如何在python中使用mysql查询绘制实时折线图

Question

import pymysql

import pandas as pd

import matplotlib.pyplot as plt

from matplotlib import style

import numpy as np

import matplotlib.animation as animation

style.use("fivethirtyeight")

fig = plt.figure()

ax1 = fig.add_subplot(1,1,1)

db=pymysql.connect("localhost","root","root","bounce")

cursor=db.cursor()

cursor.execute("select day,visitors,bounce_rate from bounce1")

data=cursor.fetchall()

df = pd.read_sql('select day,visitors,bounce_rate from bounce1', con=db)

print(df)

df.set_index("day",inplace=True)

xar = []

yar = []

zar = []

"""for eachLine in df:

    if len(eachLine)>1:

            x,y,z=eachLine.split('')

            xar.append(int(x))

            yar.append(int(y))

            xar.append(int(z))"""

ax1.clear()

ax1.plot(xar,yar,zar)

  #  ani = animation.FuncAnimation(fig, animate, interval=1)


plt.show()

我尝试过此代码，但行未打印