import pandas as pd
import holoviews as hv
from holoviews import opts, dim

# example from https://bokeh.pydata.org/en/latest/docs/gallery.html#

data={'nodes':[{'name': 'Fred',         'group': 1},
               {'name': 'Wilma',         'group': 1},
               {'name': 'Pebbles',      'group': 1},
               {'name': 'Barney',      'group': 1}, #3
               {'name': 'Belly',      'group': 1},
               {'name': 'BamBam',     'group': 2},
               {'name': 'GadZ00',     'group': 3},
               {'name': 'MrSlate',     'group': 4}, #7
               {'name': 'MrStone',     'group': 4}
               ],
    'links': [{'source': 1, 'target': 0, 'value': 5},
              {'source': 2, 'target': 0, 'value': 5},
              {'source': 3, 'target': 0, 'value': 1},
              {'source': 4, 'target': 3, 'value': 5},
              {'source': 2, 'target': 1, 'value': 1},
              {'source': 7, 'target': 0, 'value': 5},
              {'source': 5, 'target': 0, 'value': 5},
              {'source': 6, 'target': 1, 'value': 5},
            #-error if included -> {'source': 5, 'target': 2, 'value': 5},
              {'source': 3, 'target': 2, 'value': 5}
              ] }

hv.extension('bokeh')
hv.output(size=200)

links = pd.DataFrame(data['links'])
nodes = hv.Dataset(pd.DataFrame(data['nodes']), 'index')
chord = hv.Chord((links, nodes)).select(value=(4, None))
ob = chord.opts(
    opts.Chord(cmap='Category20', edge_cmap='Category20', edge_color=dim('source').str(),
               labels='name', node_color=dim('index').str()))
hv.save(ob, 'out2.html')