Question from the Python test

What is the role of the Base metaclass in this Python code?

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What is the role of the Base metaclass below?

class Base(type):
    def __new__(cls, name, bases, attrs):
        super_new = super().__new__
        attrs['custom_attribute'] = False
        return super_new(cls, name, bases, attrs)


class Middle(metaclass=Base):
    def __init__(self, firstname):
        self.firstname = firstname


class Bottom(Middle):
    pass
Author: John PendenqueStatus: PublishedQuestion not yet passed
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