Swap of two two numbers in a list

Problem to swap the two two number in a list. This concept is only applicable for even length of the given array.

Example-1:

Input    : n = [ 3, 2, 0, 1]
Output   : [2,3,1,0]  

Example-2:

Input    : n = [ 5, 7, 4, 3, 8, 6]
Output   : [7,5,3,4,6,8]  

Solution

n = [ 3, 2, 0, 1]

for i in range(0,len(n),2):

    n[i],n[i+1] = n[i+1],n[i]

print(n)

Output

[2,3,1,0]