Pygame Test code showing pygame draw commands vs surfaces with alpha

import pygame

# Draw commands don't use alpha the same way as surfaces.

def main(caption, size, flags=0):
    pygame.display.set_caption(caption)
    display = pygame.display.set_mode(size, flags)
    drect = display.get_rect()
    clock = pygame.time.Clock()
    running = True
    delta = 0
    fps = 60

    color = pygame.Color('green')
    color.a = 80
    rcolor = pygame.Color('red')
    rcolor.a = 150

    red_box = pygame.Surface((40, 40), pygame.SRCALPHA)
    red_box.fill(rcolor)
    green_box = pygame.Surface((700, 100), pygame.SRCALPHA)
    green_box.fill(color)
    pygame.draw.rect(green_box, rcolor, (10, 10, 40, 40))
    green_box.blit(red_box, (120, 10))

    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        display.fill('black')
        pygame.draw.line(display, 'dodgerblue', (drect.centerx, 5), (drect.centerx, 400), 3)
        display.blit(green_box, (50, 150))
        pygame.draw.rect(display, color, (50, 20, 700, 100))

        pygame.display.flip()
        delta = clock.tick(fps)

pygame.init()
main('Testing', (800, 600))
pygame.quit()