Merge pull request matplotlib#4356 from mscross/examples_streamplot_feat

STY : update streamplot_demo_features.py style

Author: tacaswell

examples/images_contours_and_fields/streamplot_demo_features.py

@@ -16,13 +16,14 @@
 V = 1 + X - Y**2
 speed = np.sqrt(U*U + V*V)
 
-plt.streamplot(X, Y, U, V, color=U, linewidth=2, cmap=plt.cm.autumn)
-plt.colorbar()
+fig0, ax0 = plt.subplots()
+strm = ax0.streamplot(X, Y, U, V, color=U, linewidth=2, cmap=plt.cm.autumn)
+fig0.colorbar(strm.lines)
 
-f, (ax1, ax2) = plt.subplots(ncols=2)
+fig1, (ax1, ax2) = plt.subplots(ncols=2)
 ax1.streamplot(X, Y, U, V, density=[0.5, 1])
 
-lw = 5*speed/speed.max()
+lw = 5*speed / speed.max()
 ax2.streamplot(X, Y, U, V, density=0.6, color='k', linewidth=lw)
 
 plt.show()