1API Changes for 3.0.1 2===================== 3 4`.tight_layout.auto_adjust_subplotpars` can return ``None`` now if the new 5subplotparams will collapse axes to zero width or height. This prevents 6``tight_layout`` from being executed. Similarly 7`.tight_layout.get_tight_layout_figure` will return None. 8 9To improve import (startup) time, private modules are now imported lazily. 10These modules are no longer available at these locations: 11 12- ``matplotlib.backends.backend_agg._png`` 13- ``matplotlib.contour._contour`` 14- ``matplotlib.image._png`` 15- ``matplotlib.mathtext._png`` 16- ``matplotlib.testing.compare._png`` 17- ``matplotlib.texmanager._png`` 18- ``matplotlib.tri.triangulation._tri`` 19- ``matplotlib.tri.triangulation._qhull`` 20- ``matplotlib.tri.tricontour._tri`` 21- ``matplotlib.tri.trifinder._tri`` 22