diff --git a/doc/examples/plot_shapes.py b/doc/examples/plot_shapes.py
index f44a989d..507452ef 100644
--- a/doc/examples/plot_shapes.py
+++ b/doc/examples/plot_shapes.py
@@ -19,7 +19,7 @@ from skimage.draw import line, polygon, circle, circle_perimeter, \
 import numpy as np
 import math
 
-img = np.zeros((500, 500, 3), 'uint8')
+img = np.zeros((500, 500, 3), dtype=np.uint8)
 
 # draw line
 rr, cc = line(120, 123, 20, 400)
@@ -49,11 +49,11 @@ rr, cc = circle_perimeter(120, 400, 15)
 img[rr, cc, :] = (255, 0, 0)
 
 # ellipses
-rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=math.pi/4.)
+rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=math.pi / 4.)
 img[rr, cc, :] = (255, 0, 255)
-rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=-math.pi/4.)
+rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=-math.pi / 4.)
 img[rr, cc, :] = (0, 0, 255)
-rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=math.pi/2.)
+rr, cc = ellipse_perimeter(120, 400, 60, 20, orientation=math.pi / 2.)
 img[rr, cc, :] = (255, 255, 255)
 
 plt.imshow(img)
diff --git a/skimage/draw/_draw.pyx b/skimage/draw/_draw.pyx
index eba069be..9cf8f974 100644
--- a/skimage/draw/_draw.pyx
+++ b/skimage/draw/_draw.pyx
@@ -384,16 +384,16 @@ def ellipse_perimeter(Py_ssize_t cy, Py_ssize_t cx, Py_ssize_t yradius,
         iyd = int(floor(ya * w + 0.5))
 
         # Draw the 4 quadrants
-        rr, cc = bezier_segment(iy0+iyd, ix0, iy0, ix0, iy0, ix0+ixd, 1-w)
+        rr, cc = bezier_segment(iy0 + iyd, ix0, iy0, ix0, iy0, ix0 + ixd, 1-w)
         py.extend(rr)
         px.extend(cc)
-        rr, cc = bezier_segment(iy0+iyd, ix0, iy1, ix0, iy1, ix1-ixd, w)
+        rr, cc = bezier_segment(iy0 + iyd, ix0, iy1, ix0, iy1, ix1 - ixd, w)
         py.extend(rr)
         px.extend(cc)
-        rr, cc = bezier_segment(iy1-iyd, ix1, iy1, ix1, iy1, ix1-ixd, 1-w)
+        rr, cc = bezier_segment(iy1 - iyd, ix1, iy1, ix1, iy1, ix1 - ixd, 1-w)
         py.extend(rr)
         px.extend(cc)
-        rr, cc = bezier_segment(iy1-iyd, ix1, iy0, ix1, iy0, ix0+ixd,  w)
+        rr, cc = bezier_segment(iy1 - iyd, ix1, iy0, ix1, iy0, ix0 + ixd,  w)
         py.extend(rr)
         px.extend(cc)
 
@@ -401,9 +401,9 @@ def ellipse_perimeter(Py_ssize_t cy, Py_ssize_t cx, Py_ssize_t yradius,
 
 
 def bezier_segment(Py_ssize_t y0, Py_ssize_t x0,
-                 Py_ssize_t y1, Py_ssize_t x1,
-                 Py_ssize_t y2, Py_ssize_t x2,
-                 double weight):
+                   Py_ssize_t y1, Py_ssize_t x1,
+                   Py_ssize_t y2, Py_ssize_t x2,
+                   double weight):
     """Generate Bezier segment coordinates.
 
     Parameters