🥧 Day 25: Pie Chart in Python

 

🥧 Day 25: Pie Chart in Python

🔹 What is a Pie Chart?

A Pie Chart is a circular visualization that shows how different categories contribute to a whole (100%).

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🔹 When Should You Use It?

Use a pie chart when:

• You want to show percentage distribution

• Categories are limited

• Highlighting dominant portions

Avoid it when precise comparison is needed.

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🔹 Example Scenario

You want to visualize:

• Market share of products

• Budget allocation

• Time spent on activities

A pie chart instantly shows which category has the largest share.

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🔹 Key Idea Behind It

👉 Entire circle represents 100%
👉 Each slice shows relative contribution
👉 Focus is on visual comparison, not exact values

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🔹 Python Code (Pie Chart)

import matplotlib.pyplot as plt

labels = ['Product A', 'Product B', 'Product C', 'Product D']
sizes = [40, 25, 20, 15]

plt.pie(
 sizes, 
labels=labels, 
autopct='%1.1f%%',
 startangle=90 )

plt.title('Market Share Distribution') 
plt.axis('equal')
 plt.show()

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🔹 Output Explanation

• Larger slices represent higher percentages

• Percent values are displayed on the chart

• Equal axis ensures a perfect circle

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🔹 Pie Chart vs Bar Chart

Aspect	Pie Chart	Bar Chart
Purpose	Show proportions	Compare values
Accuracy	Low	High
Data size	Small	Any
Trend	❌	✅

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🔹 Key Takeaways

• Best for simple percentage breakdowns

• Avoid too many categories

• Not suitable for precise comparisons

• Use labels and percentages clearly