[FIXED] Jupyter, AttributeError: type object 'Widget' has no attribute 'observe'

Issue

I tried to use observe for my toggleButton

wtarget = widgets.ToggleButtons(
    description='select target',
    options=['A', 'B', 'C', 'D', 'E', 'F'])
wtarget.observe(target_on_value_change, names='value')  

It displayed this error:

AttributeError: 'ToggleButtons' object has no attribute 'observe'

I had no problem with another MacBook but this one showed the problem. I am using MacBook, 10.12. Python Version 4.0.0. ipywidgets was installed via pip.

Thanks.

Solution

This suggests that you have an old version of traitlets. .observe was added in traitlets 4.1:

pip install --upgrade traitlets

You may want to upgrade more than that:

pip install --upgrade ipywidgets

Answered By - minrk