How to detect touch screen clicks in python?

To detect if an image has been touched, you can use the MOUSEBUTTONDOWN event. See Pygame mouse clicking detection.

Load the image with pygame.image.load(). Crate the bounding rectangle (pygame.Rect). Create a pygame.Mask from the image with pygame.mask.from_surface:

image = pygame.image.load('image.png').convert_alpha()
image _rect = image.get_rect(topleft = (x, y))
image_mask = pygame.mask.from_surface(image)

Use the MOUSEBUTTONDOWN event to detect if the mouse is clicked in the rectangular area of the image. Check if the corresponding bit in the image mask is set:

for event in pygame.event.get():
    if event.type == pygame.MOUSEBUTTONDOWN:
        image_x, image_y = event.pos[0] - image_rect.x, event.pos[1] - image_rect.y
        if image_rect.collidepoint(event.pos) and image_mask.get_at((image_x, image_y)):
            print("touched")

Minimal example:

import pygame

pygame.init()
window = pygame.display.set_mode((400, 400))
font = pygame.font.SysFont(None, 100)
clock = pygame.time.Clock()
text = font.render("Text", True, (255, 255, 0))

bomb = pygame.image.load('Bomb-256.png').convert_alpha()
bomb_rect = bomb.get_rect(center = window.get_rect().center)
bomb_mask = pygame.mask.from_surface(bomb)
click_count = 0
click_text = font.render('touch: ' + str(click_count), True, "black")

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False 
        if event.type == pygame.MOUSEBUTTONDOWN:
            image_x, image_y = event.pos[0] - bomb_rect.x, event.pos[1] - bomb_rect.y
            if bomb_rect.collidepoint(event.pos) and bomb_mask.get_at((image_x, image_y)):
                click_count += 1
                click_text = font.render('touch: ' + str(click_count), True, "black")

    window.fill((255, 255, 255))
    window.blit(bomb, bomb_rect)
    window.blit(click_text, click_text.get_rect(topleft = (20, 20)))
    pygame.display.flip()

pygame.quit()
exit()