Data tooltips in Bokeh don’t show data, showing ‘???’ instead

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I was having the same problem. I found this reference useful. The tooltip for Sales would use the generic @height, e.g.:
hover.tooltips = [('Sales', '@height')]

Similarly, replacing @height with @y would give you the total sales for each year. I haven’t figured out how to use the tooltip to access the stacked categories or how to use the ColumnDataSource referred to in the link.

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