realtime_mpl.py

#! /usr/bin/python3
from time import sleep

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.axes import Axes
from matplotlib.figure import Figure
from matplotlib.lines import Line2D


def main():
    f: Figure
    ax: Axes
    f, ax = plt.subplots()

    x = np.linspace(0, 10, 10)
    y = 0 * x

    pdata = ax.plot(x, y)
    line: Line2D = pdata[0]
    plt.pause(0.01)

    ax.set_xlim(0, 10)
    ax.set_ylim(0, 10 * 10)

    for m in range(10):
        print(f"Slope: {m}")

        line.set_ydata(m * x)

        f.canvas.draw()
        f.canvas.flush_events()
        plt.pause(0.01)  # For letting us click and zoom on plot

        sleep(1)


if __name__ == '__main__':
    main()