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The method to invoke the base function within a metaclass is to call the base class's method using the super() function. For example:

class MyMeta(type):
    def __new__(mcls, name, bases, attrs):
        # Call the base class's __new__() method
        obj = super().__new__(mcls, name, bases, attrs)
        # Add your custom logic here
        return obj

In this example, super().__new__(mcls, name, bases, attrs) calls the __new__() method of the parent type class, which returns a new instance of the class. You can then add your custom logic to the new class object before returning it.