It was stated earlier that attribute access calls are transformed into descriptor calls, but it was not stated how. The quick answer is that __getattribute__(), __setattr__(), and __delattr__() do it. That probably isn’t much of an answer for you, so I’ll dig into it more. These three methods exist on all normal objects, inherited via the object class (and classes inherit it from the type metaclass). As you might imagine, these methods are called when an attribute on an object is retrieved, set, or deleted, respectively, and it is these methods that decide whether to use a descriptor, ...
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