matplotlib绘制饼图

1.源代码

#coding=utf-8

import numpy as np;
import matplotlib.pyplot as plt;
import math;

fig = plt.figure(figsize=(4,4))

ax = fig.add_subplot(111);

#c=seaborn.xkcd_rgb['baby poop green']

langs = ['N2','O2','OTHER']

students = [78,21,1]

ax.pie(students, labels=langs, autopct='%1.2f%%') #绘制饼图

plt.savefig('pie.png');

2.运行程序

$ python pie.py

3.绘制结果

pie.png