MEP12ify pie and polar chart examples

Author: naoyak

examples/pie_and_polar_charts/pie_demo_features.py

@@ -1,4 +1,8 @@
 """
+===============
+Basic pie chart
+===============
+
 Demo of a basic pie chart plus a few additional features.
 
 In addition to the basic pie chart, this demo shows a few optional features:

examples/pie_and_polar_charts/polar_bar_demo.py

@@ -1,4 +1,8 @@
 """
+=======================
+Pie chart on polar axis
+=======================
+
 Demo of bar plot on a polar axis.
 """
 import numpy as np
@@ -7,6 +11,7 @@
 # Fixing random state for reproducibility
 np.random.seed(19680801)
 
+# Compute pie slices
 N = 20
 theta = np.linspace(0.0, 2 * np.pi, N, endpoint=False)
 radii = 10 * np.random.rand(N)

examples/pie_and_polar_charts/polar_scatter_demo.py

@@ -1,4 +1,8 @@
 """
+==========================
+Scatter plot on polar axis
+==========================
+
 Demo of scatter plot on a polar axis.
 
 Size increases radially in this example and color increases with angle
@@ -10,15 +14,14 @@
 # Fixing random state for reproducibility
 np.random.seed(19680801)
 
-
+# Compute areas and colors
 N = 150
 r = 2 * np.random.rand(N)
 theta = 2 * np.pi * np.random.rand(N)
 area = 200 * r**2
 colors = theta
 
 ax = plt.subplot(111, projection='polar')
-c = ax.scatter(theta, r, c=colors, s=area, cmap=plt.cm.hsv)
-c.set_alpha(0.75)
+c = ax.scatter(theta, r, c=colors, s=area, cmap='hsv', alpha=0.75)
 
 plt.show()