not in python

1# Using "if not" is practically saying that, 'if this condition is false......'
2a = False
3if not a:
4  print("a is False")
5  
6# IS SAME AS:
7
8if a == False:
9  print("a is False")

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

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

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

1# False
2print(not(1 == 1))
3
4# True
5print(not(1 == 2))

1if not x