You are reading documentation for the unreleased version of Matplotlib. Try searching for the released version of this page instead?
Applications are open for the 2018 John Hunter Matplotlib Summer Fellowship. Apply now!
Version 2.2.2.post1762+g66a6d70bd
matplotlib
Fork me on GitHub

matplotlib.axes.Axes.has_data

Axes.has_data()

Return True if any artists have been added to axes.

This should not be used to determine whether the dataLim need to be updated, and may not actually be useful for anything.