找出了一个hack：
PS4按钮编号如下：
0 = SQUARE
1 = X
2 = CIRCLE
3 = TRIANGLE
4 = L1
5 = R1
6 = L2
7 = R2
8 = SHARE
9 = OPTIONS
10 = LEFT ANALOG PRESS
11 = RIGHT ANALOG PRESS
12 = PS4 ON BUTTON
13 = TOUCHPAD PRESS
为了弄清楚哪个按钮被按下，我使用j.get_button(int)，传入匹配的按钮整数。
例：
import pygame
pygame.init()
j = pygame.joystick.Joystick(0)
j.init()
try:
while True:
events = pygame.event.get()
for event in events:
if event.type == pygame.JOYBUTTONDOWN:
print("Button Pressed")
if j.get_button(6):
# Control Left Motor using L2
elif j.get_button(7):
# Control Right Motor using R2
elif event.type == pygame.JOYBUTTONUP:
print("Button Released")
except KeyboardInterrupt:
print("EXITING Now")
j.quit()
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