知识问答

iPython Notebook清除代码中的单元格输出

内容 隐藏
问题：iPython Notebook清除代码中的单元格输出
回答 0
回答 1
回答 2

问题：iPython Notebook清除代码中的单元格输出

在iPython笔记本中，我有一个while循环，可print实时侦听串行端口和接收到的数据。

我想要实现的仅显示最新接收到的数据（即，仅一行显示最新数据。在单元格输出区域中不滚动）

我需要的是（我认为）当我收到新数据时清除旧的单元格输出，然后打印新数据。我想知道如何以编程方式清除旧数据？

点击查看英文原文

In a iPython notebook, I have a while loop that listens to a Serial port and print the received data in real time.

What I want to achieve to only show the latest received data (i.e only one line showing the most recent data. no scrolling in the cell output area)

What I need(i think) is to clear the old cell output when I receives new data, and then prints the new data. I am wondering how can I clear old data programmatically ?

回答 0

您可以IPython.display.clear_output用来清除单元格的输出。

from IPython.display import clear_output

for i in range(10):
    clear_output(wait=True)
    print("Hello World!")

在此循环结束时，您只会看到一个Hello World!。

没有代码示例，给您工作代码并不容易。最好缓冲最近的n个事件是一个好策略。每当缓冲区更改时，您都可以清除单元格的输出并再次打印缓冲区。

点击查看英文原文

You can use IPython.display.clear_output to clear the output of a cell.

from IPython.display import clear_output

for i in range(10):
    clear_output(wait=True)
    print("Hello World!")

At the end of this loop you will only see one Hello World!.

Without a code example it’s not easy to give you working code. Probably buffering the latest n events is a good strategy. Whenever the buffer changes you can clear the cell’s output and print the buffer again.

回答 1

如果您像我一样来到这里，希望使用Jupitter在Jupyter的Julia笔记本中对地块做同样的事情，则可以使用：

    IJulia.clear_output(true)

所以对于多次运行的动画情节

    if nrun==1  
      display(plot(x,y))         # first plot
    else 
      IJulia.clear_output(true)  # clear the window (as above)
      display(plot!(x,y))        # plot! overlays the plot
    end

没有clear_output调用，所有图将单独显示。

点击查看英文原文

And in case you come here, like I did, looking to do the same thing for plots in a Julia notebook in Jupyter, using Plots, you can use:

    IJulia.clear_output(true)

so for a kind of animated plot of multiple runs

    if nrun==1  
      display(plot(x,y))         # first plot
    else 
      IJulia.clear_output(true)  # clear the window (as above)
      display(plot!(x,y))        # plot! overlays the plot
    end

Without the clear_output call, all plots appear separately.

回答 2

您可以使用IPython.display.clear_output清除输出，如cel的答案所述。我要补充一点，对我而言，最好的解决方案是使用以下参数组合进行打印，而不会出现笔记本的“晃动”：

from IPython.display import clear_output

for i in range(10):
    clear_output(wait=True)
    print(i, flush=True)
点击查看英文原文

You can use the IPython.display.clear_output to clear the output as mentioned in cel’s answer. I would add that for me the best solution was to use this combination of parameters to print without any “shakiness” of the notebook:

from IPython.display import clear_output

for i in range(10):
    clear_output(wait=True)
    print(i, flush=True)