在python中有没有更简单的方法来编写6个嵌套的for循环? [英] In python is there an easier way to write 6 nested for loops?

问题描述

这个问题已经困扰我一段时间了.有没有更简单的方法在 python 中编写嵌套的 for 循环?例如，如果我的代码是这样的:

This problem has been getting at me for a while now. Is there an easier way to write nested for loops in python? For example if my code went something like this:

  for y in range(3):
    for x in range(3):
      do_something()
      for y1 in range(3):
        for x1 in range(3):
          do_something_else()

有没有更简单的方法来做到这一点?我知道这段代码有效，但是当你像我一样缩进而不是使用 2 个空格时，它可能会成为一个问题.

would there be an easier way to do this? I know that this code works but when you indent instead of using 2 spaces, like me, it can get to be a problem.

哦，在这个例子中，只有 4 个嵌套的 for 循环让事情变得更容易.

Oh in the example there were only 4 nested for loops to make things easier.

推荐答案

如果您像示例中那样经常迭代笛卡尔积，您可能需要研究 Python 2.6 的 itertools.product -- 如果您使用的是较早的 Python，请自行编写.

If you're frequently iterating over a Cartesian product like in your example, you might want to investigate Python 2.6's itertools.product -- or write your own if you're in an earlier Python.

from itertools import product
for y, x in product(range(3), repeat=2):
  do_something()
  for y1, x1 in product(range(3), repeat=2):
    do_something_else()

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