Python Coding Challange - Question With Answer(01110225)

 

How it works:

1. List Initialization:

   • numbers = [1, 2, 3, 4, 5] creates a list of integers.

2. Indexing from the End:

   • len(numbers) calculates the length of the list, which is 5 in this case.
   • len(numbers) - 1 gives the index of the last element in the list (5 - 1 = 4), because indexing in Python starts at 0.

3. Reverse Traversal:

   • The while loop begins with i = 4 (the last index) and keeps running until i >= 0.
   • Inside the loop, numbers[i] accesses the element at the current index (i), which starts from the last element and moves backward.

4. Printing Elements:

   • print(numbers[i], end=' ') prints the current element in reverse order, with all elements on the same line because end=' ' prevents a newline after each print.

5. Decrementing the Index:

   • i -= 1 decreases the value of i by 1 in each iteration, effectively moving to the previous element in the list.

6. Stopping the Loop:

   • When i becomes -1, the condition i >= 0 is no longer true, so the loop stops.

Example Output:

5 4 3 2 1