Python Program to Implement Selection Sort

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This is a Python program to implement selection sort.

Problem Description

The program sorts a list by selection sort.

Problem Solution

1. Create a function selection_sort that takes a list as argument.
2. Inside the function create a loop with a loop variable i that counts from 0 to the length of the list – 1.
3. Create a variable smallest with initial value i.
4. Create an inner loop with a loop variable j that counts from i + 1 up to the length of the list – 1.
5. Inside the inner loop, if the elements at index j is smaller than the element at index smallest, then set smallest equal to j.
6. After the inner loop finishes, swap the elements at indexes i and smallest.

Program/Source Code

Here is the source code of a Python program to implement selection sort. The program output is shown below.

def selection_sort(alist):
    for i in range(0, len(alist) - 1):
        smallest = i
        for j in range(i + 1, len(alist)):
            if alist[j] < alist[smallest]:
                smallest = j
        alist[i], alist[smallest] = alist[smallest], alist[i]
 
 
alist = input('Enter the list of numbers: ').split()
alist = [int(x) for x in alist]
selection_sort(alist)
print('Sorted list: ', end='')
print(alist)
Program Explanation

1. The user is prompted to enter a list of numbers.
2. The list is passed to the selection_sort function.
3. The sorted list is displayed.

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Runtime Test Cases
Case 1:
Enter the list of numbers: 3 1 4 5 2 6
Sorted list: [1, 2, 3, 4, 5, 6]
 
Case 2:
Enter the list of numbers: 2 10 5 38 1 7
Sorted list: [1, 2, 5, 7, 10, 38]
 
Case 3:
Enter the list of numbers: 5 3 2 1 0
Sorted list: [0, 1, 2, 3, 5]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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