Slicing

Syntax [x:y:z]:

• x: start index
• y: end index (exclusive)
• z: take very nth element.
  • For example, if z = 1 it takes every elements
  • if z = 2 it takes every 2nd elements
  • if z is negative, it will take in reverse

elems = list(range(10))
print(elems[::-1]) # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
print(elems[::-2]) # [9, 7, 5, 3, 1]