What is "is not" operator in Python?

In Python is not membership operator evaluates to false if the variables on either side of the operator point to the same object and true otherwise. For example −

>>> a = 10
>>> b = 20
>>> id(a), id(b)
(1581561184, 1581561504)
>>> a is not b
True

Since id() of variables a and b are different is not operator returns true.

Pythonic

Updated on: 30-Jul-2019

>> a = 10 >>> b = 20 >>> id(a), id(b) (1581561184, 1581561504) >>> a is not b True Since id() of variables a and b are different is ','sharer','toolbar=0,status=0,width=580,height=325');" href="javascript: void(0)" title="Share on Facebook"> >> a = 10 >>> b = 20 >>> id(a), id(b) (1581561184, 1581561504) >>> a is not b True Since id() of variables a and b are different is ','sharer','toolbar=0,status=0,width=580,height=325');" href="javascript: void(0)" title="Share on LinkedIn">

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