diff --git a/doc/examples/plot_shapes.py b/doc/examples/plot_shapes.py
index 04882068..995a278a 100644
--- a/doc/examples/plot_shapes.py
+++ b/doc/examples/plot_shapes.py
@@ -15,16 +15,15 @@ import numpy as np
 import matplotlib.pyplot as plt
 
 from skimage.draw import line, polygon, circle, \
-                         circle_perimeter, circle_perimeter_aa, \
+                         circle_perimeter, \
                          ellipse, ellipse_perimeter
-import numpy as np
 import math
 
 img = np.zeros((500, 500, 3), dtype=np.uint8)
 
 # draw line
 rr, cc = line(120, 123, 20, 400)
-img[rr,cc,0] = 255
+img[rr, cc, 0] = 255
 
 # fill polygon
 poly = np.array((
@@ -34,16 +33,16 @@ poly = np.array((
     (220, 590),
     (300, 300),
 ))
-rr, cc = polygon(poly[:,0], poly[:,1], img.shape)
-img[rr,cc,1] = 255
+rr, cc = polygon(poly[:, 0], poly[:, 1], img.shape)
+img[rr, cc, 1] = 255
 
 # fill circle
 rr, cc = circle(200, 200, 100, img.shape)
-img[rr,cc,:] = (255, 255, 0)
+img[rr, cc, :] = (255, 255, 0)
 
 # fill ellipse
 rr, cc = ellipse(300, 300, 100, 200, img.shape)
-img[rr,cc,2] = 255
+img[rr, cc, 2] = 255
 
 # circle
 rr, cc = circle_perimeter(120, 400, 15)
@@ -73,7 +72,6 @@ import matplotlib.pyplot as plt
 
 from skimage.draw import line_aa, \
                          circle_perimeter_aa
-import numpy as np
 
 img = np.zeros((100, 100), dtype=np.uint8)