Help me to compress these functions into one please

Question

I have these two functions that are used independently for different purposes
class Neural_network
def __init__(self, input):
self.input = input
..............
def calculate(self,inp):
out = self.sigmoid(dot(inp, self.weights))
return out
def fire(self):
self.output = self.calculate(self.input)

I would like to make one function with two variants, one of which has to have no arguments.
I tried setting the default value to be used when no arguments are given.
def calculate(self, inp = self.input)
It turned out to be impossible because I can't use "self. " syntax while defining a function.
So my question is how to set that default value?
P.S. i need my self.input to be unique for each object, obviously, so it didn't work when I tried just not using the "self. "

Answer 1

Maybe this way you can check if there are no arguments passed, and assign a default value:

def calculate(self, inp):
inp = self.input if inp == None
out = self.sigmoid(dot(inp, self.weights))
return out