Why doesn't it show movement along "y"?

Question

pygame

Hello!
Why doesn't it show y movement?

if e.type == p.MOUSEMOTION:
        xb = p.mouse.get_pos()
        xb2 = xb[x]
        xb3 = xb[y]
        print(str(xb3))

the main thing when I drive around the screen, in the print it shows the movement along the X, although I entered the variable "xb3" in the print, that is, to show the movement along the game