'break' 关键字是否阻止代码运行在 Python 中再次循环？

Question

这是我的代码，其中我尝试在创建元组映射列表时引用元组的墙列表，它的索引 [variable][2] 作为属性墙壁或地板：

map = []
walls = [(0,3), (0,4), (0,5), (0,7), (2,7), (3,7), (4,7), (5,7), (1,7),
(5,6), (5,4), (2,3), (2,4), (3,5), (3,0), (3,1), (3,2), (7,0), (7,1), (7,5), 
(7,6), (7,7), (8,7)]
for x in range(9):
    for y in range(9):
        for a in range(len(walls)):
            if walls[a][0] == x and walls[a][1] == y:
                map.append(tuple((x,y,"w")))
            else:
                map.append(tuple((x,y,"_")))
            break

---> [(0, 0, '_'), (0, 1, '_'), (0, 2, '_'), (0, 3, 'w'), (0, 4, '_'), (0, 5, '_'), (0, 6, '_'), (0, 7, '_'), (0, 8, '_'), (1, 0, '_'), (1, 1, '_'), (1, 2, '_'), (1, 3, '_'), (1, 4, '_'), (1, 5, '_'), (1, 6, '_'), (1, 7, '_'), (1, 8, '_'), (2, 0, '_'), (2, 1, '_'), (2, 2, '_'), (2, 3, '_'), (2, 4, '_'), (2, 5, '_'), (2, 6, '_'), (2, 7, '_'), (2, 8, '_'), (3, 0, '_'), (3, 1, '_'), (3, 2, '_'), (3, 3, '_'), (3, 4, '_'), (3, 5, '_'), (3, 6, '_'), (3, 7, '_'), (3, 8, '_'), (4, 0, '_'), (4, 1, '_'), (4, 2, '_'), (4, 3, '_'), (4, 4, '_'), (4, 5, '_'), (4, 6, '_'), (4, 7, '_'), (4, 8, '_'), (5, 0, '_'), (5, 1, '_'), (5, 2, '_'), (5, 3, '_'), (5, 4, '_'), (5, 5, '_'), (5, 6, '_'), (5, 7, '_'), (5, 8, '_'), (6, 0, '_'), (6, 1, '_'), (6, 2, '_'), (6, 3, '_'), (6, 4, '_'), (6, 5, '_'), (6, 6, '_'), (6, 7, '_'), (6, 8, '_'), (7, 0, '_'), (7, 1, '_'), (7, 2, '_'), (7, 3, '_'), (7, 4, '_'), (7, 5, '_'), (7, 6, '_'), (7, 7, '_'), (7, 8, '_'), (8, 0, '_'), (8, 1, '_'), (8, 2, '_'), (8, 3, '_'), (8, 4, '_'), (8, 5, '_'), (8, 6, '_'), (8, 7, '_'), (8, 8, '_')]

问题：只有一个坐标被检查并分配'w'，而其余的都没有。我看到问题的逻辑点是 break 语句。 break 语句是否再次阻止运行中的最后一个嵌套 for 循环。它不应该：x=0, y=3, a=0, break ---> x=0, y=4, a=0, a=1, break --->...

Answer 1

来自 python 文档：

The break statement, like in C, breaks out of the smallest enclosing for or while loop.

进一步阅读 here。

Yahli，希望这对你有所帮助。

'break' 关键字是否阻止代码运行在 Python 中再次循环？

Does the 'break' keyword prevent the code from running that loop again in Python?

python

loops

break

'break' 关键字是否阻止代码 运行 在 Python 中再次循环？

Does the 'break' keyword prevent the code from running that loop again in Python?

python

loops

break

'break' 关键字是否阻止代码运行在 Python 中再次循环？