我在处理我的AI寻路（你不需要理解），不知为何，当我在shell中执行以下操作时，我的On[3]列表发生了扩展：
tempList.append([On[1]-1])（在程序出错之后。）为什么？
程序没有崩溃，但这不是我的问题。截图（忽略额外的打印输出，我正在尝试缩小导致问题的代码范围。）
On[1] 是我的Y坐标。
相关代码位于#查找路径（在底部部分下）。我的代码（超过200行长。:/）
# 设置Python ----------------------------------------------- #import pygame, sys, random, time, webbrowser, osfrom datetime import datetime# 版本 ---------------------------------------------------- #Version = '1.0'# 设置pygame/窗口 ---------------------------------------- #x = 100y = 100import osos.environ['SDL_VIDEO_WINDOW_POS'] = "%d,%d" % (x,y)mainClock = pygame.time.Clock()from pygame.locals import *pygame.init()pygame.display.set_caption('Pathfinding '+(Version)+'')WINDOWWIDTH = 200WINDOWHEIGHT = 200screen = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT),pygame.NOFRAME)# 字体 ------------------------------------------------------- #basicFont = pygame.font.SysFont(None, 20)# 图像 ----------------------------------------------------- ## 音频 ------------------------------------------------------ ## 颜色 ----------------------------------------------------- #WHITE = (255,255,255)BLACK = (0,0,0)GRAY3 = (105,105,105)GRAY = (195,195,195)GRAY2 = (127,127,127)RED = (255,0,0)GREEN = (0,255,0)BLUE = (0,0,255)GOLD = (255,215,0)PURPLE = (115,0,242)# 变量 -------------------------------------------------- #Map = ['0000000000', '0300000000', '0000000000', '0200000000', '0000000000', '0000000000', '0000000000', '0000000000', '0000000000', '0000000000']Column = 0Row = 0Nodes = {}for whatevs in Map: for whatevs2 in Map[Row]: Nodes[''+(str(Column))+','+(str(Row))+''] = [Column,Row,int(whatevs2)] if whatevs2 == '3': On = [Column,Row,[[Column,Row]]] Column += 1 if Column == 10: Column = 0 Row += 1Open = {}Closed = {}# 矩形 ------------------------------------------------------ ## 定义 ------------------------------------------------ #def Distance(Location,End): if Location != []: if int(Location[0]) < End[0]: Dist = End[0] - int(Location[0]) else: Dist = int(Location[0]) - End[0] if int(Location[1]) < End[1]: Dist2 = End[1] - int(Location[1]) else: Dist2 = int(Location[1]) - End[1] Dist += Dist2 if Location[2] == 1: return 100000 elif Location[2] == 2: return 0 else: return Dist else: return 100000# FPS -------------------------------------------------------- #FPS = 80TrueFPSCount = 0TrueFPS = 0fpsOn = FalsePrevNow = 0# 文本 -------------------------------------------------------- #def drawText(text, font, color, surface, x, y): textobj = font.render(text, 1, color) textrect = textobj.get_rect() textrect.topleft = (x, y) screen.blit(textobj, textrect)# 循环 ------------------------------------------------------- #while True: # 黑屏 ------------------------------------------- # screen.fill(BLACK) # 显示节点 --------------------------------------------- # for Node in Nodes: Rect = pygame.Rect(Nodes[Node][0]*20,Nodes[Node][1]*20,20,20) if Nodes[Node][2] == 0: pygame.draw.rect(screen,WHITE,Rect) elif Nodes[Node][2] == 1: pygame.draw.rect(screen,BLUE,Rect) elif Nodes[Node][2] == 2: pygame.draw.rect(screen,GREEN,Rect) End = [Nodes[Node][0],Nodes[Node][1]] else: pygame.draw.rect(screen,RED,Rect) for Node in Closed: Rect = pygame.Rect(Closed[Node][0]*20,Closed[Node][1]*20,20,20) pygame.draw.rect(screen,(0,100,200),Rect) Rect2 = pygame.Rect(On[0]*20,On[1]*20,20,20) pygame.draw.rect(screen,(0,200,100),Rect2) if [On[0],On[1]] == End: print('完成。') print(On[2]) input() time.sleep(3) pygame.quit() sys.exit() # 查找路径 ---------------------------------------------- # Top = [] Bottom = [] Right = [] Left = [] Closed[''+(str(On[0]))+','+(str(On[1]))+''] = [On[0],On[1]] try: Top.append(Nodes[''+(str(On[0]))+','+(str(On[1]-1))+''][0]) Top.append(Nodes[''+(str(On[0]))+','+(str(On[1]-1))+''][1]) Top.append(Nodes[''+(str(On[0]))+','+(str(On[1]-1))+''][2]) tempList = [] tempList = On[2] print(On) tempList.append([On[0],On[1]-1]) print(On) Top.append(tempList) for item in Closed: if Top != []: if item == ''+(str(Top[0]))+','+(str(Top[1]))+'': Top = [] except NameError: pass except KeyError: pass try: Bottom.append(Nodes[''+(str(On[0]))+','+(str(On[1]+1))+''][0]) Bottom.append(Nodes[''+(str(On[0]))+','+(str(On[1]+1))+''][1]) Bottom.append(Nodes[''+(str(On[0]))+','+(str(On[1]+1))+''][2]) tempList = [] tempList = On[2] print('?') print(On) tempList.append([On[0],On[1]+1]) print(On) print() Bottom.append(tempList) print('On') print(On) for item in Closed: if Bottom != []: if item == ''+(str(Bottom[0]))+','+(str(Bottom[1]))+'': Bottom = [] except NameError: pass except KeyError: pass try: Right.append(Nodes[''+(str(On[0]+1))+','+(str(On[1]))+''][0]) Right.append(Nodes[''+(str(On[0]+1))+','+(str(On[1]))+''][1]) Right.append(Nodes[''+(str(On[0]+1))+','+(str(On[1]))+''][2]) tempList = [] tempList = On[2] tempList.append([On[0]+1,On[1]]) Right.append(tempList) for item in Closed: if Right != []: if item == ''+(str(Right[0]))+','+(str(Right[1]))+'': Right = [] except NameError: pass except KeyError: pass try: Left.append(Nodes[''+(str(On[0]-1))+','+(str(On[1]))+''][0]) Left.append(Nodes[''+(str(On[0]-1))+','+(str(On[1]))+''][1]) Left.append(Nodes[''+(str(On[0]-1))+','+(str(On[1]))+''][2]) tempList = [] tempList = On[2] tempList.append([On[0]-1,On[1]]) Left.append(tempList) for item in Closed: if Left != []: if item == ''+(str(Left[0]))+','+(str(Left[1]))+'': Left = [] except NameError: pass except KeyError: pass if Top != []: Open[''+(str(Top[0]))+','+(str(Top[1]))+''] = [Distance(Top,End),Top[0],Top[1],Top[3]] if Bottom != []: print(':D') print(On) Open[''+(str(Bottom[0]))+','+(str(Bottom[1]))+''] = [Distance(Bottom,End),Bottom[0],Bottom[1],Bottom[3]] if Right != []: Open[''+(str(Right[0]))+','+(str(Right[1]))+''] = [Distance(Right,End),Right[0],Right[1],Right[3]] if Left != []: Open[''+(str(Left[0]))+','+(str(Left[1]))+''] = [Distance(Left,End),Left[0],Left[1],Left[3]] Lowest = [0,0] LowestNum = 100000 try: del Open[''+(str(On[0]))+','+(str(On[1]))+''] except KeyError: pass for Place in Open: if Open[Place][0] < LowestNum: LowestNum = Open[Place][0] Lowest = [Open[Place][1],Open[Place][2],Open[Place][3]] On = Lowest # FPS ---------------------------------------------------- # NewSec = False TrueFPSCount += 1 now = datetime.now() now = now.second if PrevNow != now: PrevNow = now NewSec = True TrueFPS = TrueFPSCount TrueFPSCount = 0 TrueFPS = str(TrueFPS) # 按钮 ------------------------------------------------ # for event in pygame.event.get(): if event.type == KEYDOWN: if event.key == K_ESCAPE: pygame.quit() sys.exit() if event.key == ord('x'): if fpsOn == True: fpsOn = False elif fpsOn == False: fpsOn = True # 更新 ------------------------------------------------- # if fpsOn == True: drawText('FPS:'+(TrueFPS)+'', basicFont, WHITE, screen, 500,12) pygame.display.update() mainClock.tick(10)我不使用类或精灵。:P谢谢你来看！
回答：
因为你的On[-1]和tempList是同一个对象。这就是同一个对象的工作原理：
>>> x=[1,2,3]>>> y=x>>> y.append(10)>>> x[1, 2, 3, 10]>>> y[1, 2, 3, 10]>>> 