinualMovement
 from animation.transform import ApplyMethod
 from camera.three_d_camera import ThreeDCamera
-from mobject.vectorized_mobject import VGroup
+from mobject.types.vectorized_mobject import VGroup
 from mobject.three_dimensions import should_shade_in_3d
 from scene.scene import Scene
 

scene/vector_space_scene.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 import numpy as np
 
 from constants import *

utils/color.py

@@ -2,8 +2,8 @@ import numpy as np
 import random
 
 from colour import Color
-from colour import WHITE
-from colour import PALETTE
+from constants import WHITE
+from constants import PALETTE
 
 from utils.bezier import interpolate