Adapt to Plotly 3.0

Plotly 3.0 is about to be released and it has a ton of interesting things! 🎉 https://medium.com/@plotlygraphs/introducing-plotly-py-3-0-0-7bb1333f69c6

(for the moment, as explained in the installation instructions, only a release candidate is available)

In particular:

• Just like every other object in Jupyter. plotly.offline.init_notebook_mode and plotly.offline.iplot are no longer necessary.

  • In fact, I just tried and it just works!
• A new FigureWidget class has been introduced, which allows for interactivity, animations…
  • Anyhow we should focus on the Figure class (we’re implicitly using it in the form of a dictionary) because it’s easier to share and persist in the notebook.
  • We should probably make the OrbitPlotter classes more flexible and don’t hardcode a particular type of object, thus allowing the user to create a Figure or a FigureWidget
• New imperative functions, more similar to how matplotlib works
  • These might make figure updates easier
• Static image export
  • This will require installing node anyway, so for easy, publication-quality static plots we should still offer a matplotlib backend, see #338

There’s a work in progress migration guide:

https://github.com/plotly/plotly.py/blob/ipyplotly_integration/migration-guide.md

This release is going to be huge, so I propose we just add plotly>=3.0.0 when it’s on PyPI and start working from there.

[astrojuanlu]

Never mind, I think I was having some temporary connectivity issues. Everything is working well 👍

[astrojuanlu]

In Jupyter Lab it doesn’t:

On the other hand, I’ve been playing with Figure and FigureWidget like this:

diff --git a/src/poliastro/plotting.py b/src/poliastro/plotting.py
index ff25fea..2188146 100644
--- a/src/poliastro/plotting.py
+++ b/src/poliastro/plotting.py
@@ -244,7 +244,8 @@ class _BaseOrbitPlotter:
 
     @property
     def figure(self):
-        return dict(
+        from plotly.graph_objs import Figure, FigureWidget
+        return Figure(
             data=self._data + [self._attractor_data],
             layout=self._layout,
         )

And I suspect that Figure is now broken in the classic notebook, and that it only works in Jupyter Lab. Investigating.