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How to Swap Two Numbers in Python? (Program Examples to Swap Variables)

Swapping variables is a fundamental operation in programming that allows us to rearrange and manipulate data effortlessly. Whether you're a beginner programmer or an experienced developer, mastering the art of swapping of two numbers in Python is an essential skill that will enhance your problem-solving capabilities and streamline your coding endeavors.

Here, we will dive into variable swapping and explore different techniques to swap two numbers in Python. 

By understanding and applying these programs, you'll gain a powerful tool in your programming arsenal. Swapping variables can be used in various scenarios, such as sorting algorithms, data manipulation, efficient memory management, and even in solving complex mathematical problems. It enables you to efficiently reassign values, update states, and simplify the logic of your programs.

Whether you're a student embarking on your coding journey, a seasoned developer seeking elegant solutions, or an enthusiast eager to expand your knowledge, this tutorial is designed to equip you with practical techniques to effortlessly write a program to swap two numbers in Python.

Program to Swap Two Numbers in Python

Code

# Swap values of two numbers

# Input the numbers from the user
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))

# Swap the numbers using a temporary variable
temp = num1
num1 = num2
num2 = temp

# Print the swapped numbers
print("After swapping:")
print("First number:", num1)
print("Second number:", num2)

Output

Enter the first number: 5
Enter the second number: 3
After swapping:
First number: 3.0
Second number: 5.0

Explanation

  • We first take input from the user for the two numbers.

  • Next, we swap the values of the numbers using a temporary variable. The temporary variable (temp) stores the value of the first number (num1), then we assign the value of the second number (num2) to num1, and finally, assign the value of temp (which holds the original value of num1) to num2.

  • Finally, we print the swapped numbers.

Python Course

Swap Two Numbers Without Using Third Variable in Python

Code

# Swap without using 3rd variable

# Input the numbers from the user
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))

# Swap the numbers without using a third variable
num1, num2 = num2, num1

# Print the swapped numbers
print("After swapping:")
print("First number:", num1)
print("Second number:", num2)

Output

Enter the first number: 6
Enter the second number: 9
After swapping:
First number: 9.0
Second number: 6.0

Explanation

  • We take input from the user for the two numbers.

  • Next, we swap the values of the numbers using a technique called multiple assignment. By assigning the values num2, num1 to num1, num2 respectively, the values of the variables are interchanged without the need for a third variable.

  • Finally, we print the swapped numbers.

By running this program and providing the initial values for the two numbers, it will swap the values and display the result.

This approach leverages the power of Python's multiple assignment feature, allowing us to swap values between variables in a concise and elegant manner, without the need for a temporary variable.

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Program to Swap Two Variables in Python : Video