import plotly.graph_objects fails with ipywidget version is <= 7.0.0 #2264
Description
Steps to reproduce:
$ python3.7 -m venv test
$ . test/bin/activate
(test) $ pip install plotly
(test) $ pip install ipywidgets==6
(test) $ python -c "import plotly.graph_objects"
Traceback (most recent call last):
File "", line 1, in
File "/home/varoquau/tmp/clean_venv/test/lib/python3.7/site-packages/plotly/graph_objects.py", line 2, in
from plotly.graph_objs import *
AttributeError: module 'plotly.graph_objs' has no attribute 'FigureWidget'
The problem is on line 100184 of plotly/graph_objs/init.py: the __all__.append("FigureWidget") that is a few lines below should be moved under the "if" clause.
Given that it is generated code, I don't know how to fix it, so I won't send a pull request.