如何在plotly (python) sankey中显示图例？

Question

我想绘制一些代表不同物质质量流量的桑基图以供报告。我想用图例来区分这些物质，但我不知道该怎么做。我尝试过showlegend但没有成功

import plotly.graph_objects as go

fig = go.Figure(data=[go.Sankey(
    node = dict(
      pad = 15,
      thickness = 20,
      line = dict(color = "black", width = 0.5),
      label = ['household','industry','waste'],
      color = "blue"
    ),
    link = dict(
      source = [0,1,0,1], # indices correspond to labels, eg A1, A2, A2, B1, ...
      target = [2,2,2,2],
      value = [7190,2074,4483,74.50],
      label = ['aluminium','aluminium','copper','copper'],
      color = ['#d7d6d6','#d7d6d6','#f3cf07','#f3cf07']
  ))])
fig.update_layout(showlegend=True)
fig.show() 

Answer 1

看来 Plotly Sankey 跟踪实际上并不支持图例，尽管目前的文档似乎表明它们确实支持。

我已经在 Plotly 存储库上创建了相应的问题；看起来该决议可能正在改进文档以使这一点更加清晰。