python 3.x - stuck on pygame.draw.rect() -


im trying draw shape pygame.draw.rect() when press key shape wont stay when key or event happen , shape moves ever ship moves want move when shot , stay in place , shape wont stay on surface after release key 

import pygame  pygame.init()  display_width = 800 display_hight = 600 colors = {"black": (0, 0, 0), "white": (255, 255, 255), "green": (0, 255, 0), "red": (255, 0, 0), "blue": (0, 0, 255)} ship_width = 75 ship_hight = 72 gamedisplay = pygame.display.set_mode((display_width, display_hight)) pygame.display.set_caption('test') clock = pygame.time.clock()  shipimg = pygame.image.load('d:\\index.png')  def ship(x, y):     gamedisplay.blit(shipimg, (x, y))    def game_loop():     x = (display_width * 0.41)     y = (display_hight * 0.8)     x_change = 0     fire_start_y = y - ship_hight     fire_start_x = x + (ship_width / 2)      gameexit = false       while not gameexit:         if fire_start_y < 0:             fire_start_y = y - 30         event in pygame.event.get():             if event.type == pygame.quit:                 gameexit = true             if event.type == pygame.keydown:                 if event.key == pygame.k_left:                     x_change = -5                 if event.key == pygame.k_right:                     x_change = 5              if event.type == pygame.keyup:                 if event.key == pygame.k_left or event.key == pygame.k_right:                     x_change = 0         x += x_change          gamedisplay.fill(colors["white"])          if event.type == pygame.keydown:             if event.key == pygame.k_x:                 pygame.draw.rect(gamedisplay, colors["green"], [fire_start_x, fire_start_y, 2, 10])          ship(x, y)         if x <= 0 or x >= display_width - ship_width:             x -= x_change         fire_start_y -= 5         fire_start_x = x + (ship_width / 2)           pygame.display.flip()         clock.tick(60)   game_loop() pygame.quit()

i tried code manage disappearing problem made worse ever lopping after press key once 

        if event.type == pygame.keydown:             if event.key == pygame.k_x:                 pygame.draw.rect(gamedisplay, colors["green"], [fire_start_x, fire_start_y, 2, 10])                 fire_start_x = x + (ship_width / 2)         elif event.type == pygame.keyup:             if event.key == pygame.k_x:                 pygame.draw.rect(gamedisplay, colors["green"], [fire_start_x, fire_start_y, 2, 10])                 fire_start_x = x + (ship_width / 2)

thanks guys found answer looking in how create bullets in pygame?

creating list of bullets , use append method add direction fo every bullet shot when press x key , removeing them list if out of game surface

here code looks 

bullets = [] bullet_width = 2 bullet_hight = 10 def game_loop():     x = (display_width * 0.41)     y = (display_hight * 0.8)     x_change = 0     bullet_y = y - (ship_hight/2)      gameexit = false      while not gameexit:         bullet_x = x + (ship_width / 2)         event in pygame.event.get():             if event.type == pygame.quit:                 gameexit = true             if event.type == pygame.keydown:                 if event.key == pygame.k_left:                     x_change = -5                 if event.key == pygame.k_right:                     x_change = 5                 if event.key == pygame.k_x:                     bullets.append([bullet_x,bullet_y])             if event.type == pygame.keyup:                 if event.key == pygame.k_left or event.key == pygame.k_right:                     x_change = 0         x += x_change          gamedisplay.fill(colors["white"])          bullet in bullets:             pygame.draw.rect(gamedisplay, colors["green"], (bullet[0], bullet[1], bullet_width, bullet_hight))          ship(x, y)         if x <= 0 or x >= display_width - ship_width:             x -= x_change         bullet in bullets:             bullet[1] -= 5             if bullet[1] < 0:                 bullets.remove(bullet)         pygame.display.flip()         clock.tick(60)

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