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Re:Introducing plotly.py 3.0.0 by jmmease on Thursday July 05, 2018 @06:56PM (#17467568)
Do you have ipywidgets >= 7.2 installed (See install instruction at https://github.com/plotly/plotly.py)?

ipywidgets is an optional dependency and FigureWidget won't be available without it.

Re:Introducing plotly.py 3.0.0 by kmonad on Thursday July 05, 2018 @10:45PM (#17468501)
Thanks - that solved it! Works great now.