metaclasses_class_construction.py

class A:
    a = 1
    b = 'hello'

    def f(self):
        return 42

def make_A():
    name = 'A'
    bases = ()

    a = 1
    b = 'hello'

    def f(self):
        return 42

    namespace = {'a': a, 'b': b, 'f': f}
    A = type(name, bases, namespace)
    return A
A = make_A()

def make_A_more_accurate():
    name = 'A'
    bases = ()
    namespace = type.__prepare__(name, bases)
    body = (
"""
a = 1
b = 'hello'

def f(self):
    return 42
"""
)
    exec(body, globals(), namespace)
    A = type(name, bases, namespace)
    return A
A = make_A_more_accurate()



def main():
    x = int()
    print(f'{x=}')

    B = type('B', (), {})
    print(f'{B=}')


if __name__ == '__main__':
    main()