pi_polar.py

#!/bin/env python
# encoding:utf-8
#
#
__Author__  =  "CORDEA"
__date__    =  "2014-09-23"

import numpy as np
import matplotlib.pyplot as plt

pi="14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214"

lst = []
ind = []
for n in range(len(pi)):
    lst.append(int(pi[n]))
    ind.append(int(n+1))

lst = np.array(lst)
ind = np.array(ind)

r      = 2 * ind
theta  = (np.pi * ind) / 10
area   = 120 * lst * (ind * 0.012)
colors = theta

ax = plt.subplot(111, polar=True)
c  = plt.scatter(theta, r, c=colors, s=area, cmap=plt.cm.hsv, edgecolors='#636363')
c.set_alpha(0.75)

ax.spines['polar'].set_visible(False)
ax.axes.get_xaxis().set_visible(False)
ax.axes.get_yaxis().set_visible(False)

plt.show()