我不能移动我的角色在python空间入侵者游戏拍摄(使用Zelle图形包)

from graphics import GraphWin, Point, Circle

def main():
    win = GraphWin("Space Invaders", 600, 600)
    player = Circle(Point(300, 500), 20)
    player.setFill("blue")
    player.draw(win)

    while True:
        key = win.checkKey()
        if key == "Left":
            player.move(-10, 0)
        elif key == "Right":
            player.move(10, 0)

main()

if key == "Left" and player.getCenter().x > 20:
    player.move(-10, 0)
elif key == "Right" and player.getCenter().x < 580:
    player.move(10, 0)

import time

while True:
    start_time = time.time()
    key = win.checkKey()
    # 移动逻辑...
    time_to_wait = max(0, 0.03 - (time.time() - start_time))
    time.sleep(time_to_wait)