使用mplcursors点击时出现AttributeError

Question

当我将鼠标悬停在画布上时，用于绘制和标记线条的代码不断出现错误。我什至尝试使用 mplcursors webpage 中的基本示例，并且明显有相同的行为。如果您要运行代码来查看，您可能必须单击一行，然后单击画布的空白部分。

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

data = np.outer(range(10), range(1, 5))

fig, ax = plt.subplots()
lines = ax.plot(data)
ax.set_title("Click somewhere on a line.\nRight-click to deselect.\n"
             "Annotations can be dragged.")

mplcursors.cursor(lines)  # or just mplcursors.cursor()

plt.show()

这是我得到的错误：

H:\>python C:\Users\m312945\Desktop\Paul\Scripts\Cluster\test_animation_test_mp.py
Traceback (most recent call last):
  File "C:\Python39\lib\site-packages\matplotlib\cbook\__init__.py", line 304, in process
    func(*args, **kwargs)
  File "C:\Python39\lib\site-packages\matplotlib\offsetbox.py", line 1550, in on_release
    if self._check_still_parented() and self.got_artist:
  File "C:\Python39\lib\site-packages\matplotlib\offsetbox.py", line 1560, in _check_still_parented
    self.disconnect()
  File "C:\Python39\lib\site-packages\matplotlib\offsetbox.py", line 1568, in disconnect
    self.canvas.mpl_disconnect(cid)
  File "C:\Python39\lib\site-packages\matplotlib\offsetbox.py", line 1517, in <lambda>
    canvas = property(lambda self: self.ref_artist.figure.canvas)
AttributeError: 'NoneType' object has no attribute 'canvas'

Answer 1

• GitHub：matplotlib 问题 25440 指出这是

  matplotlib v3.7.1

  的问题。
• 使用

  matplotlib v3.7.0

  或更新到

  matplotlib v3.7.2

  即可解决该问题。