ipython notebook 在代码中清除单元格输出
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ipython notebook clear cell output in code
提问by aha
In a iPython notebook, I have a while loop that listens to a Serial port and printthe received data in real time.
在 iPython 笔记本中，我有一个 while 循环，它print实时侦听串行端口和接收到的数据。
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)
我想要实现的仅显示最新接收到的数据（即只有一行显示最新数据。在单元格输出区域中没有滚动）
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 ?
我需要（我认为）是在收到新数据时清除旧单元格输出，然后打印新数据。我想知道如何以编程方式清除旧数据？
采纳答案by cel
You can use IPython.display.clear_outputto clear the output of a cell.
您可以使用IPython.display.clear_output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!")
At the end of this loop you will only see one Hello World!.
在此循环结束时，您只会看到一个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.
如果没有代码示例，就不容易为您提供工作代码。可能缓冲最近的 n 个事件是一个很好的策略。每当缓冲区发生变化时，您都可以清除单元格的输出并再次打印缓冲区。
回答by marzetti
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:
如果您像我一样来到这里，希望在 Jupyter 的 Julia 笔记本中使用 Plots 对绘图执行相同的操作，您可以使用：
IJulia.clear_output(true)
so for a kind of animated plot of multiple runs
所以对于一种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
Without the clear_output call, all plots appear separately.
如果没有 clear_output 调用，所有图都单独显示。
回答by hof.and.or
You can use the IPython.display.clear_outputto 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:
您可以使用IPython.display.clear_output清除 cel 回答中提到的输出。我想补充一点，对我来说最好的解决方案是使用这种参数组合进行打印，而不会出现笔记本的任何“抖动”：
from IPython.display import clear_output
for i in range(10):
clear_output(wait=True)
print(i, flush=True)
