Looking

> import plotly

data = dict(
    type='sankey',
    node = dict(
      pad = 15,
      thickness = 20,
      line = dict(
        color = "black",
        width = 0.5
      ),
      label = ['<a href="https://plot.ly/python/sankey-diagram/">A1</a>', 
                '<a href="https://plot.ly/python/sankey-diagram/">A2</a>', 
                '<a href="https://plot.ly/python/sankey-diagram/">B1</a>', 
                '<a href="https://plot.ly/python/sankey-diagram/">B2</a>', 
                '<a href="https://plot.ly/python/sankey-diagram/">C1</a>', 
                '<a href="https://plot.ly/python/sankey-diagram/">C2</a>'],
      color = ["blue", "blue", "blue", "blue", "blue", "blue"]
    ),
    link = dict(
      source = [0,1,0,2,3,3],
      target = [2,3,3,4,4,5],
      value = [8,4,2,8,4,2]
  ))

layout =  dict(
    title = "Basic Sankey Diagram",
    font = dict(
      size = 10
    )
)

fig = dict(data=[data], layout=layout)
plotly.offline.plot(fig, filename = 'issue.html', auto_open=True)<