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.
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
This error can also arise if you inherit from a widget but forget to call super. That is
from ipywidgets import VBox, Text
class MyToggle(VBox):
def __init__(self):
self.children = [Text(description="hello")]
my_toggle = MyToggle()
my_toggle
returns
# ...
# AttributeError: 'MyToggle' object has no attribute '_model_id'
The solution is to call super in __init__:
class MyToggle(VBox):
def __init__(self):
super(MyToggle, self).__init__()
self.children = [Text(description="hello")]
