索引超出范围

Question

这是我的程序，我不明白为什么这个错误出现在第41行：＆＃34;索引60超出了大小60的轴0和＃34;它的游戏是生活和我试图自己做，因为我在python中的新事物很难理解互联网上的那些......

import numpy as np

rows=60
cols=60
size=rows*cols
nb_steps=300
array=np.random.randint(0,high=2, size=size,dtype=int).reshape(rows,cols)
next_state=np.zeros((rows,cols),dtype=int)
alive=1
dead=0
grid=np.int(size)

def nb_neighbors(grid):
 neighbors=np.zeros((rows,cols),dtype=int)
    for x in range (rows):
       for y in range (cols):
        if x==0 and y==0:
            neighbors[x][y]=grid[x-1][y]+grid[x-1][y+1]+grid[x][y+1]
        if x==0 and y==59:
            neighbors[x][y]=grid[x+1][y]+grid[x+1][y-1]+grid[x][y-1]
        if x==59 and y==0:
            neighbors[x][y]=grid[x][y+1]+grid[x+1][y+1]+grid[x+1][y]
        if x==59 and y==59:
            neighbors[x][y]=grid[x][y-1]+grid[x-1][y-1]+grid[x-1][y]      
        if y-1==0:
            neighbors[x][y]=grid[x-1][y]+grid[x+1][y]+grid[x-1][y+1]+grid[x][y+1]+grid[x+1][y+1]
        if y+1==0:
            neighbors[x][y]=grid[x-1][y-1]+grid[x][y-1]+grid[x+1][y-1]+grid[x-1][y]+grid[x+1][y]
        if x-1==0:
            neighbors[x][y]=grid[x][y-1]+grid[x+1][y-1]+grid[x+1][y]+grid[x][y+1]+grid[x+1][y+1]
        if x+1==0:
            neighbors[x][y]=grid[x-1][y-1]+grid[x][y-1]+grid[x-1][y]+grid[x-1][y+1]+grid[x][y+1]
        else :
            neighbors[x][y]=grid[x-1][y-1]+grid[x][y-1]+grid[x+1][y-1]+grid[x-1][y]+grid[x+1][y]+grid[x-1][y+1]+grid[x][y+1]+grid[x+1][y+1]
return neighbors

def next_state(old): 
  next_state=np.zeros((rows,cols),dtype=int)
  neighbors=nb_neighbors(old)
    for x in range (rows):
        for y in range(cols):

        if old[x][y] == alive and (neighbors[x][y] == 2 or neighbors[x][y] == 3):
            next_state[x][y] = alive

        if old[x][y] == dead and neighbors[x][y] == 3:
            next_state[x][y] = alive    
        else :
            next_state[x][y]= dead
return next

following=next_state(array)

  for i in range (nb_steps):
      following=next_state(following)

print (following)