Shortest way to *interchange first and last* value of a list [Python]

#def the function to interchange

#We'll do this by creating tuplets and alter the sequence of first and last values on...

#both sides

def interchage(mylist):

    mylist[0], mylist[-1] = mylist[-1], mylist[0]

    return mylist

   

   

given_list = [1, 2, 8, 1, 5, 6]

interchaged_list = interchage(given_list)

print("interchanged list is", interchaged_list)     

OUTPUT: interchanged list is [6, 2, 8, 1, 5, 1]

Now to understand that completely,

Indexing starts from `0` for the first element, and it continues incrementally for

the subsequent elements. So, for a list with six elements, the indices would be:

```

Index:   0   1   2   3   4   5

Value:   1   2   8   1   5   6

```

To access elements from the end of the list, you can use negative indexing. The

negative indices start from `-1` for the last element and continue detrimentally

for the preceding elements. For the same list, the negative indices would be:

```

Index:  -6  -5  -4  -3  -2  -1

Value:   1   2   8   1   5   6

```

So, with the positive indices, you count from `0` to `n-1`

(where `n` is the length of the list), and with negative indices, you count

from `-1` to `-n`.