删除列表项直到列表为空

Question

我目前有一个网格显示在我的屏幕和一个块正在填补。我希望每一块都用随机颜色填充。因此，我想从列表中删除coords_list(random_coord)，当它被调用时，这样我的pygame.draw.rect就不会试图在现有颜色的基础上打印新颜色。你知道吗

将从from itertools import product开始的代码块放到pygame.draw.rect.............时出错：

coord_location = coords_list[random_coord] index is out of range

我的代码：

from itertools import product
coords_list = list(product(range(30,1170,30), range(30,870, 30)))

#random map co-ordinate
random_coord = random.randint(0,1065)
coord_location = coords_list[random_coord]
coord_loc_x = coord_location[0]
coord_loc_y = coord_location[1]
#Random color
random_choice = random.randint(0,2)
if random_choice == 0:
    terrain = blue
if random_choice == 1:
    terrain = green
if random_choice == 2:
    terrain = tan
##print(coord_location)
##random_terrain_type = terrain_types(random_choice)
pygame.draw.rect(screen, terrain, (coord_loc_x,coord_loc_y,30,30), 0)

line_start = 30
line_end = 30
top_line_start = 30
bottom_line_end = 30
for i in range(29):
    pygame.draw.line(screen, black, (30, line_start), (1170, line_end),1)
    line_start += 30
    line_end += 30
for i in range(39):
    pygame.draw.line(screen, black, (top_line_start, 30),     (bottom_line_end, 870), 1)
    top_line_start += 30
    bottom_line_end += 30

Answer 1

问题是1065在一个超出范围的索引中

>>> coords_list = list(product(range(30,1170,30), range(30,870, 30)))
>>> len(coords_list)
1064

这意味着最大索引是1063（python列表索引从0开始）

你的随机索引函数应该是

random.randint(0,1063)

或者，如果您不想硬编码数字，random库也有

random.choice(coords_list)

它将从列表中随机选取一项，不管长度如何

Answer 2

我认为有两种方法可以解决这个问题。主要问题在于这段代码：

random_coord = random.randint(0,1065)
coord_location = coords_list[random_coord]
coord_loc_x = coord_location[0]
coord_loc_y = coord_location[1]

方法一不依赖于以随机顺序填充的正方形。我们假设每个正方形都需要填充，所以我们只需按顺序用随机颜色填充它们：

for coords in coords_list:
  coord_location = coords
  coord_loc_x = coord_location[0]
  coord_loc_y = coord_location[1]
  #Random color
  random_choice = random.randint(0,2)
  if random_choice == 0:
    terrain = blue
  if random_choice == 1:
    terrain = green
  if random_choice == 2:
    terrain = tan
  ##print(coord_location)
  ##random_terrain_type = terrain_types(random_choice)
  pygame.draw.rect(screen, terrain, (coord_loc_x,coord_loc_y,30,30), 0)

  line_start = 30
  line_end = 30
  top_line_start = 30
  bottom_line_end = 30
  for i in range(29):
    pygame.draw.line(screen, black, (30, line_start), (1170, line_end),1)
    line_start += 30
    line_end += 30
  for i in range(39):
    pygame.draw.line(screen, black, (top_line_start, 30),     (bottom_line_end, 870), 1)
    top_line_start += 30
    bottom_line_end += 30

方法2将用随机颜色以随机顺序填充正方形：

import random
while len(coords_list) > 0:
  coord_location = random.choice(coords_list)
  coords_list.remove(coord_location)
  coord_loc_x = coord_location[0]
  coord_loc_y = coord_location[1]
  #Random color
  random_choice = random.randint(0,2)
  if random_choice == 0:
    terrain = blue
  if random_choice == 1:
    terrain = green
  if random_choice == 2:
    terrain = tan
##print(coord_location)
##random_terrain_type = terrain_types(random_choice)
  pygame.draw.rect(screen, terrain, (coord_loc_x,coord_loc_y,30,30), 0)

  line_start = 30
  line_end = 30
  top_line_start = 30
  bottom_line_end = 30
  for i in range(29):
    pygame.draw.line(screen, black, (30, line_start), (1170, line_end),1)
    line_start += 30
    line_end += 30
  for i in range(39):
    pygame.draw.line(screen, black, (top_line_start, 30),     (bottom_line_end, 870), 1)
    top_line_start += 30
    bottom_line_end += 30