python - 计算 python 中的二维列表

Question

如何计算此二维列表中“命中”的项目数？

grid = [['hit','miss','miss','hit','miss'],
     ['miss','miss','hit','hit','miss'],
     ['miss','miss','miss','hit','hit'],
     ['miss','miss','miss','hit','miss'],
     ['hit','miss','miss','miss','miss']]

battleships = 0
for i in grid:
    if i == "hit":
    battleships = battleships + 1
print battleships

我知道代码是错误的，但它给出了我希望做什么的想法？？

谢谢

Answer 1

使用list.count :

>>> ['hit','miss','miss','hit','miss'].count('hit')
2

>>> grid = [['hit','miss','miss','hit','miss'],
...      ['miss','miss','hit','hit','miss'],
...      ['miss','miss','miss','hit','hit'],
...      ['miss','miss','miss','hit','miss'],
...      ['hit','miss','miss','miss','miss']]
>>> [row.count('hit') for row in grid]
[2, 2, 2, 1, 1]

和sum :

>>> sum(row.count('hit') for row in grid)
8