I’m stuck around this for hours with no success, since the documentation is very cumbersome and time-consuming. I need a simple basic Hello World example to extract a simple text from a text box

from ipywidgets import interact, widgets
from IPython.display import display

dossier_number_widget = widgets.Text(
    value='EP23210283',
    placeholder='EP23210283',
    description='Dossier Number:',
    disabled=False,
    continuous_update=True
)
display(dossier_number_widget)

def callback(wdgt):
    print(wdgt)
    display(wdgt)

dossier_number_widget.observe(callback, 'value')

It’s not working, what am I doing wrong?

Other examples here on SO mention on_submit but this method is deprecated