You are reading documentation for the unreleased version of Matplotlib. Try searching for the released version of this page instead?
Version 3.1.0.post919+g4ce649c38
matplotlib
Fork me on GitHub

matplotlib.axes.Axes.set_autoscaley_on

Axes.set_autoscaley_on(self, b)

Set whether autoscaling for the y-axis is applied on plot commands

Parameters:
b : bool