python not with or code example

Example 1: python not in

arr = ['a','b','c','d','e','f']

if 'g' not in arr:
    print('g is not in the list')

Example 2: is not in python

li = [1,2,'a','b']
if 'hello' not in li:
    print('hello is not in the list')

Example 3: if not python

boolean = False

if not boolean: #Boolean is false.
  print("No")
else: #Boolean is True
  print("Yes")