Python program to interchange first and last elements in a list

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# make a function to swap the elements
def swap(list, n):
    # swap the first element with last and last element with first elements
    list[0], list[n-1] = list[n-1], list[0]
    # return the list
    return list

# initilize the array
list = [13, 21, 24, 55, 64, 74]
n = len(list)

# print the result
print(swap(list, n))