is not in python

1x = 10
2if not x:
3    print("True")
4else:
5    print("False")

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

1arr = ['a','b','c','d','e','f']
2
3if 'g' not in arr:
4    print('g is not in the list')

1result is not None

1boolean = False
2
3if not boolean: #Boolean is false.
4  print("No")
5else: #Boolean is True
6  print("Yes")

1a = False
2if not a:
3    yourFunction()