[Python] How do I create a custom mathematical expression formula that describes an ethereum...

I'm coding in python and I'm trying to create my own custom mathematical formula expression that will describe how a private key turns into an address. I know that this isn't commonly done but I'm trying to use this so I can set up my own cryptocurrency app that let's me perform tasks that I will use for this.

By mathematical expression I mean something that is like y = (ax + b) but it will turn a private key into an address using the formula.

The code I'm using so far is posted below.

@combomethod
def from_key2(self, private_key: PrivateKeyType) -> LocalAccount:
#Put formula in integer3 to calculate address then put formula outside parenthesis


integer2 = LocalAccount(keys.PrivateKey(private_key.to_bytes(32, 'big')), self).address
integer3 = 'formula here from variable integer2'

return integer3


This is a copy of the from_key from Account.from_key() in eth_account. It turns a private key integer into an address. I want to use that formula to create my own mathematical expression in integer3 that will let me do the same thing but except I can use a mathematical expression to do it for my cryptocurrency platform.

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