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lajiiwang金虫 (小有名气)
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[求助]
自学python中，求助下面的程序哪边出错，如何改？
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最近在看《python入门经典》机械工业出版社，张敏译（好像python的书都是翻译过来的）p381页，运行代码清单13.6时，程序出错了，请专家们看看 附件1是英文版的书，电子版我只有英文版的，抱歉！ 附件2是源程序 # -*- coding:utf-8 -*- import random class Island(object): """ Island nXn grid where zreo value indicates not occupied. """ def __init__(self, n, preyCnt=0, predatorCnt=0): ''' Initialize grid to all 0's ,then fill with animals ''' print n, preyCnt, predatorCnt self.gridSize = n self.grid = [] for i in range(n): row = [0] * n self.grid.append(row) self.initAnimals(preyCnt, predatorCnt) def animal(self,x,y): ''' Return animal at location(x,y) ''' if 0 <= x < self.gridSize and 0 <= y <= self.gridSize: return self.grid[x][y] else: return -1 #outside island boundary def initAnimals(self, preyCnt, predatorCnt): ''' Put some intial animals on the island ''' cnt = 0 while cnt < preyCnt: x = random.randint(0, self.gridSize-1) y = random.randint(1, self.gridSize-1) if not self.animal(x, y): newPrey = Prey(island=self , x=x, y=y ) cnt += 1 self.register(newPrey) cnt = 0 while cnt < predatorCnt: x = random.randint(0, self.gridSize-1) y = random.randint(0, self.gridSize-1) if not self.animal(x,y): newPred = Predator(island=self , x=x, y=y ) cnt += 1 self.register(newPred) def size(self): ''' Return size fo the island,i.e. put it at the animal's coordinates ''' return self.gridSize def register(self,animal): ''' Register animal with island, i.e. put it at the animal's coordinates ''' x = animal.x y = animal.y self.grid[x][y] = animal def __str__(self): ''' String representation for printing. (0,0) will be in the lower left corner ''' s = "" for j in range(self.gridSize-1, -1, -1): for i in range(self.gridSize): if not self.grid[j]: s+= "%-2s" %'.' + " " #也可以写成s+="%-2s" %str('.') + " " else: s+= "%-2s" %(str(self.grid[j])) + " " s+="\n" return s def remove(self, x, y): self.grid[x][y] = 0 class Animal(object): def __init__(self, island, x=0 , y=0, s="A"  :''' Initialize the animal's and their positions ''' self.island = island self.name = s self.x = x self.y = y def __str__(self): return self.name def position(self): ''' Return coordinates of current position. ''' return self.x, self.y class Prey(Animal): def __init__(self, island, x=0, y=0, s="O" : Animal.__init__(self, island, x, y, s) def move(self): """ Move to an open, neighboring pisition. """ offset = [(-1,1), (0,1), (1,1), (-1,0), (1,0), (-1,-1), (0,-1), (1,-1)] for i in range(len(offset)): x = self.x + offset[0] y = self.y + offset[1] if self.island.animal(x,y) == 0: self.island.remove(self) self.x = x self.y = y self.island.register(self) break class Predator(Animal): def __init__(self, island, x=0, y=0, s="X" :Animal.__init__(self, island, x, y, s) if __name__ == '__main__': royale = Island(10) moose1 = Prey(island=royale, x=4, y=8, s='a1') moose2 = Prey(island=royale, x=6, y=4, s='a2') royale.register(moose1) royale.register(moose2) #moose1 = Prey(royale, 4, 8, "m1" #moose2 = Prey(royale, 6, 4, "m2" print royale moose1.move() moose2.move() print royale  错误信息.PNG |
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2015-10-18 16:07:50, 9.52 M
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lajiiwang
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