Unobserve doesn't work

[gioxc88]

import ipywidgets as w

def test(change):
    print(3)

b = w.Button()
b.on_click(test)

b.unobserve(test)  # does not work
b.unibserve_all()  # does not work

[vidartf]

on_click does not use observe, so consequently, unobserve will not do anything in your example. Try setting on_click = None.

[jasongrout]

Please don't set on_click = None. Instead, call the function with the remove=True argument (see docs at https://ipywidgets.readthedocs.io/en/stable/examples/Widget%20Events.html?highlight=on_click#Special-events).

b.on_click(test, remove=True)