如何在 jupyter 上使用异步小部件 实验室 ?
我正在尝试重现 the official Asynchronous Widgets-Example在 jupyter 实验室 ,但 await
永远不会继续。
设置/再现
docker run --rm -p 8888:8888 -e JUPYTER_ENABLE_LAB=yes jupyter/datascience-notebook start-notebook.sh --NotebookApp.token=''
firefox 0.0.0.0:8888
单元格代码
%gui asyncio
import asyncio
def wait_for_change(widget, value):
future = asyncio.Future()
def getvalue(change):
# make the new value available
future.set_result(change.new)
widget.unobserve(getvalue, value)
widget.observe(getvalue, value)
return future
from ipywidgets import IntSlider
slider = IntSlider()
async def f():
for i in range(10):
print('did work %s'%i)
#x = await asyncio.sleep(1)
x = await wait_for_change(slider, 'value')
print('async function continued with value %s'%x)
asyncio.ensure_future(f())
#task = asyncio.create_task(f())
slider
预期结果
单元格输出
did work 0
async function continued with value 1
did work 1
async function continued with value 2
[...]
实际输出
第一个
did work 0
之后什么都没有笔记
import asyncio
async def main():
print('hello')
await asyncio.sleep(1)
print('world')
await main()
-e JUPYTER_ENABLE_LAB=yes
,然后你会得到一个没有 jupyter lab 的普通 jupyter notebook,预期的结果就会发生。 最佳答案
实际上它可以工作,但是 jupyter 会丢失打印输出。
试试这个代码:
from IPython.display import display
import ipywidgets as widgets
out = widgets.Output()
import asyncio
def wait_for_change(widget, value):
future = asyncio.Future()
def getvalue(change):
# make the new value available
future.set_result(change.new)
widget.unobserve(getvalue, value)
widget.observe(getvalue, value)
return future
from ipywidgets import IntSlider
slider = IntSlider()
# Now the key: the container is displayed (while empty) in the main thread
async def f():
for i in range(10):
out.append_stdout('did work %s'%i)
x = await wait_for_change(slider, 'value')
out.append_stdout('async function continued with value %s'%x)
asyncio.ensure_future(f())
display(slider)
display(out)
您可以在此处找到更多详细信息:https://github.com/jupyter-widgets/ipywidgets/issues/2567#issuecomment-535971252
关于jupyter-notebook - 如何在 jupyter lab 上使用异步小部件?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58996358/