Creating Pie Charts
With Pyplot, you can use the pie() function to draw pie charts:
Example
A simple pie chart:
import matplotlib.pyplot as plt
import numpy as np
y = np.array([35, 25, 25, 15])
plt.pie(y)
plt.show()
As you can see the pie chart draws one piece (called a wedge) for each value in the array (in this case [35, 25, 25, 15]).
By default the plotting of the first wedge starts from the x-axis and moves counterclockwise:
Note: The size of each wedge is determined by comparing the value with all the other values, by using this formula:
The value divided by the sum of all values: x/sum(x)