更改網格的多個部分的值（字符串列表？）

Question

我正在製作一個10乘10的網格0 s。我希望能夠通過if語句將（例如）前5行更改爲「ONE」。

什麼是最好的方式去做沒有針對每個人0？

我試過做類似grid[:5][:5]的目標多個0 s，但是這並沒有做任何事情。

grid = [[0 for x in range(10)] for y in range(10)] 

number = 1 

if number is 1: 
    grid[:5][:5] = "ONE" 

for row in grid: 
    print(" ".join(map(str, row))) 

Answer 1

您可以使用兩個嵌套循環for：

for row in range(5): 
    for col in range(10): 
     grid[row][col] = 'ONE' 

Answer 2

由於電網[5] [5]返回一個新的列表，改變新的列表不會產生你想要的結果。

grid = [[0]*10 for x in range(10)] #pythonic way of making a list/list of list (grid) 

number = 1 
if number == 1: 
    for x in xrange(5): 
     for y in xrange(10): 
      grid[x][y] = "ONE" 

print(grid) 

輸出：

[['ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE'], 
['ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE'], 
['ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE'], 
['ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE'], 
['ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE', 'ONE'], 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]] 

Answer 3

你可以做到這一點，太，內list comprehension：

grid = [[0 for x in range(10)] for y in range(10)] 

number = 1 
if number == 1: 
    grid = [["ONE" if y <5 else 0 for x in range(10)] for y in range(10)] 

for k in grid: 
    print(" ".join(map(str,k))) 

輸出：

ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE 
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE 
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE 
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE 
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE 
0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0