import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
from itertools import count
import random

xcord = []
ycord = [5]

index = count()
xcord.append(next(index))

def animate(i):
    xcord.append(next(index))
    ycord.append(random.randint(0,5))
    plt.cla()
    plt.plot(xcord,ycord) 
    
fig, ax = plt.subplots(1,1)
print(xcord)
print(ycord)
ani = FuncAnimation(fig,animate,interval=1000)
plt.tight_layout()
plt.show()

Output:
runfile('D:/PJV/IT Reboot/matplotlibtest.py', wdir='D:/PJV/IT Reboot')
[0]
[5]