Python 3.14 Changes Type Hints Forever: Lazy Annotations Explained

Overview

Up until now, Python type annotations were evaluated "eagerly" - you needed to have an object defined before you could use it as an annotation. With Python 3.14, the default behavior has changed: Type annotations are now evaluated "lazily", as needed, for better performance and more flexibility. This video compares 3.14's new behavior with the way Python's handled annotations in previous versions, with recommendations for how to adapt to the new behavior.

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