🔀 Day 35: Sankey Diagram in Python

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🔹 What is a Sankey Diagram?

A Sankey Diagram visualizes the flow of quantities from one set of categories to another.

• Width of the flow = magnitude

• Nodes = categories

• Links = movement between categories

It clearly shows how data moves.

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🔹 When Should You Use It?

Use a Sankey diagram when:

• Showing energy flow

• Visualizing budget allocation

• Tracking user journey

• Displaying process transitions

• Showing source → target relationships

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🔹 Example Scenario

Creative workflow:

• Inspiration

• Moodboard

• Sketch

• Final Edit

• Pinterest

• Instagram

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🔹 Key Idea Behind It

👉 Nodes represent entities
👉 Links represent flow
👉 Link width shows volume
👉 Best for process visualization

🔹 Python Code (Sankey Diagram)

import plotly.graph_objects as go

label = ["Inspiration", "Moodboard", "Sketch", "Final Edit", "Pinterest", "Instagram"] 
source = [0, 0, 1, 1, 2, 3, 3] 
target = [1, 2, 2, 3, 3, 4, 5] 
value = [40, 20, 30, 25, 45, 30, 25] 

node_colors = ["#E6E2D3", "#DBC1AD", "#A69080", "#C9ADA7", "#9A8C98", "#F2E9E4"]
link_colors = "rgba(201, 173, 167, 0.3)" 

fig = go.Figure(data=[go.Sankey(
 node = dict(
 pad = 30, 
 thickness = 12, 
line = dict(color = "white", width = 1), 
label = label, color = node_colors ),
      link = dict(
      source = source,
      target = target,
      value = value,
      color = link_colors 
))])
fig.update_layout( 
font_size=14, 
font_family="serif",
paper_bgcolor="#FAF9F6", 
plot_bgcolor="#FAF9F6",
width=1000, height=600, 
margin=dict(l=50, r=50, t=50, b=50) )
 fig.show()
#source code-->clcoding.com

🔹 Updated Output Explanation
The workflow begins at Inspiration, which splits into Moodboard and Sketch.
From Moodboard, ideas flow further into Sketch and Final Edit.
Sketch contributes heavily toward Final Edit (largest flow = 45).
Final Edit distributes content to Pinterest and Instagram.
The thickness of each connection represents how much effort or volume moves through that path.

Visually, you can clearly see:
👉 Where most creative energy is concentrated

👉 Which stage receives the highest input

👉 How the final output spreads across platforms