Web Reference: Dec 2, 2006 · Function annotations are nothing more than a way of associating arbitrary Python expressions with various parts of a function at compile-time. By itself, Python does not attach any particular meaning or significance to annotations. Until that day (which will never come), the main uses of Python's function annotations will be the one-off uses described in the other answers. For the time being, you can forget about smart static analyzers, compiler assurances, java-based tool chains, etc. Function annotations are a Python feature that allows you to add arbitrary metadata to function parameters and return values. Python 3.0, with enhancements in later versions. Primarily for documentation and type hinting, but annotations can be used for other purposes as they do not affect the runtime behavior of the program. return f"Hello, {name}"
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