What's new in Matplotlib 3.4.0
* Figure and Axes creation / management
- New subfigure functionality
- Single-line string notation for subplot_mosaic
- Changes to behavior of Axes creation methods (gca, add_axes, add_subplot)
- add_subplot/add_axes gained an axes_class parameter
- Subplot and subplot2grid can now work with constrained layout
* Plotting methods
- axline supports transform parameter
- New automatic labeling for bar charts
- A list of hatches can be specified to bar and barh
- Setting BarContainer orientation
- Contour plots now default to using ScalarFormatter
- Axes.errorbar cycles non-color properties correctly
- errorbar errorevery parameter matches markevery
- hexbin supports data reference for C parameter
- Support callable for formatting of Sankey labels
- Axes.spines access shortcuts
- New stairs method and StepPatch artist
- Added orientation parameter for stem plots
- Angles on Bracket arrow styles
- TickedStroke patheffect
* Colors and colormaps
- Collection color specification and mapping
- Transparency (alpha) can be set as an array in collections
- pcolormesh has improved transparency handling by enabling snapping
- IPython representations for Colormap objects
- Colormap.set_extremes and Colormap.with_extremes
- Get under/over/bad colors of Colormap objects
- New cm.unregister_cmap function
- New CenteredNorm for symmetrical data around a center
- New FuncNorm for arbitrary normalizations
- GridSpec-based colorbars can now be positioned above or to the left of the main axes
* Titles, ticks, and labels
- supxlabel and supylabel
- Shared-axes subplots tick label visibility is now correct for top or left labels
- An iterable object with labels can be passed to Axes.plot
* Fonts and Text
- Text transform can rotate text direction
- matplotlib.mathtext now supports overset and underset LaTeX symbols
- math_fontfamily parameter to change Text font family
- TextArea/AnchoredText support horizontalalignment
- PDF supports URLs on Text artists
* rcParams improvements
- New rcParams for dates: set converter and whether to use interval_multiples
- Date formatters now respect usetex rcParam
- Setting image.cmap to a Colormap
- Tick and tick label colors can be set independently using rcParams
* 3D Axes improvements
- Errorbar method in 3D Axes
- Stem plots in 3D Axes
- 3D Collection properties are now modifiable
- Panning in 3D Axes
* Interactive tool improvements
- New RangeSlider widget
- Sliders can now snap to arbitrary values
- Pausing and Resuming Animations
* Sphinx extensions
- plot_directive caption option
* Backend-specific improvements
- Consecutive rasterized draws now merged
- Support raw/rgba frame format in FFMpegFileWriter
- nbAgg/WebAgg support middle-click and double-click
- nbAgg support binary communication
- Indexed color for PNG images in PDF files when possible
- Improved font subsettings in PDF/PS
- Kerning added to strings in PDFs
- Fully-fractional HiDPI in QtAgg
- wxAgg supports fullscreen toggle
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