are not in in python 2.7 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')