Axes.format_cursor_data(self, data)
Return a string representation of data.
Note
This method is intended to be overridden by artist subclasses. As an end-user of Matplotlib you will most likely not call this method yourself.
The default implementation converts ints and floats and arrays of ints and floats into a comma-separated string enclosed in square brackets.
See also
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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.axes.Axes.format_cursor_data.html