如何在多重绑定中为1个绑定传递常量值？

lambda x: (x, 'constant_value')

import functools

def func(x, constant_value):
    return (x, constant_value)

const_func = functools.partial(func, constant_value='constant_value')

import types

class ConstNamespace(types.SimpleNamespace):
    def __init__(self, constant_value, **kwargs):
        super().__init__(**kwargs)
        self.constant_value = constant_value

const_ns = ConstNamespace(constant_value='constant_value')