unplot.py

#https://www.geeksforgeeks.org/dynamically-updating-plot-in-matplotlib/
import matplotlib.pyplot as plt
import random

plt.ion()  # turning interactive mode on

# preparing the data
y = [random.randint(1,10) for i in range(20)]
x = [*range(1,21)]

# plotting the first frame
graph = plt.plot(x,y)[0]
plt.ylim(0,10)
plt.pause(1)

# the update loop
while(True):
    # updating the data
    y.append(random.randint(1,10))
    x.append(x[-1]+1)

    # removing the older graph
    graph.remove()

    # plotting newer graph
    graph = plt.plot(x,y,color = 'g')[0]
    plt.xlim(x[0], x[-1])

    # calling pause function for 0.25 seconds
    plt.pause(0.25)