You are reading an old version of the documentation (v2.0.0). For the latest version see https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.get_data_ratio.html
matplotlib

Travis-CI:

This Page

matplotlib.axes.Axes.get_data_ratio

Axes.get_data_ratio()

Returns the aspect ratio of the raw data.

This method is intended to be overridden by new projection types.