Python3 program to swap elements

Question

def swapPositions(list, pos1, pos2):
    
    list[pos1], list[pos2] = list[pos2], list[pos1]
    return list

List = [23, 65, 19, 90]
pos1, pos2 = 1, 3

print(swapPositions(List, pos1-1, pos2-1))

i dont understand why "pos2-1" is used here why did they use minus one why doesn’t it work without minus one??

Asked By: Asra Hussain

||

Source

Answer 1

The reason why it takes "Pos2-1" is, the list index starts with 0(zero)

So

index    List
0         23
1         65
2         19
3         90

So if you don’t give the "-1", then the function will take the index values of 1 and 3, which is 65 and 90.

If you find the explanation useful, accept it and vote for it

Answered By: Pravin

Python3 program to swap elements

Question:

Answers: