python中坐标怎么表示

def change_directions(e):      #e表示移动方向,list类型

    moves = { "up":(0,1),"down":(0,-1),"right":(1,0),"left":(-1,0)}

    x,y = (0,0)

    if e:

        for v in e:

            dx,dy = moves[v]

            x += dx

            y += dy

            print((x,y))

tup1 = ('physics', 'chemistry', 1997, 2000)

tup2 = (1, 2, 3, 4, 5 )

tup3 = "a", "b", "c", "d"

tup1 = ()

tup1 = (50,)