add data labels to dodge(grouped) bar plots

Question

I am new to Bokeh and Python. I finally created a grouped bar chart,but not able to add data label to the corresponding bar. As shown in the screenshot below, all 3 data labels are stacked onto one bar.

Can you please help me to add data label to each of the bars? Thank you.

from bokeh.core.properties import value
from bokeh.io import show, output_file
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.transform import dodge

output_file("dodged_bars.html")

fruits = ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries']
years = ['2015', '2016', '2017']

data = {'fruits' : fruits,
        '2015'   : [2, 1, 4, 3, 2, 4],
        '2016'   : [5, 3, 3, 2, 4, 6],
        '2017'   : [3, 2, 4, 4, 5, 3]}

source = ColumnDataSource(data=data)

p = figure(x_range=fruits, y_range=(0, 10), plot_height=250, title="Fruit Counts by Year",
           toolbar_location=None, tools="")

labels15=LabelSet(x='fruits',y='2015',text='2015',source=source)
labels16=LabelSet(x='fruits',y='2016',text='2016',source=source)
labels17=LabelSet(x='fruits',y='2017',text='2017',source=source)

p.vbar(x=dodge('fruits', -0.25, range=p.x_range), top='2015', width=0.2, source=source,
       color="#c9d9d3", legend=value("2015"))

p.vbar(x=dodge('fruits',  0.0,  range=p.x_range), top='2016', width=0.2, source=source,
       color="#718dbf", legend=value("2016"))

p.vbar(x=dodge('fruits',  0.25, range=p.x_range), top='2017', width=0.2, source=source,
       color="#e84d60", legend=value("2017"))

p.x_range.range_padding = 0.1
p.xgrid.grid_line_color = None
p.legend.location = "top_left"
p.legend.orientation = "horizontal"

p.add_layout(labels15)
p.add_layout(labels16)
p.add_layout(labels17)



show(p)

Answer 1

You can use the same method as you used for the vbars.

from bokeh.core.properties import value
from bokeh.io import show, output_file
from bokeh.models import ColumnDataSource, LabelSet
from bokeh.plotting import figure
from bokeh.transform import dodge

output_file("dodged_bars.html")

fruits = ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries']
years = ['2015', '2016', '2017']
data = {'fruits' : fruits,
        '2015'   : [2, 1, 4, 3, 2, 4],
        '2016'   : [5, 3, 3, 2, 4, 6],
        '2017'   : [3, 2, 4, 4, 5, 3]}

source = ColumnDataSource(data=data)

p = figure(x_range=fruits, y_range=(0, 10), plot_height=250, title="Fruit Counts by Year",
           toolbar_location=None, tools="")

labels15=LabelSet(x=dodge('fruits', -0.25, range=p.x_range),y='2015',text='2015',source=source,text_align='center')
labels16=LabelSet(x=dodge('fruits', 0.0, range=p.x_range),y='2016',text='2016',source=source,text_align='center')
labels17=LabelSet(x=dodge('fruits', 0.25, range=p.x_range),y='2017',text='2017',source=source,text_align='center')

vbar1 = p.vbar(x=dodge('fruits', -0.25, range=p.x_range), top='2015', width=0.2, source=source,
       color="#c9d9d3", legend=value("2015"))

p.vbar(x=dodge('fruits',  0.0,  range=p.x_range), top='2016', width=0.2, source=source,
       color="#718dbf", legend=value("2016"))

p.vbar(x=dodge('fruits',  0.25, range=p.x_range), top='2017', width=0.2, source=source,
       color="#e84d60", legend=value("2017"))

p.x_range.range_padding = 0.1
p.xgrid.grid_line_color = None
p.legend.location = "top_left"
p.legend.orientation = "horizontal"

p.add_layout(labels15)
p.add_layout(labels16)
p.add_layout(labels17)

show(p)