我正在使用 shelve 来存储一些数据。
Traceback (most recent call last):
File "rogue.py", line 312, in <module>
curses.wrapper(game)
File "/usr/lib/python3.3/curses/__init__.py", line 94, in wrapper
return func(stdscr, *args, **kwds)
File "rogue.py", line 289, in game
save_game(y,x)
File "rogue.py", line 119, in save_game
file['player'] = player
File "/usr/lib/python3.3/shelve.py", line 124, in __setitem__
p.dump(value)
_pickle.PicklingError: Can't pickle <class 'method'>: attribute lookup builtins.method failed
我环顾四周，发现有关未绑定(bind)方法的内容可能会导致此问题，但我无法在我的代码中找到问题。
问题出现在
file['player'] = player
玩家是类实体:
player = entity(y,x, '@', 200, False)
这是类实体的代码:
class entity:
def __init__(self, y, x, ch, speed, ai=True):
self.y = y
self.x = x
self.ch = ch
self.speed = speed
self.ai = ai
self.ap = 0
self.current_action = {'action': self.wait, 'cost': self.speed}
self.my_turn = False
def draw(self):
world[self.y][self.x].walkable = False
gamepad.addch(self.y, self.x, self.ch)
def take_turn(self):
self.my_turn = True
cost = self.current_action['cost']
self.current_action['action']()
return cost
def move(self, dy, dx):
if self.my_turn == False:
self.current_action = {'action': partial(self.move, dy,dx), 'cost':200}
deck.append(self)
if self.my_turn == True:
#p = previous
py = self.y
px = self.x
pt = world[py][px]
#Paint previous ground tile
pt.walkable = True
gamepad.addch(pt.y,pt.x,pt.ch)
if world[dy][dx].walkable == True:
self.y = dy
self.x = dx
world[dy][dx].walkable = False
if self.ai == False:
draw_map(self.y,self.x)
self.my_turn = False
return self.y,self.x
def wait(self):
self.current_action = {'action': self.wait, 'cost': self.speed}
def drunk_move(self):
dy = self.y + random.randint(-1,1)
dx = self.x + random.randint(-1,1)
self.move(dy, dx)
def ai_simple(self):
#Figure out if player is higher or not:
wherey = self.y - player.y
if wherey > 0:
dy = self.y-1
else:
dy = self.y+1
wherex = self.x - player.x
if wherex > 0:
dx = self.x-1
else:
dx = self.x+1
self.move(dy, dx)
在发布这篇文章之前，我尝试用 pudb 最后看一眼 - 我也遇到了一个错误
file['world'] = world
_
│ File "/usr/lib/python3.3/shelve.py", line 124, in │
│__setitem__ │
│ p.dump(value) │
│_pickle.PicklingError: Can't pickle <class │
│'__main__.tile'>: attribute lookup __main__.tile failed │
(在没有 pudb 的情况下运行代码时不显示)
这就是世界:
world = [[ tile(yy,xx,True,'.')
for xx in range(WORLD_WIDTH) ]
for yy in range(WORLD_HEIGHT) ]
这是类磁贴:
class tile:
def __init__(self,y,x,walkable,ch):
self.x = x
self.y = y
self.walkable = walkable
self.ch = ch
最后，这是调用 shelve 的完整函数:
def save_game():
file = shelve.open('savegame', 'n')
file['world'] = world
file['player']= player
file.close()
我相信这就是所有相关代码。
是什么导致了这些错误？
请您参考如下方法:
第一个问题是由您的实体类中的这一行引起的:
self.current_action = {'action': self.wait, 'cost': self.speed}
current_action 包含对无法 pickle 的绑定(bind)方法的引用。你可以使用 __getstate__和 __setstate__改变你的 pickle 行为，所以你不 pickle 方法，但它的名称(或在分配 partial 对象的情况下的名称和参数)在 pickle 时，并在 unpickling 时间恢复该值。
我不太确定你的第二个问题，但如果它只发生在你在调试器中运行它时，它可能是调试器如何加载 __main__ 模块的问题。您可以尝试将您的 __main__ block 移动到另一个模块并从那里导入和启动您的代码。有时这可以解决这些问题。
