matplotlib.artist.Artist.format_cursor_data
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Artist.format_cursor_data(self, data)[source]
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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/3.3.3/api/_as_gen/matplotlib.artist.Artist.format_cursor_data.html