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Bubble Sort - Python - GeeksforGeeks

Last Updated : 23 Jul, 2025

Bubble Sort is the simplest sorting algorithm that works by repeatedly swapping the adjacent elements if they are in the wrong order. 

• Bubble Sort algorithm, sorts an array by repeatedly comparing adjacent elements and swapping them if they are in the wrong order.
• The algorithm iterates through the array multiple times, with each pass pushing the largest unsorted element to its correct position at the end.
• Code includes an optimization: if no swaps are made during a pass, the array is already sorted, and the sorting process stops.

Below is the Python Implementation of Bubble Sort:

def bubble_sort(arr):
  
    # Outer loop to iterate through the list n times
    for n in range(len(arr) - 1, 0, -1):
        
        # Initialize swapped to track if any swaps occur
        swapped = False  

        # Inner loop to compare adjacent elements
        for i in range(n):
            if arr[i] > arr[i + 1]:
              
                # Swap elements if they are in the wrong order
                arr[i], arr[i + 1] = arr[i + 1], arr[i]
                
                # Mark that a swap has occurred
                swapped = True
        
        # If no swaps occurred, the list is already sorted
        if not swapped:
            break


# Sample list to be sorted
arr = [6,6,2]
print("Unsorted list is:")
print(arr)

bubble_sort(arr)

print("Sorted list is:")
print(arr)

Unsorted list is:
[39, 12, 18, 85, 72, 10, 2, 18]
Sorted list is:
[2, 10, 12, 18, 18, 39, 72, 85]

Time Complexity:  O(n²). However in practice, this optimized version might take less time as when array gets sorted, function would return.
Auxiliary Space: O(1).

Please refer complete article on Bubble Sort for more details! 

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