Unable to block execution until Jupyter widget's value has been updated

[link89]

Given the following code:

from ipywidgets import IntsInput
from IPython.display import display

in_value = IntsInput(description="value")
before = in_value.value
print('before': before)
display(in_value)

while before == in_value.value:
    ...  # blocking until value is changed

print('after', in_value.value)

Obviously, the loop will blocking forever as in_value.value won't be evaluated again. Is there any way to make it work as simple as possible?

It looks like not possible as the observer is running on the main thread. Thus the following method also not work.

from ipywidgets import IntsInput
from IPython.display import display
from queue import Queue
import threading
import time

q = Queue()

widget = IntsInput()
display(widget)
def getvalue(change):
    q.put(change.new)
    widget.unobserve(getvalue, 'value')
widget.observe(getvalue, 'value')

print(q.get())

[RRosio]

Hi @link89 this looks like a question about ipywidgets. There is already an issue about blocking execution in that repository. Please add your thoughts there, thank you!