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1. New Array of Squares2. New Array with Only Even Elements3. Replace Negatives with 04. Replace Evens with 1, Odds with 05. Swap First & Last Elements6. Reverse Array7. Rotate Left by 18. Rotate Right by 19. Swap Alternate Elements10. Copy Array Manually

Swap First & Last Elements

Swap first and last elements of array.

IntermediatePhase 4 - Level 3: TransformationExample 5 of 10
swap-first-last-elements.py
1# Take array
2n = int(input("Enter array size: "))
3arr = []
4for i in range(n):
5    arr.append(int(input(f"Element {i+1}: ")))
6

7# Swap first and last
8if len(arr) > 0:
9    arr[0], arr[-1] = arr[-1], arr[0]
10

11print(f"After swap: {arr}")

Output

Enter array size: 5
Element 1: 1
Element 2: 2
Element 3: 3
Element 4: 4
Element 5: 5
After swap: [5, 2, 3, 4, 1]

What's going on

Use tuple unpacking to swap.

Key Concepts:

arr[0] is first element
arr[-1] is last element
Swap using tuple assignment

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