I was wondering if there was a magic method in Python that supported the type() built-in function, that would allow you to set a custom value to be returned.
Is there a Magic Method for type() in python?
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No, there is no such method. An instance's type is not something you can dynamically alter when querying for it, as that would be type-specific behaviour, but you suddenly cannot determine the type that is defining that behaviour!
You can assign a different class to
instance.__class__
, but then you'd materially alter the behaviour of that instance, and it is not the instance itself that then changes type whentype()
is applied to the instance.Rather than using
type()
, use theisinstance()
andissubclass()
functions instead, and use abstract base types; it is the type object that is then responsible for claiming a specific class or instance as a subclass or instance of the given type, respectively. They can do this via the__issubclass__
and__isinstance__
hooks.