class Classname(object):
    def __init__(self, p1, p2=''):
        self.p1 = p1
        self.p2 = p2

    # @Classname.decorator
    def method_one(self, p_list):
        return function_one(p_list)

    def method_one(self, p_list):
        return function_two(p_list)

    def method_one(self, p_list):
        return function_three(p_list)

A lot of them are like this method_one calls funciton_one, but now the call function_xxx needs to be changed depending on whether the user passes in p2 The method, I hope to change it to something like this
function_xxx I cannot modify the code.

    def method_two(self, p_list):
        if self.p2:
            return function_two(self.p2, p_list)
        else:
            return function_two(p_list)

I have considered using a decorator to handle it, but it seems that using a decorator can only wrap a layer around the function, but cannot intrusively change the calling method. Is there any suitable solution here?
If it is possible to modify the calling method based on self.p3 self.p4 in the future, is there any better solution?