PylazyLab.py

class Product(object):
    url: str
    
    def __getattribute__(self, name):
        ret = object.__getattribute__(self, name)
        if isinstance(ret, property):
            return ret.__get__(self)
        return ret

val = None

class LazyVal(object):
    def get(self):
        return getattr(self, '__val')
    def set(self, val):
        setattr(self, '__val', val)


def lazy_getter(self):
    return val

def Lazy():
    return property(lazy_getter)


product = Product()
product.url = Lazy()  # Lazy(val)

print(product.url)
val = 9
print(product.url)