matplotlib/matplotlib: REL: v3.4.0

Highlights of this release include: 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