Web Reference: Jul 12, 2025 · By using the assert statement, we can declare that a certain condition must be true at a specific point in our code. If the condition is true, execution continues normally; if it is false, an AssertionError is raised and the program stops (or the error is caught if handled). In this tutorial, you'll learn how to use Python's assert statement to document, debug, and test code in development. You'll learn how assertions might be disabled in production code, so you shouldn't use them to validate data. You'll also learn about a few common pitfalls of assertions in Python. Definition and Usage The AssertionError exception occurs when an assert statement fails. You can handle the AssertionError in a try...except statement, see the example below. Read more about the assert keyword in our assert Keyword chapter.
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