我已经创建了代码来查看我的外星人是否已经死亡但不起作用，任何人都可以看到问题。
CODE：
enemies = pygame.sprite.Group(aliens)
if len(enemies) <= 0:
print("game over")
gameover()
完整代码：
#MathsVaders
import pygame, random, time
from pygame.locals import *
import Databaseconnector
import tkMessageBox
pygame.init()
# set up the graphics window
size = [800, 595]
screen = pygame.display.set_mode(size, 0)
screenrect = screen.get_rect()
pygame.display.set_caption("Mathsvaders")
# set some variables
done = False
life = 3
aliens = pygame.sprite.Group()
allsprites = pygame.sprite.Group()
bombs = pygame.sprite.Group()
green = [0, 255, 0]
white = [255, 255, 255]
# create a timer to control how often the screen updates
clock = pygame.time.Clock()
fps = 100
# loads images to use in the game which link in with my classes(further down)
cannon = pygame.image.load("spaceship.png").convert()
cannon.set_colorkey(white)
blast = pygame.image.load("blast.png").convert_alpha()
boom = pygame.image.load("expl.png").convert_alpha()
bomb = pygame.image.load("missile_player.png").convert_alpha()
back = pygame.image.load("rsz_space.png").convert()
enemy = pygame.image.load("sii.png").convert_alpha()
lives2 = pygame.image.load("alien2.png").convert()
lives2.set_colorkey(white)
lives3 = pygame.image.load("alien3.png").convert()
lives3.set_colorkey(white)
lives1 = pygame.image.load("alien1.png").convert()
lives1.set_colorkey(white)
# (Classes)
# the explosion class
class Explosion(pygame.sprite.Sprite):
def __init__(self, x, y):
pygame.sprite.Sprite.__init__(self)
self.image = boom
self.rect = self.image.get_rect()
self.rect.centerx = x
self.rect.centery = y
self.count = 6
def update(self):
self.count -= 1
if self.count < 1:
self.kill()
class scoreClass:
def __init__(self):
self.value = 0
# set a font, default font size 28
self.font = pygame.font.Font(None, 28)
def update(self):
text = self.font.render("Score: %s" % self.value, True, (green))
textRect = text.get_rect()
textRect.centerx = screenrect.centerx
screen.blit(text, textRect)
class Msg:
def __init__(self, words):
# set a font, default font size 28
self.font = pygame.font.Font(None, 28)
self.text = self.font.render(words, True, (green))
self.textRect = self.text.get_rect()
def update(self):
self.textRect.centerx = screenrect.centerx
self.textRect.centery = screenrect.centery
screen.blit(self.text, self.textRect)
# the invader class
class Pi(pygame.sprite.Sprite):
def __init__(self, x, y):
pygame.sprite.Sprite.__init__(self)
aliens.add(self)
self.image = enemy
self.rect = self.image.get_rect()
self.rect.left = x
self.rect.top = y
self.speed = 1
def update(self):
self.rect.right += self.speed
if self.rect.right >= (screenrect.right -5):
self.speed = -1
self.rect.top += self.rect.height
if self.rect.left <= (screenrect.left +5):
self.speed = 1
self.rect.top += self.rect.height
if self.rect.top > screenrect.bottom:
self.kill()
i = random.randrange(1000)
j = self.rect.centerx
if i == 1:
laser_bomb = Bomb(j, self.rect.bottom)
allsprites.add(laser_bomb)
aliens.add(laser_bomb)
class Gun(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = cannon
self.rect = self.image.get_rect()
self.rect.bottom = screenrect.bottom
self.rect.centerx = screenrect.centerx
self.speed=0
def update(self):
self.rect.centerx += self.speed
if self.rect.right >= screenrect.right:
self.rect.centerx = 0
if self.rect.right <= 0:
self.rect.right = screenrect.right
# bomb class
class Bomb(pygame.sprite.Sprite):
def __init__(self, x, y):
pygame.sprite.Sprite.__init__(self)
self.image = bomb
self.rect = self.image.get_rect()
