Python - ¿Cómo operar con variables de distintas funciones?

def elem1():

  a=x

  b=y

  c=z

def elem2():

  a=2x

  b=2y

  c=2z

def element1():

    a = 2

    yield a

    b = 3

    yield b

    c = 4

    yield c

def element2():

    a = 5

    yield a

    b = 1

    yield b

    c = 9

    yield c

def getMajor(n1, n2):

    return f"El primer elemento es mayor" if n1 > n2 else f"El segundo elemento es mayor"

if __name__ == "__main__":

    x = element1()

    y = element2()

    for i in range(3):

        print(getMajor(next(x), next(y)))