Centered bubble chart

bubble.py

import matplotlib.pyplot as plt
from matplotlib.patches import Circle
import numpy as np

plt.figure()
s = [ 50000.,10478.2, 4733.4,3185.3,2484.7,2310.9]
for s_ in s:
    radius = np.sqrt(s_)/np.pi
    plt.gca().add_patch(Circle((1, radius), radius))
plt.ylim(0, 150)
plt.axes().set_aspect('equal', 'datalim')
plt.show()