Просто получите возврат одной функции и введите ее в другую.
class Obj:
def func1(self):
return "something"
# Assuming func2 is inside class.
def func2_class(self, something):
print(something)
# Assuming func2 is outside class.
def func2(something):
print(something)
obj = Obj()
something = obj.func1()
func2(something) # Outside class.
obj.func2(something) # Inside class.