What does 'is not' operator do in Python?

In Python, is and is not operators are called identity operators. Each object in computer's memory is assigned a unique identification number (id) by Python interpreter. Identity operators check if id() of two objects is same. 'is not' operator returns true of id() values are different and false if they are same.

>>> a=10
>>> b=a
>>> id(a), id(b)
(490067904, 490067904)
>>> a is not b
False
>>> a=10
>>> b=20
>>> id(a), id(b)
(490067904, 490068064)
>>> a is not b
True

Malhar Lathkar

Published on 13-Feb-2018 14:13:44