🚀 Day 7/150 – Swap Two Variables in Python

 

Today we will learn how to swap two variables in Python using different methods.

Swapping is a very common concept used in:

• Sorting algorithms
• Data manipulation
• Problem solving

🧠 Problem Statement

👉 Write a Python program to swap two variables.

1️⃣ Method 1 – Using a Temporary Variable

This is the most traditional method.

a = 5 b = 10 temp = a a = b b = temp print("a =", a) print("b =", b)

✔ Easy to understand

✔ Good for beginners

2️⃣ Method 2 – Pythonic Way (Tuple Swapping)

Python provides a simple and elegant way to swap variables.

a = 5 b = 10 a, b = b, a print("a =", a) print("b =", b)

✔ Short and clean
✔ Most recommended method

3️⃣ Method 3 – Using Addition and Subtraction

Swap values without using a third variable.

a = 5 b = 10 a = a + b b = a - b a = a - b print("a =", a) print("b =", b)

✔ No extra variable needed

⚠️ Can cause overflow with very large numbers

4️⃣ Method 4 – Using Multiplication and Division

Another method without a temporary variable.

a = 5
b = 10

a = a * b
b = a / b
a = a / b

print("a =", a)
print("b =", b)

✔ Works without extra variable
⚠️ Avoid if values can be zero (division issue)

⚠️ Important Note

• Avoid division method when b = 0
• Prefer tuple swapping for clean and safe code

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🎯 Key Takeaways

Today you learned:

• Multiple ways to swap variables
• Python’s tuple unpacking
• Logic behind swapping without extra variables