It's British, innit?

british.py

class British(type):
    def __call__(cls, *args):
        foo = cls.__new__(cls)
        foo.__innit__(*args)

        return foo

innit.py

from british import British

class Foo(metaclass=British):
    def __init__(self):
        print("Not here")

    def __innit__(self):
        self.x = 10

if __name__ == "__main__":
    a = Foo()

    print(a.x)