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

index = count()
x1 = []
y1 = []

def animate(i):
    x1.append(next(index))
    y1.append(random.randint(-5, 12))
    plt.cla()
    plt.plot(x1, y1)


FuncAnimation(plt.gcf(), animate, interval = 1000)

plt.tight_layout()
plt.show()