Which magic method does hasattr call?

Question

Which magic method method does hasattr call?

getattr(__o, name) can also be called as __o.__getattr__(name)

setattr(__o, name) can also be called as __o.__setattr__(name)

But what is the equivalent for hasattr?

I know the associated magic method for the in keyword is __contains__.

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Answer 1

There is no specific dunder method for hasattr(). It’s essentially equivalent to:

def hasattr(object, name):
    try:
        getattr(object, name)
        return True
    except AttributeError:
        return False

So it’s dependent on the same dunder methods used by getattr().

Answered By: Barmar

Answer 2

The documentation for hasattr specifically states that

This is implemented by calling getattr(object, name) and seeing whether it raises an AttributeError or not.

That means that the __getattr__ and __getattribute__ are the dunders you are most concerned about.

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