在cmd中，输入python -m pip install matplotlib进行自动的安装，系统会自动下载安装包

转自：https://blog.csdn.net/zzx2016zzx/article/details/83099583

画图：
1.

import matplotlib.pyplot as plt
labels='frogs','hogs','dogs','logs'
sizes=15,20,45,10
colors='yellowgreen','gold','lightskyblue','lightcoral'
explode=0,0.1,0,0
plt.pie(sizes,explode=explode,labels=labels,colors=colors,autopct='%1.1f%%',shadow=True,startangle=50)
plt.axis('equal')
plt.show()

2.

import matplotlib.pyplot as plt
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
plt.show()