python - 每次运行时清除小部件以前的输出

Question

我想在重新运行小部件时清除以前的输出。

例如

from IPython.display import display, clear_output

import ipywidgets as widgets
from datetime import datetime, timedelta

button = widgets.Button(description='RUN',button_style='info')

def on_button_clicked(b):

    # DO SOMETHING #

    out = widgets.Output()
    out.clear_output(wait=True)
    out.append_stdout(f'Ran at {datetime.now()}')
    display(out)

button.on_click(on_button_clicked)
widgets.VBox([button])

每次我单击RUN按钮时，它都会“附加”打印语句

我也尝试过这个:

button = widgets.Button(description='RUN',button_style='info')

def on_button_clicked(b):

    # DO SOMETHING #

    out = widgets.Output()
    out.clear_output(wait=True)
    with out:
        print(f'Ran at {datetime.now()}')
    display(out)

button.on_click(on_button_clicked)
widgets.VBox([button])

Answer 1

这有效

from IPython.display import display, clear_output

import ipywidgets as widgets
from datetime import datetime, timedelta


button = widgets.Button(description='RUN',button_style='info')

out = widgets.Output() 

@out.capture(clear_output=True)
def on_button_clicked(b):
    # DO SOMETHING #
    print ( f'Ran at {datetime.now()}')


button.on_click(on_button_clicked)
widgets.VBox([button])