matplotlib 实现饼图pie和等高线图contourf

饼图

import numpy as np
import matplotlib.pyplot as plt

labels='A','B','C','D'
fracs = [15,30, 45, 10]
explode = [0,0.1,0.05,0]
#长宽比为1:1
plt.axes(aspect=1)
#autopct 控制百分比的设置，使用format字符串或者format function 
#shadow=True添加阴影
#explode 每一块离开中心的距离 突出显示某一块
#labels 饼图外侧显示的说明文字
plt.pie(x=fracs, labels=labels, autopct='%.0f%%', explode=explode, shadow=True) 
plt.show()

等高线图

%matplotlib inline
from matplotlib import pyplot as plt
import numpy as np

def f(x,y):
    return (1 - x / 2 + x**5 + y**3) * np.exp(-x**2 -y**2)

n = 256
x = np.linspace(-3, 3, n)
y = np.linspace(-3, 3, n)
X,Y = np.meshgrid(x, y)


plt.contourf(X, Y, f(X, Y), 8, alpha=.75, cmap=plt.cm.hot)
C = plt.contour(X, Y, f(X, Y), 8, colors='black', linewidth=.5)
plt.clabel(C, inline=1, fontsize=10)

plt.xticks(())
plt.yticks(())