按下某个键时，将变量增加1

Question

我有我想要一个，当一个键减少可变状态计数器a接一个，当被压，增加d按下键。

我提出了一个问题的灵感：当按下一个键时，只增加一个，但是我的代码没有按预期工作，当我将was_pressed变量重置为false ，状态计数器开始增加。

running = True
state_counter = 0
number_of_states = 0
was_pressed = False

import pygame

while running:
    for event in pygame.event.get():
        if event.type == QUIT or (event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE):
        # The user closed the window or pressed escape
        running = False

        if event.type == KEYDOWN and event.key==K_a:
            if not was_pressed:
                state_counter -= 1
                print("state_counter %d times"%state_counter)
                was_pressed = True
            else:
                was_pressed = False

        elif event.type == KEYDOWN and event.key == K_d:
            if not was_pressed:
                state_counter += 1
                print("state_counter %d times"%state_counter)
                was_pressed = True
            else:
                was_pressed = False
pygame.quit()
print('Done!, state counter is: ', state_counter)

问题是我需要增量和减量变量（这就是与上述问题的区别），当然我需要变量来改变每次按键（这可能也是上一个问题的情况）但我无法做到这一点）。 我也不能time.sleep()因为我不想让程序睡觉。

任何帮助表示感谢，非常感谢您提前。

Answer 1

KEYDOWN事件仅在按下键时发生一次。 当密钥保持时，它不会连续出现。 所以不需要was_pressed状态：

while running:
    for event in pygame.event.get():
        if event.type == QUIT or (event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE):
            # The user closed the window or pressed escape
            running = False

        if event.type == KEYDOWN and event.key==K_a:
            state_counter -= 1
            print("state_counter %d times"%state_counter)

        elif event.type == KEYDOWN and event.key == K_d:
            state_counter += 1
            print("state_counter %d times"%state_counter)

Answer 2

import pyautogui
import pygame
Number_of_Presses = 0
for event in pygame.event.get():
    if event.type == pygame.KEYDOWN:
       if event.key == pygame.K_a:
            Number_of_Presses -= 1
            print (Number_of_Presses)
    if event.type == pygame.KEYDOWN:
       if event.key == pygame.K_d:
            Number_of_Presses += 1
            print (Number_of_Presses)