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Plot disappears after executing cell second time

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
jupyter-notebook, matplotlib, python

调研方向

首先,在 JupyterLab 和 Jupyter Notebook 中使用报告的 widget 和 inline 后端重现两个 notebook 单元格示例。比较重复执行绘图单元格的情况,并确认无需重新执行后端选择单元格,基于 widget 的绘图仍保持可见且会按预期重新渲染。

由索引模型根据 Issue 内容生成。

描述

If I have a plot in a notebook cell, and execute it twice, the plot output disappears. This is not what is expected. For example, using this code in one jupyter notebook cell:

%matplotlib widget
import matplotlib.pyplot as plt

and this in another cell:

x = [0, 1, 2, 3]
y = [0, 1, 2, 3]

plt.plot(x, y)

The first time I run this, everything plots fine. But when I execute the second cell twice (or any following calls), the plot disappears. The expected behaviour is that it re-plots (using a different colour). If I then re-run the first cell (with %matplotlib widget), and then the second cell again, it works (but this basically just resets the plot).

If I include a plot command in the first cell, then I can re-run the second cell as many times as I want and it works as expected.

This does not happen if I use %matplotlib inline. I've tested in both jupyter lab and jupyter notebook. My versions are the following:

matplotlib                2.2.2                    py36_1    conda-forge
ipympl                    0.2.1                    py36_0    conda-forge
@jupyter-widgets/jupyterlab-manager
        @jupyter-widgets/jupyterlab-manager v0.35.0  enabled  OK
主要语言
Jupyter Notebook
星标
1.7k
派生
234
PR 合并指标
30 天内没有已合并 PR

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