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Example: Validating Function Arguments
As a final example of the utility of decorators, this section develops a function decorator that automatically tests whether arguments passed to a function or method are within a valid numeric range. It’s designed to be used during either development or production, and it can be used as a template for similar tasks (e.g., argument type testing, if you must). Because this chapter’s size limits has been broached, this example’s code is largely self-study material, with limited narrative; as usual, browse the code for more details.
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