matplotlib画图

#coding：utf-8
import matplotlib.pyplot as plt
fig  = plt.figure()
ax = fig.add_subplot(111)
#创建矩形
rect = plt.Rectangle((0.3,0.6),0.2,0.4,color='y',alpha = 0.3)
#(0.3,0.6)为左下角坐标，0.2,0.4为长宽，color='y'为矩形的填充色，alpha = 0.3为透明度
ax.add_patch(rect)
#添加到图形中

circ = plt.Circle((0.7,0.3),0.15,color = 'b',alpha = 0.8)
ax.add_patch(circ)

pgon = plt.Polygon([[0.15,0.15],[0.35,0.4],[0.2,0.6]],color = 'g',alpha = 0.5)
ax.add_patch(pgon)