Matplotlib图未显示在Jupyter笔记本第一个单元格的输出小部件中 [英] Matplotlib figure not showing up in output widget in first cell of Jupyter notebook

问题描述

在Jupyter笔记本的第一个单元格中有以下代码段:

I have the following snippet in the first cell of a Jupyter notebook:

import matplotlib.pyplot as plt
import pandas as pd
import ipywidgets as widgets
import numpy as np

out = widgets.Output()
data = pd.DataFrame(np.random.normal(size = 50))
plt.ioff()
with out:
    fig, axes = plt.subplots()
    data.hist(ax = axes)
    display(fig)
plt.ion()    
display(out)

如果我重新启动内核并运行第一个单元，则会看到以下输出:

If I restart the kernel and run this first cell, I see this output:

<Figure size 640x480 with 1 Axes>

但是，如果我在 second 时间内运行此第一个单元格，则会看到预期的matplotlib图形.如果在将matplotlib导入后将所有内容移动到第二个单元格，重新启动内核，然后重新运行整个笔记本，也会显示此行为.

However, if I run this first cell a second time, I see a matplotlib figure as I intended. This behavior also shows up if I move everything after the import of matplotlib to a second cell, restart the kernel, and rerun the entire notebook.

这种行为上的差异是故意的吗?

Is this difference in behavior intentional?

推荐答案

重新排列并添加魔术命令'％matplotlib notebook'的代码对我有用.

The code rearranging and adding magic command '%matplotlib notebook' work for me.

%matplotlib notebook
import matplotlib.pyplot as plt
import pandas as pd
import ipywidgets as widgets
import numpy as np

out = widgets.Output()

plt.ioff()
fig, axes = plt.subplots()
plt.ion()

data = pd.DataFrame(np.random.normal(size = 50))
data.hist(ax = axes)

display(out)

with out:
    display(fig)

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