bug_matplotlib_threading.py

import random
import time
import threading
import matplotlib.pyplot as plt


class Plot:

    def __init__(self):
        plt.ion()
        plt.show()
        self.xdata = []
        self.ydata = []
        self.running = None
        self.axis = plt.figure().add_subplot(111)
        self.line, = self.axis.plot([])

    def start(self):
        self.running = True
        threading.Thread(target=self.worker).start()
        while self.running:
            self.axis.set_xlim(0, len(self.xdata))
            self.axis.set_ylim(0, max(self.ydata))
            self.line.set_data(self.xdata, self.ydata)
            plt.draw()
            plt.pause(0.001)
            time.sleep(1)

    def worker(self):
        for _ in range(100):
            self.xdata.append(len(self.xdata))
            self.ydata.append(random.random())
            time.sleep(0.1)
        self.running = False


if __name__ == '__main__':
    start = time.time()
    Plot().start()
    print(time.time() - start)