type annotations for chainable Figure methods

[nicolaskruchten]

No description provided.

[nicolaskruchten]

This PR lets you do things like px.scatter(...).<tab> and your IDE (VSCode, Jupyter, others) will be able to suggest all the go.Figure methods to you like update_layout(). Furthermore, those methods have type hints now too so you can do px.scatter(...).update_layout(...).<tab> and get suggestions.

For folks not into long chains, the following is nice too: fig = px.scatter(...); fig.<tab> and you get suggestions.

(N.B. the autocomplete key isn't always <tab> but hopefully my meaning is clear :)