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Update sankey-diagram.md #2291

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Mar 27, 2020
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Update sankey-diagram.md #2291

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Update sankey-diagram.md
SylwiaOliwia2 Mar 19, 2020
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SylwiaOliwia2 Mar 27, 2020
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Change paragraph title to 'More complex Sankey diagram with colored l…
SylwiaOliwia2 Mar 27, 2020
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17 changes: 13 additions & 4 deletions doc/python/sankey-diagram.md
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Expand Up @@ -62,15 +62,23 @@ fig.update_layout(title_text="Basic Sankey Diagram", font_size=10)
fig.show()
```

### More complex Sankey diagram
### More complex Sankey diagram with colored links

```python inputHidden=false outputHidden=false
```python
import plotly.graph_objects as go
import urllib, json

url = 'https://raw.githubusercontent.com/plotly/plotly.js/master/test/image/mocks/sankey_energy.json'
response = urllib.request.urlopen(url)
data = json.loads(response.read())

# override gray link colors with 'source' colors
opacity = 0.4
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# change 'magenta' to its 'rgba' value to add opacity
data['data'][0]['node']['color'] = ['rgba(255,0,255, 0.8)' if color == "magenta" else color for color in data['data'][0]['node']['color']]
data['data'][0]['link']['color'] = [data['data'][0]['node']['color'][src].replace("0.8", str(opacity))
for src in data['data'][0]['link']['source']]

fig = go.Figure(data=[go.Sankey(
valueformat = ".0f",
valuesuffix = "TWh",
Expand All @@ -87,8 +95,9 @@ fig = go.Figure(data=[go.Sankey(
source = data['data'][0]['link']['source'],
target = data['data'][0]['link']['target'],
value = data['data'][0]['link']['value'],
label = data['data'][0]['link']['label']
))])
label = data['data'][0]['link']['label'],
color = data['data'][0]['link']['color']
))])

fig.update_layout(title_text="Energy forecast for 2050<br>Source: Department of Energy & Climate Change, Tom Counsell via <a href='https://bost.ocks.org/mike/sankey/'>Mike Bostock</a>",
font_size=10)
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