如何在Python/Jupyter笔记本中省略matplotlib打印输出? [英] How do I omit matplotlib printed output in Python / Jupyter notebook?

问题描述

当我在IPython/Jupyter笔记本中进行简单绘图时，会显示打印输出，大概是从matplotlib标准输出生成的.例如，如果我运行以下简单脚本，则笔记本将打印如下一行:<matplotlib.text.Text at 0x115ae9850>.

When I make a simple plot inside an IPython / Jupyter notebook, there is printed output, presumably generated from matplotlib standard output. For example, if I run the simple script below, the notebook will print a line like: <matplotlib.text.Text at 0x115ae9850>.

import random
import pandas as pd
%matplotlib inline

A = [random.gauss(10, 5) for i in range(20) ]
df = pd.DataFrame( { 'A': A} ) 
axis = df.A.hist()
axis.set_title('Histogram', size=20)

如下图所示，即使我没有print，也不会出现输出.如何删除或阻止该行?

As you can see in the figure below, the output appears even though I didn't print anything. How can I remove or prevent that line?

推荐答案

之所以发生此输出，是因为Jupyter自动打印了单元格中最后一个对象的表示.在这种情况下，输入单元#1的最后一行确实存在一个对象.这是对.set_title(...)的调用的返回值，这是类型为.Text的实例.该实例返回到笔记本的全局名称空间，并因此被打印.

This output occures since Jupyter automatically prints a representation of the last object in a cell. In this case there is indeed an object in the last line of input cell #1. That is the return value of the call to .set_title(...), which is an instance of type .Text. This instance is returned to the global namespace of the notebook and is thus printed.

为避免此行为，您可以按照注释中的建议，通过在行的末尾添加分号来禁止输出:

To avoid this behaviour, you can, as suggested in the comments, suppress the output by appending a semicolon to the end of the line:

axis.set_title('Histogram', size=20);

另一种方法是将Text分配给变量，而不是将其返回到笔记本.因此，

The other approach would assign the Text to variable istead of returning it to the notebook. Thus,

my_text = axis.set_title('Histogram', size=20)

也解决了这个问题.

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