Understanding Python Identity Operators

Difference Between Identity and Equality

It's important to distinguish identity from equality in Python.

Equality (using '==') checks if the values of two objects are the same.

Identity (using 'is') checks if two variables point to the exact same object.

• Two different objects can have equal values but different identities.
• 'is' is about object identity, '==' is about value equality.

Using Identity Operators in Python

Identity operators are often used to check if a variable is None or to compare singleton objects.

They are also useful in performance-sensitive code where object identity matters.

• Use 'is' to check if a variable is None: if variable is None:
• Avoid using 'is' to compare values of immutable types like strings or numbers.

Examples of Identity Operators

Let's look at some practical examples demonstrating identity operators.