如何更新窗口中显示的matplotlib图表?

我试图写一个每0.5秒更新一次的样本图表。

代码是这样的:

import matplotlib.pyplot as plt
import numpy as np
import time

# Some example data to display
x = np.linspace(0, 2 * np.pi, 400)
y = np.sin(x ** 2)

fig, axs = plt.subplots(2, 2)

i = 5
for row in x:
    axs[0, 0].plot(x[len(x) - i:], y[len(y) - i:])
    axs[0, 0].set_title("main")

    axs[1, 0].plot(x, y ** 2)
    axs[1, 0].set_title(f"shares {i} with main")
    axs[1, 0].sharex(axs[0, 0])

    axs[0, 1].plot(x + 1, y + 1)
    axs[0, 1].set_title("unrelated")

    axs[1, 1].plot(x + 2, y + 2)
    axs[1, 1].set_title("also unrelated")

    fig.canvas.draw()
    fig.canvas.flush_events()
    fig.tight_layout()
    i += 1
    plt.show()

    print('THIS NEVER PRINTS - IT SEEMS TO BLOCK ON THE show() CALL ABOVE')
    time.sleep(0.5)

如果运行它,将显示图表。但是 show() 调用似乎被阻塞,循环永远不会执行以更新图表。

我怎样才能更新它?