Python checks whether the object you're referring to has the same memory address as the global None object - a very, very fast comparison of two numbers. By comparing equality , Python has to look up whether your object has an __eq__ method.

In this quick and practical tutorial, you'll learn when to use the Python is, is not, == and != operators. You'll see what these comparison operators do under the hood, dive into some quirks of object identity and interning, and define a custom class.

Dec 11, 2020 · The != operator compares the value or equality of two objects, whereas the Python is not operator checks whether two variables point to the same object in memory.

Nov 7, 2021 · What does “is not” in Python do? The “is not” operator is used to verify if 2 references are not pointing to the same object. Essentially the “is not” operator does the opposite of what the “is” operator does.

The Python 'is not' Operator. The 'is not' operator is simply the negation of the 'is' operator. It returns True if the objects are not the same object in memory, and False if they are. Let's look at some examples:

May 2, 2023 · The is not operator is a binary operator that checks if two variables do not refer to the same object. It evaluates to False if the variables on both sides of the operator point to the same object, and True otherwise.

Apr 8, 2024 · Use the is operator to check if a variable is None in Python, e.g. if my_var is None:. The is operator will return True if the variable is None and False otherwise. If you need to check if a variable is NOT None, use the is not operator.

In this Python Tutorial, we learned about is not Operator, its syntax, and usage, with examples. In Python, is not Operator is used to check if two variables does not have the same object.

Aug 2, 2024 · To check if a variable is not None in Python, the most recommended approach is to use the is not operator. This method checks for identity, ensuring that the variable and None are not the same object.

Feb 14, 2025 · We have two identity operators in python as well: is: it returns True if both variables are referenced the same object in memory. is not: gives True if both variables point to different objects...