這是我第一次在這里發帖。我正在運行這段代碼，它是一個 matplotlib（版本 3.2.1）動畫示例，所以它應該可以正常工作。import numpy as npfrom matplotlib import pyplot as pltfrom matplotlib import animationplt.rcParams['animation.ffmpeg_path'] = '/opt/local/bin/ffmpeg'# First set up the figure, the axis, and the plot element we want to animatefig = plt.figure()ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))line, = ax.plot([], [], lw=2)# initialization function: plot the background of each framedef init():    line.set_data([], [])    return line# animation function.  This is called sequentiallydef animate(i):    x = np.linspace(0, 2, 1000)    y = np.sin(2 * np.pi * (x - 0.01 * i))    line.set_data(x, y)    return line,# call the animator.  blit=True means only re-draw the parts that have changed.anim = animation.FuncAnimation(fig, animate, init_func=init,                               frames=200, interval=20, blit=True)# save the animation as an mp4.  This requires ffmpeg or mencoder to be# installed.  The extra_args ensure that the x264 codec is used, so that# the video can be embedded in html5.  You may need to adjust this for# your system: for more information, see# http://matplotlib.sourceforge.net/api/animation_api.htmlanim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])plt.show()但是，我收到此錯誤：回溯（最近調用最后）：文件“matplotlib_animation.py”，第 42 行，在 anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264']) 文件“/home /leonardo/.local/lib/python3.6/site-packages/matplotlib/animation.py”，第 1102 行，保存 alt_writer = next(writers, None) TypeError: 'MovieWriterRegistry' object is not an iterator /home/leonardo /.local/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3.py:195: 警告：嘗試刪除源 ID 8 時未找到它 GLib.source_remove(self._idle_draw_id)任何想法將不勝感激。