%matplotlib notebook
import tensorflow as tf 
import numpy as np 
import matplotlib.pyplot as plt
from matplotlib import animation
fig, ax = plt.subplots()
x =np.arange(0,2*np.pi,0.01)
# 返回的是个列表
line , = ax.plot(x,np.sin(x))
def animate(i):
  # xdata 保持不变， ydata 更新成另外一批数据
  # 将0-100都传进去更新一下，i变化时，y也会变化，更新图像
  line.set_ydata(np.sin(x+i/10))
  return line,

def init():
  line.set_ydata(np.sin(x))
  return line,

# interval 是更新的频率，隔多少毫秒更新一次，这里是隔20ms更新一次
# blit=True,只更新有变化的点
ani = animation.FuncAnimation(fig=fig,func=animate,frames =100,init_func=init,interval =20,blit=False)
plt.show()