What is the difference between is and == in Python?

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What’s the Difference Between is and == in Python?

In Python, the == operator checks if two objects have the same value, while the is operator checks if they refer to the exact same object in memory. For instance, two lists with identical content—[1, 2, 3] == [1, 2, 3]—returns True, but [1, 2, 3] is [1, 2, 3] returns False, because they’re distinct objects.

This matters. == invokes the object's __eq__() method to compare content, while is compares object identity (memory address via id()). A common pitfall arises with small immutable types: Python may “intern” small integers or strings (e.g. between –5 and 256), meaning a = 100; b = 100; a is b might be True, even though they’re separate variables—this behavior is an implementation detail, reinforcing that is shouldn't be used for value comparison.

Notably, None is a singleton in Python—using is (if x is None:) is the preferred, idiomatic and safe way to compare against None, as opposed to ==.

Our Full Stack Python Course delivers this Quality Thought—clarity around subtle, powerful Python distinctions. We ground you in core concepts like identity vs. equality, helping educational students master Python fundamentals with confidence. Through hands-on labs, code examples, and best practices, we ensure learners see exactly when to use == and when is, avoiding bugs and writing more expressive code.

Conclusion

Understanding the difference between is and == isn’t just academic—it’s foundational to writing robust Python code. It empowers educational students to choose the right tool for comparing by value or identity. In our Full Stack Python Course, we help you internalize these concepts through engaging instruction and real-world examples. Quality Thought is woven throughout our materials, ensuring you don’t just memorize, but truly understand. What subtle Python nuance will you master next?

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