- Update to 4.0.0
+ Updated
* Updated Plotly.js to version 1.48.3.
+ Added
* The Plotly Express tech preview has been integrated as the `plotly.express` module
* Added a new renderers framework the supports rendering figure in a wide variety of contexts. See the new Displaying Plotly Figures documentation page for more information.
* Added `plotly.io.write_html` and `plotly.io.to_html` functions for exporting figures to HTML. Also available as `.write_html` and `.to_html` figure methods.
* Added new figure methods for batch updating figure properties (`update_layout`, `update_traces`, `update_xaxes`, etc.). See the new Creating and Updating Figures documentation page for more details.
* Added support for all trace types in `make_subplots`
* Added support for secondary y-axes in `make_subplots`
* Support passing a scalar trace object (rather than a list or tuple of trace objects) as the `data` property to the `Figure` constructor
* Added dictionary-stule `.pop` method to graph object classes
* New `jupyterlab-plotly` JupyterLab extension for rendering figures in JupyterLab. Replaces the `@jupyterlab/plotly-extension` extension, and includes JupyterLab 1.0 support.
* Added new suite of built-in colorscales to the `plotly.colors` module, and support for specifying this wide range of colorscales by name. Also added support for specifying colorscales as a list of colors, in which case the color spacing is assumed to be uniform.
* Added `sphinx-gallery` renderer for embedding plotly figures in Sphinx-Gallery.
+ Removed
* The follow modules for interfacing with the Chart Studio cloud service have been removed from plotly.py and moved to the new `chart-studio` distribution package. The following modules have been moved to a new top-level `chart_studio` module:
> `plotly.plotly` -> `chart_studio.plotly`
> `plotly.api` -> `chart_studio.api`
> `plotly.dashboard_objs` -> `chart_studio.dashboard_objs`
> `plotly.grid_objs` -> `chart_studio.grid_objs`
> `plotly.presentation_objs` -> `chart_studio.presentation_objs`
* The legacy `plotly.widgets.GraphWidget` class for displaying online figures hosted by Chart Studio as ipywidgets has been removed. Please use the offline, and much more capable, `plotly.graph_objects.FigureWidget` class instead.
* The `fileopt` argument to `chart_studio.plotly.plot` has been removed, so in-place modifications to previously published figures are no longer supported, and a figure will always overwrite a figure with the same name.
+ Changed
* The `'plotly'` template is used as the default theme across all figures.
* In order to reduce the size of the core `plotly` distribution package, the bundled geographic shape files used by the `create_choropleth` figure factory have been moved to a new optional `plotly-geo` distribution package
* For consistency with other figure factories, the `create_choropleth` and `create_gantt` figure factories now always returns `Figure` objects, rather than dictionaries.
* Figure add trace methods (`.add_trace`, `.add_traces`, `.add_scatter`, etc.) now return a reference to the calling figure, rather than the newly created trace
* `plotly.tools.make_subplots` has been moved to `plotly.subplots.make_subplots`, though it is still available at the previous location for backward compatibility
* The `plotly.graph_objs` module has been moved to `plotly.graph_objects`, though it is still available at the previous location for backward compatibility
* Trace `uid` properties are only generated automatically when a trace is added to a `FigureWidget`. When a trace is added to a standard `Figure` graph object the input `uid`, if provided, is accepted as is.
* `datetime` objects that include timezones are not longer converted to UTC
* When a tuple property (e.g. `layout.annotations`) is updated with a list/tuple that is longer than the current value, the extra elements are appended to the end of the tuple.
+ Fixed
* Fixed visibility of `bar` trace error bars in built-in templates