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In this article, delve into the world of Python Bubble Sort, a fundamental algorithm in computer science for organising and sorting data. Begin with understanding the essential logic behind the Python Bubble Sort algorithm, and learn how it works by analysing a step-by-step example. After grasping the basics, discover how to implement the Bubble Sort algorithm in Python and compare…
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Jetzt kostenlos anmeldenIn this article, delve into the world of Python Bubble Sort, a fundamental algorithm in computer science for organising and sorting data. Begin with understanding the essential logic behind the Python Bubble Sort algorithm, and learn how it works by analysing a step-by-step example. After grasping the basics, discover how to implement the Bubble Sort algorithm in Python and compare the basic implementation with an optimised version. Furthermore, explore the various applications of Python Bubble Sort, such as sorting strings in alphabetical order and uncover the practical use cases in computer science. Throughout this article, become well-versed in the Python Bubble Sort algorithm and gain crucial skills for future programming endeavours.
In computer science, sorting is a crucial task that aims to arrange elements in a particular order. The Python bubble sort algorithm is one of the easiest sorting algorithms in this domain. It works by repeatedly stepping through the elements of a list or an array and comparing each pair of adjacent elements. If the elements are found to be in the wrong order, the algorithm swaps them. This process continues until there are no more swaps needed. This iterative technique ensures that the largest element "bubbles up" to the end of the list during each pass.
The bubble sort algorithm has a worst-case time complexity of \(O(n^2)\), where 'n' represents the number of elements in the list. However, with its simplicity and ease of implementation, it remains a popular choice for educational purposes and sorting relatively small datasets.
To get a better understanding of the Python bubble sort algorithm, let us discuss a step-by-step example in detail, taking an unsorted list as our input.
Consider the following list as our input:
We will now walk through the steps taken by the bubble sort algorithm to sort this list in ascending order:
1. Compare the first two elements (5 and 1). Since 5 > 1, swap them: 1, 5, 4, 2, 8 2. Move to the next pair (5 and 4). Swap them as 5 > 4: 1, 4, 5, 2, 8 3. Continue the process with the next pair (5 and 2) and swap them: 1, 4, 2, 5, 8 4. Proceed to the next pair (5 and 8). As 5 < 8, no swap is needed. Since an entire pass took place without any swaps needed, the list is considered sorted and the algorithm terminates.
Here is a Python code implementation of the bubble sort algorithm:
def bubble_sort(arr):
n = len(arr)
for i in range(n):
for j in range(0, n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
arr = [5, 1, 4, 2, 8]
bubble_sort(arr)
print("Sorted array is:", arr)
In the example above, the bubble sort algorithm is implemented using a Python function called 'bubble_sort'. The function accepts a list 'arr' as its input and sorts it in-place through nested loops. The inner loop ensures that the elements are compared and swapped if they are in the wrong order while the outer loop iterates through the list multiple times. Finally, the sorted list is printed as output.
By optimizing the Python bubble sort algorithm, you can break the outer loop if no swaps occur in the inner loop during an iteration. This early termination indicates that the list is already sorted and no further iterations are required, which can save you significant processing time when sorting already sorted or nearly sorted lists.
The basic implementation of the Python bubble sort algorithm can be achieved using a function, such as 'bubble_sort', that takes a list as its argument and performs the sorting process through nested loops. The outer loop iterates through all the elements of the list, whilst the inner loop compares adjacent elements and swaps them if they are out of order. The inner loop's range decreases during each iteration to prevent comparing sorted elements.
Here's a sample Python code demonstrating the basic implementation of bubble sort:
def bubble_sort(arr):
n = len(arr)
for i in range(n):
for j in range(0, n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
arr = [64, 34, 25, 12, 22, 11, 90]
bubble_sort(arr)
print("Sorted array is:", arr)
To further clarify the code, let's break down its key components:An optimised version of the bubble sort algorithm improves its performance, especially for partially sorted or nearly sorted lists. This optimisation can be achieved by adding a variable that tracks whether any swaps occurred during an iteration. If no swaps occur, the algorithm terminates, as the list is already sorted. This early termination can save a significant amount of time in certain cases.
Below is the Python code for the optimised version of bubble sort:
def optimised_bubble_sort(arr):
n = len(arr)
for i in range(n):
swapped = False
for j in range(0, n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
swapped = True
if not swapped:
break
arr = [64, 34, 25, 12, 22, 11, 90]
optimised_bubble_sort(arr)
print("Sorted array is:", arr)
The optimised bubble sort algorithm has the following key enhancements:Both basic and optimised implementations provide an understanding of the bubble sort algorithm in Python. By using them efficiently in various scenarios, you can optimise your code and achieve better performance while sorting elements in your lists or arrays.
Python Bubble Sort algorithm is commonly implemented in various programming and real-life scenarios for its simplicity, ease of implementation, and understanding. In this section, we discuss some use cases where bubble sort can be effectively used to sort different types of data such as strings and practical applications in computer science.
Bubble sort is not limited to sorting numeric values, it can also be employed to sort strings in alphabetical order. This requires the comparison of two string elements to determine the correct sequence. By comparing the Unicode values of characters in each string, bubble sort can arrange strings in alphabetical order.
Here is a detailed walkthrough of the process:
An example Python code implementation for sorting a list of strings would look like this:
def bubble_sort_strings(arr):
n = len(arr)
for i in range(n):
for j in range(0, n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
string_list = ["banana", "apple", "orange", "grape", "cherry"]
bubble_sort_strings(string_list)
print("Alphabetically sorted list:", string_list)
With the above implementation, the input list of strings is sorted in alphabetical order based on their reference character comparison, which in this case is their first character.
While Python Bubble Sort has its limitations in terms of complexity and efficiency, it remains a popular sorting technique in various practical applications where simplicity and ease of implementation are more important, especially in the following cases:
For example, bubble sort can be used as an introductory topic in a computer science course, allowing students to learn the basic concepts of sorting, comparison, and swapping before moving on to more advanced algorithms.
In summary, Python Bubble Sort is useful for specific applications where simplicity, ease of implementation, and educational potential are prioritised over time complexity. Although other sorting algorithms are more efficient for large datasets or complex data structures, bubble sort continues to serve as a practical solution in some cases, especially for new learners in computer science and in constrained computing environments.
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