How python slicing [::-1] (colon colon minus one) reverse the sequence?

Slicing syntax: sequence[start:end:step]

If start and end omitted with POSITIVE step value:

• start = 0
• end = len(string)

Example:

- list1 = [1,2,3,4,5]

- list1[::2] => list1[0:6:2] => [1, 3, 5]

If start and end omitted with NEGATIVE step value:

• start = len(string)-1
• end = -len(string)-1

Example:

- list1 = [1,2,3,4,5]

- list1[::-1] => list1[4:-6:-1] => [5, 4, 3, 2, 1]