self.rect.centerx = x
self.rect.centery = y
bombs.add(self)
def update(self):
self.rect.centery +=1
# the laser blast class
class Blast(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = blast
self.image.set_colorkey(white)
self.rect = self.image.get_rect()
self.rect.top = (player.rect.top + 5)
self.rect.centerx = player.rect.centerx
self.speed = 0
def update(self):
if self.speed == 0:
self.rect.centerx = player.rect.centerx
self.rect.top -= self.speed
# function to make a sheet of invaders
def invade():
for j in range(10, 200, 120):
for i in range(10):
aliens.add(Pi((i*70)+10, j))
def gameover():
message = Msg("Game Over")
message.update()
player.kill()
shot.kill()
SQL = 'INSERT INTO TblScore(Score, StudentID) VALUES (' + str(score.value) + ', ' + str(8) + ')'
Databaseconnector.INSERT(SQL)
#pygame.quit()
##def gameover():
## message = Msg("Game Over")
## message.update()
## player.kill()
## shot.kill()
## SQL = 'INSERT INTO TblScore(Score, StudentID) VALUES (' + str(score.value) + ', ' + str(8) + ')'
## Databaseconnector.INSERT(SQL)
##
## #pygame.quit()
def gamewon():
# sprites(aliens) == 0
#sprites.aliens == 0
message = Msg("YOU WON, YOUR SCORE WAS " + score + " WELL DONE")
message.update
aliens.kill()
shot.kill()
pygame.quit()
# pre-game window
invade()
message = Msg("Press a key to play.")
allsprites.add(aliens)
key = True
while key:
screen.blit(back, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
if event.type == pygame.KEYDOWN:
for item in (aliens):
item.kill()
key = False
allsprites.update()
allsprites.draw(screen)
message.update()
# set the loop to 40 cycles per second
clock.tick(fps)
# update the display
pygame.display.flip()
# Main Game Starts Here
score = scoreClass()
player = Gun()
shot = Blast()
invade()
allsprites.add(player, aliens, shot)
while done==False:
screen.blit(back, (0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
done=True
if life <= 0:
gamewon()
## elif allsprites == 0:
## gamewon()
else:
# shoots laser missile
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
if shot.speed == 0:
shot.speed = 7
#laser.play()
if event.key == pygame.K_LEFT:
player.speed = -3
if event.key == pygame.K_RIGHT:
player.speed = 3
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
player.speed = 0
if event.key == pygame.K_RIGHT:
player.speed = 0
hit = pygame.sprite.spritecollide(shot, aliens, 1)
if len(hit) > 0:
explosion1 = Explosion(shot.rect.centerx, shot.rect.top)
score.value += 1500
shot.kill()
#explode.play()
shot = Blast()
allsprites.add(shot, explosion1)
hit2 = pygame.sprite.spritecollide(player, aliens, 1)
if len(hit2) > 0:
life -= 1
#explode.play()
explosion2 = Explosion(player.rect.centerx, player.rect.centery)
allsprites.add(explosion2)
player.kill()
shot.kill()
if life > 0:
ready = Msg("Push Harder !!.")
ready.update()
allsprites.update()
allsprites.draw(screen)
score.update()
pygame.display.flip()
for item in bombs:
item.kill()
while 1:
event = pygame.event.wait()
if event.type == pygame.KEYDOWN:
break
player = Gun()
shot = Blast()
allsprites.add(player, shot)
if shot.rect.top <= screenrect.top:
shot.kill()
shot = Blast()
allsprites.add(shot)
if life == 2:
men = lives2
if life == 1:
men = lives1
if life == 3:
men = lives3
if life > 0:
screen.blit(men, (0,0))
allsprites.update()
allsprites.draw(screen)
score.update()
# set the loop to "fps" cycles per second
clock.tick(fps)
# update the display
pygame.display.flip()
# close pygame
pygame.quit()
答案 0 :(得分：-1)
这是“pythonic”方式，因为空列表为False：
if not enemies:
print("game over")
gameover()
杀死外星人的代码部分在哪里？