python runtime_error ai_generated true

AttributeError: 'FigureCanvasAgg' object has no attribute 'tostring_rgb'

ID: python/matplotlib-tostring-rgba-deprecated

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-12-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.10 active — — —

Root Cause

Matplotlib 3.10 removed the deprecated tostring_rgb / tostring_argb methods from canvas objects.

generic

中文

Matplotlib 3.10 移除了 canvas 对象上已弃用的 tostring_rgb / tostring_argb 方法。

Workarounds

  1. 94% success 
    canvas.draw()
buf = canvas.buffer_rgba()
import numpy as np
arr = np.asarray(buf)  # (H, W, 4) uint8
  2. 92% success 
    from io import BytesIO
import numpy as np
from PIL import Image
buf = BytesIO()
fig.savefig(buf, format='png')
buf.seek(0)
arr = np.array(Image.open(buf))

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Pins the project to an unsupported version and breaks other dependencies that require 3.10+.

  2. 75% fail

    Returns None and then the downstream code raises a different error.