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elements.py — Bokeh 2.4.3 Documentation
elements.py
A scatter plot using data from the Periodic Table . This example
demonstrates using basic hover tooltips and adding labels for individual
points.
Details
Sampledata
bokeh.sampledata.periodic_table
Bokeh APIs
Figure.scatter
, bokeh.models.ColumnDataSource
, bokeh.models.LabelSet
More info
Configuring plot tools > HoverTool
Keywords
hover, labels, scatter
import pandas as pd
from bokeh.models import ColumnDataSource , LabelSet
from bokeh.plotting import figure , show
from bokeh.sampledata.periodic_table import elements
elements = elements . copy ()
elements = elements [ elements [ "atomic number" ] <= 82 ]
elements = elements [ ~ pd . isnull ( elements [ "melting point" ])]
mass = [ float ( x . strip ( "[]" )) for x in elements [ "atomic mass" ]]
elements [ "atomic mass" ] = mass
palette = [ "#053061" , "#2166ac" , "#4393c3" , "#92c5de" , "#d1e5f0" ,
"#f7f7f7" , "#fddbc7" , "#f4a582" , "#d6604d" , "#b2182b" , "#67001f" ]
melting_points = elements [ "melting point" ]
low = min ( melting_points )
high = max ( melting_points )
melting_point_inds = [ int ( 10 * ( x - low ) / ( high - low )) for x in melting_points ] #gives items in colors a value from 0-10
elements [ 'melting_colors' ] = [ palette [ i ] for i in melting_point_inds ]
TITLE = "Density vs Atomic Weight of Elements (colored by melting point)"
TOOLS = "hover,pan,wheel_zoom,box_zoom,reset,save"
p = figure ( tools = TOOLS , toolbar_location = "above" , width = 1200 , title = TITLE )
p . toolbar . logo = "grey"
p . background_fill_color = "#efefef"
p . xaxis . axis_label = "atomic weight (amu)"
p . yaxis . axis_label = "density (g/cm^3)"
p . grid . grid_line_color = "white"
p . hover . tooltips = [
( "name" , "@name" ),
( "symbol:" , "@symbol" ),
( "density" , "@density" ),
( "atomic weight" , "@{atomic mass}" ),
( "melting point" , "@{melting point}" )
]
source = ColumnDataSource ( elements )
p . scatter ( "atomic mass" , "density" , size = 12 , source = source ,
color = 'melting_colors' , line_color = "black" , alpha = 0.9 )
labels = LabelSet ( x = "atomic mass" , y = "density" , text = "symbol" , y_offset = 8 ,
text_font_size = "11px" , text_color = "#555555" ,
source = source , text_align = 'center' )
p . add_layout ( labels )
show ( p )
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