问我在这条python中遗漏了什么？这是一个简单的程序来订购3个术语，而最后一个订单部分不工作

EN

def SWAP(x,y):
    w = x
    x = y
    y = w
    return x,y

def ORDER(x,y,z):
    if x > z:
        x,z=SWAP(x,z)
    if x > y:
        x,y=SWAP(x,y)
    if y > z:
        y,z=SWAP(y,z)
    print(f'{x}<{y}<{z}')

a = 5
b = 8

a,b = SWAP(a,b)

Here I am calling SWAP with `a,b` who have values `5,8` currently, 
Now SWAP returns `8,5`as response. I am storing `8,5` into `a,b`. 

So Now a becomes 8 and b becomes 5. 

All the other logic is same as you wrote for comparing.