Axes.yaxis_inverted(self) Return whether the y-axis is inverted.
The axis is inverted if the bottom value is larger than the top value.
See also
invert_yaxis
get_ylim, set_ylim
get_ybound, set_ybound
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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.axes.Axes.yaxis_inverted.html