pygame.key.get_pressed()返回包含键当前状态的列表。按住某个键时，该键的状态为True，否则为False。使用pygame.key.get_pressed()评估是否一个键被连续按下。
while True:
pressed_key= pygame.key.get_pressed()
if pressed_key[pygame.K_UP]:
# the code in this condition is executed as long UP is hold down
# [...]
当键的状态更改时，键盘事件（请参阅pygame.event模块）仅发生一次。KEYDOWN每次按下一个键，事件就会发生一次。KEYUP每次释放钥匙时发生一次。
while True:
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
# The following code is executed once, every time when ESC is pressed.
# [...]
if event.type == pygame.KEYUP:
if event.key == pygame.K_ESCAPE:
# The following code is executed once, every time when ESC is released.
# [...]
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