python runtime_error ai_generated true

AttributeError: 'NoneType' object has no attribute 'copy_from_bbox'

ID: python/matplotlib-animation-blit-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-07-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Using blitting in animation without properly initializing the background, often because the canvas is not fully rendered before the first frame.

generic

中文

在动画中使用blitting，但未正确初始化背景，通常是因为在第一帧之前画布未完全渲染。

Workarounds

  1. 85% success Initialize the background in the init function 
    def init(): ax.plot([], []); return []; ani = FuncAnimation(fig, update, init_func=init, blit=True)
  2. 90% success Ensure the canvas is drawn before starting animation 
    fig.canvas.draw(); ani = FuncAnimation(fig, update, blit=True)

Dead Ends

Common approaches that don't work:

  1. Disabling blit entirely 30% fail

    This works but may reduce performance; the error is about incorrect setup.

  2. Setting blit=False in FuncAnimation 50% fail

    This avoids the error but doesn't leverage blitting; the root cause remains.