如何停止for循环 [英] how to stop a for loop

问题描述

我正在编写代码来确定我的 nxn 列表中的每个元素是否都相同.即 [[0,0],[0,0]] 返回 true 但 [[[0,1],[0,0]] 将返回 false.我正在考虑编写一个代码，当它找到与第一个元素不同的元素时立即停止.即:

I'm writing a code to determine if every element in my nxn list is the same. i.e. [[0,0],[0,0]] returns true but [[0,1],[0,0]] will return false. I was thinking of writing a code that stops immediately when it finds an element that is not the same as the first element. i.e:

n=L[0][0]
m=len(A)
for i in range(m):
 for j in range(m):
   if
    L[i][j]==n: -continue the loop-
   else: -stop the loop-

如果 L[i][j]!==n 并返回 false，我想停止这个循环.否则返回真.我将如何实施这一点?

I would like to stop this loop if L[i][j]!==n and return false. otherwise return true. How would I go about implementing this?

推荐答案

使用 break 和 continue 来做到这一点.可以使用以下命令在 Python 中打破嵌套循环:

Use break and continue to do this. Breaking nested loops can be done in Python using the following:

for a in range(...):
   for b in range(..):
      if some condition:
         # break the inner loop
         break
   else:
      # will be called if the previous loop did not end with a `break` 
      continue
   # but here we end up right after breaking the inner loop, so we can
   # simply break the outer loop as well
   break

另一种方法是将所有内容都包装在一个函数中并使用 return 退出循环.

Another way is to wrap everything in a function and use return to escape from the loop.

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