I have a simple for loop:
我有一个简单的for循环：
for index, (key, value) in enumerate(self.addArgs["khzObj"].nodes.items()):
and I want to start a new wx horizontal boxsizer after every 3rd item to create a panel with 3 nodes each and going on for as many as are in nodes. The obvious solution is to do:
我希望在每第3个项目之后启动一个新的wx水平boxsizer来创建一个面板，每个面板包含3个节点，并继续与节点中的节点一样多。显而易见的解决方案是：
if index % 3 == 0: add a horizontal spacer
but the enumerate starts at 0, so 0 % 3 == 0 and it would start a new row right off the bat. I've tried doing:
但是枚举从0开始，所以0％3 == 0并且它会立即开始一个新的行。我试过了：
if index == 0: index = index + 1
but of course that doesn't work because it creates a new var instead of changing the original -- so I get 1, 1, 2, 3, 4, etc and that won't work because I'll get 4 nodes before I hit a index % 3 == 0.
但当然这不起作用，因为它创建一个新的var而不是更改原始 - 所以我得到1,1,2,3,4等，这将无法工作，因为我会得到4个节点之前我点击指数％3 == 0。
Any suggestions on how to do this? This isn't a big enumerate, usually only about 10-15 items. Thanks.
有关如何做到这一点的任何建议？这不是一个很大的枚举，通常只有大约10-15项。谢谢。
2 个解决方案
#1
17
Since Python 2.6, enumerate() takes an optional start parameter to indicate where to start the enumeration. See the documentation for enumerate.
从Python 2.6开始，enumerate（）接受一个可选的start参数来指示枚举的起始位置。请参阅枚举文档。
#2
3
You are going to hate this answer for how obvious it is, but you could just do:
你会憎恨这个答案是多么明显，但你可以做到：
if index % 3 == 2: add a horizontal spacer
This adds the spacer after the 2nd element (which is actually the third), and every third element after it.
这在第二个元素（实际上是第三个元素）之后添加了间隔物，并且在它之后添加了第三个元素。
#1
17
Since Python 2.6, enumerate() takes an optional start parameter to indicate where to start the enumeration. See the documentation for enumerate.
从Python 2.6开始，enumerate（）接受一个可选的start参数来指示枚举的起始位置。请参阅枚举文档。
#2
3
You are going to hate this answer for how obvious it is, but you could just do:
你会憎恨这个答案是多么明显，但你可以做到：
if index % 3 == 2: add a horizontal spacer
This adds the spacer after the 2nd element (which is actually the third), and every third element after it.
这在第二个元素（实际上是第三个元素）之后添加了间隔物，并且在它之后添加了第三个元素。