/Python/Ipywidgets unobserve functools partial

Ipywidgets unobserve functools partial

import ipywidgets as widgets
w = widgets.Text()
w.unobserve(None,...)
            
# still need to pass `names` whenever needed. 
# But at least you don't need to know the exact name of the handler. 
# Specially if you have used a `partial` when setting the observer.

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