Hvplot heatmap grouby opts change default tooltips

  1. I have a data frame in following format

  1. Now i want to change the tooltips in MBU_heat with following code

    from bokeh.models import HoverTool
    from holoviews import opts

hover=HoverTool(tooltips=[(‘Date’, ‘@{ddate}{%F}’),(‘MBU’,’@{MBU#}’),(‘Count’,’@{Count}’)], formatters={’@{ddate}’: ‘datetime’})

opts.defaults(opts.HeatMap(toolbar=‘above’, tools=[‘hover’]))

  1. Now i create a its heatmap with hvplot and groupby options with following code and output

MBU_heat=mbu_comp.hvplot.heatmap( title='MBU',x='ddate', y='MBU#', C='Count' ,reduce_function=np.sum ,groupby='RBU', widget_location='top_left',cmap=LSM_cmap,colorbar=True,height=400,width=700)

  1. Following are the status of MBU_heat

  1. tooltip does not apply on the heatmap .

  2. if I use via %opts or %% in notebook it works fine but i want to use in python program

  3. Kindly guide how i apply and access opts tools tip in MBU_heat objects in python program

  4. or how if can use %opts or %%opts in python program

I shall be very thankful

formating of the date not working in tooltip

Have you tried:

MBU_heat=mbu_comp.hvplot.heatmap( title='MBU',x='ddate', y='MBU#', C='Count' ,reduce_function=np.sum ,groupby='RBU', widget_location='top_left',cmap=LSM_cmap,colorbar=True,height=400,width=700).opts(tools=[hover])


Regarding the formatting. Sometimes hvplot screws up the variables, so maybe it got re-assigned to ‘x’:

For me, hvplot of an xarray object resulted in me having to use the following tooltip, since my dimension names got reassigned:

tooltips = [
            ('Date', '$x'),
            (f'Price ({quote_currency})', '$y{'+f'{formatting}0'+' a}'),
            (f'Volume ({quote_currency})', '@image{0,0.00}')
hover = HoverTool(tooltips=tooltips)


BTW, a useful way to find out your current plot’s hover variables is this:

renderer = hv.renderer('bokeh')

Deleting the quotes around hover in this line should do the trick:
opts.defaults(opts.HeatMap(toolbar=‘above’, tools=[‘hover’]))

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this works. Thanks a lot

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It results to following error

AttributeError: ‘Column’ object has no attribute ‘opts’


[0] Row
[0] WidgetBox
[0] Select(margin=(20, 20, 20, 20), name=‘RBU’, options=[‘Central A’, …], value=‘Central A’, width=250)
[1] HSpacer()
[1] HoloViews(DynamicMap, widget_location=‘top_left’)