[Python-ideas] Bad programming style in decorators?

[u8y7541 The Awesome Person]

In most decorator tutorials, it's taught using functions inside functions.
Isn't this inefficient because every time the decorator is called, you're
redefining the function, which takes up much more memory? I prefer defining
decorators as classes with __call__ overridden. Is there a reason why
decorators are taught with functions inside functions?

-- 
-Surya Subbarao
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