Inconsequential error? "set changed size during iteration"

On May 9, 2019, at 8:22 AM, Sébastien Roche <sebastienroche11@gmail.com> wrote:

With the code below i get a RuntimeError('Set changed size during iteration',) message when clicking on the buttons, but the callback is doing exactly what it;s meant to do (adds buttons) and the added buttons work well too. It seems the set changed size error has no effect at all, or does it? Not sure if I should be concerned by it

I use python 3.7 and bokeh 1.1.0

from bokeh.io import curdoc
from bokeh.models import Button
from bokeh.layouts import widgetbox

def add_button():
    box = curdoc().select_one({"name":"test"})
    n = len(box.children)
    button = Button(label='test{}'.format(n))
    button.on_click(add_button)
    box.children += [button]

button = Button(label='test')
button.on_click(add_button)

box = widgetbox([button],name='test')

curdoc().add_root(box)

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