Parameters to ``plt.figure()`` and the ``Figure`` constructor

All parameters to `.pyplot.figure` and the `.Figure` constructor, other than

*num*, *figsize*, and *dpi*, are now keyword-only.

``stem(..., use_line_collection=False)``

... is no longer supported. This was a compatibility fallback to a

former more inefficient representation of the stem lines.

Positional / keyword arguments

Passing all but the very few first arguments positionally in the constructors

of Artists is no longer possible. Most arguments are now keyword-only.

The *emit* and *auto* parameters of ``set_xlim``, ``set_ylim``,

``set_zlim``, ``set_rlim`` are now keyword-only.

The *transOffset* parameter of `.Collection.set_offset_transform` and the

various ``create_collection`` methods of legend handlers has been renamed to

*offset_transform* (consistently with the property name).

``Axes.get_window_extent`` / ``Figure.get_window_extent`` accept only

*renderer*. This aligns the API with the general `.Artist.get_window_extent`

API. All other parameters were ignored anyway.

Methods to set parameters in ``LogLocator`` and ``LogFormatter*``

In `~.LogFormatter` and derived subclasses, the methods ``base`` and

``label_minor`` for setting the respective parameter are removed and

replaced by ``set_base`` and ``set_label_minor``, respectively.

In `~.LogLocator`, the methods ``base`` and ``subs`` for setting the respective

parameter are removed. Instead, use ``set_params(base=..., subs=...)``.

``Axes.get_renderer_cache``

The canvas now takes care of the renderer and whether to cache it or not,

so the ````Axes.get_renderer_cache`` method is removed. The

alternative is to call ``axes.figure.canvas.get_renderer()``.

Unused methods in ``Axis``, ``Tick``, ``XAxis``, and ``YAxis``

``Tick.label`` is now removed. Use ``Tick.label1`` instead.

The following methods are no longer used and removed without a replacement:

- ``Axis.get_ticklabel_extents``

- ``Tick.get_pad_pixels``

- ``XAxis.get_text_heights``

- ``YAxis.get_text_widths``

``mlab.stride_windows``

... is removed. Use ``numpy.lib.stride_tricks.sliding_window_view`` instead.

``Axes3D``

The ``dist`` attribute has been privatized. Use the *zoom* keyword argument in

`.Axes3D.set_box_aspect` instead.

The ``w_xaxis``, ``w_yaxis``, and ``w_zaxis`` attributes are now removed.

Instead use ``xaxis``, ``yaxis``, and ``zaxis``.

3D Axis

``mplot3d.axis3d.Axis.set_pane_pos`` is removed. This is an internal method

where the provided values are overwritten during drawing. Hence, it does not

serve any purpose to be directly accessible.

The two helper functions ``mplot3d.axis3d.move_from_center`` and

``mplot3d.axis3d.tick_update_position`` are considered internal and deprecated.

If these are required, please vendor the code from the corresponding private

methods ``_move_from_center`` and ``_tick_update_position``.

``checkdep_usetex`` removed

This method was only intended to disable tests in case no latex install was

found. As such, it is considered to be private and for internal use only.

Please vendor the code from a previous version if you need this.

``date_ticker_factory`` removed

The ``date_ticker_factory`` method in the `matplotlib.dates` module is

removed. Instead use `~.AutoDateLocator` and `~.AutoDateFormatter` for a

more flexible and scalable locator and formatter.

If you need the exact ``date_ticker_factory`` behavior, please copy the code

from a previous version.

``transforms.Affine2D.identity()``

... is removed in favor of directly calling the `.Affine2D` constructor with

no arguments.

Removals in ``testing.decorators``

The unused class ``CleanupTestCase`` and decorator ``cleanup`` are removed.

The function ``check_freetype_version`` is considered internal and removed.

Vendor the code from a previous version.

``text.get_rotation()``

... is removed with no replacement. Copy the previous implementation if

needed.

Miscellaneous internals

- ``axes_grid1.axes_size.AddList``; use ``sum(sizes, start=Fixed(0))`` (for

example) to sum multiple size objects.

- ``axes_size.Padded``; use ``size + pad`` instead

- ``axes_size.SizeFromFunc``, ``axes_size.GetExtentHelper``

- ``AxisArtistHelper.delta1`` and ``AxisArtistHelper.delta2``

- ``axislines.GridHelperBase.new_gridlines`` and

``axislines.Axes.new_gridlines``

- ``_DummyAxis.dataLim`` and ``_DummyAxis.viewLim``; use

``get_data_interval()``, ``set_data_interval()``, ``get_view_interval()``,

and ``set_view_interval()`` instead.

- ``ImageMagickBase.delay`` and ``ImageMagickBase.output_args``

- ``MathtextBackend``, ``MathtextBackendAgg``, ``MathtextBackendPath``,

``MathTextWarning``

- ``TexManager.get_font_config``; it previously returned an internal hashed key

for used for caching purposes.

- ``TextToPath.get_texmanager``; directly construct a `.texmanager.TexManager`

instead.

- ``ticker.is_close_to_int``; use ``math.isclose(x, round(x))`` instead.

- ``ticker.is_decade``; use ``y = numpy.log(x)/numpy.log(base);

numpy.isclose(y, numpy.round(y))`` instead.

Backend-specific removals

- ``backend_pdf.Name.hexify``

- ``backend_pdf.Operator`` and ``backend_pdf.Op.op`` are removed in favor of

a single standard `enum.Enum` interface on `.backend_pdf.Op`.

- ``backend_pdf.fill``; vendor the code of the similarly named private

functions if you rely on these functions.

- ``backend_pgf.LatexManager.texcommand`` and

``backend_pgf.LatexManager.latex_header``

- ``backend_pgf.NO_ESCAPE``

- ``backend_pgf.common_texification``

- ``backend_pgf.get_fontspec``

- ``backend_pgf.get_preamble``

- ``backend_pgf.re_mathsep``

- ``backend_pgf.writeln``

- ``backend_ps.convert_psfrags``

- ``backend_ps.quote_ps_string``; vendor the code of the similarly named

private functions if you rely on it.

- ``backend_svg.escape_attrib``; vendor the code of the similarly named private

functions if you rely on it.

- ``backend_svg.escape_cdata``; vendor the code of the similarly named private

functions if you rely on it.

- ``backend_svg.escape_comment``; vendor the code of the similarly named

private functions if you rely on it.

- ``backend_svg.short_float_fmt``; vendor the code of the similarly named

private functions if you rely on it.

- ``backend_svg.generate_transform`` and ``backend_svg.generate_css``