Is there an existing library that inlines the function code instead of their calls to create procedual code?

example:

before:

def add(a, b):
    result = a + b
    return result

tmp = add(2, 3)`

after:

a = 2
b = 3
result = a + b
tmp = result

Does something like this already exist? I have not found anything like this before.

Best Regards!

I tried using the libraries ast and astor