from pylab import *

# make a exploded pie chart
# make a square figure and axes
figure(1, figsize=(6,6))
ax = axes([0.1,0.1,0.8,0.8])

# the slices will be ordered and plotted counter-clockwise
labels = 'Spring', 'Summer', 'Autumn', 'Winter'

# fractions are either x/sum(x) or x if sum(x) <= 1
x = [15, 30, 45, 10]

# explode must be len(x) sequence or None
explode = (0.1,0.1,0.1,0.1)

pie(x, explode=explode, labels=labels,autopct='%1.1f%%', startangle=67)

title('Rainy days by season')

show()