在 Python 中保持字典参数顺序的方法是什么? [英] What's the way to keep the dictionary parameter order in Python?

问题描述

def createNode(doc_, **param_):cache = {'p':'property','l':'label','td':'totalDelay','rd':'routeDelay','ld':'logicDelay'}对于 param_ 中的索引:newIndex = 缓存[索引]值 = param_[索引]打印 newIndex, '=', value

def createNode(doc_, **param_):
    cache = {'p':'property','l':'label','td':'totalDelay','rd':'routeDelay','ld':'logicDelay'}
    for index in param_:
        newIndex = cache[index]
        value = param_[index]
        print newIndex, '=', value

文档 = 10createNode(doc, p='path', l='ifft4k_radix4_noUnolling_core.vi', td='3.0', ld='1.0', rd='2.0')
doc = 10 
createNode(doc, p='path', l='ifft4k_radix4_noUnolling_core.vi', td='3.0', ld='1.0', rd='2.0')

在 Python 2.6 上运行此代码会得到以下结果.
Running this code on Python 2.6 gives me the following result.
路由延迟 = 2.0属性 = 路径总延迟 = 3.0逻辑延迟 = 1.0标签 = ifft4k_radix4_noUnolling_core.vi

routeDelay = 2.0
property = path
totalDelay = 3.0
logicDelay = 1.0
label = ifft4k_radix4_noUnolling_core.vi

我需要保持参数的顺序，我的意思是，property 先出现，然后是 label，直到最后得到 routeDelay.
I need to keep the order of the parameters, I mean, property comes first, then label until I get routeDelay last. 
问:在 Python 中保持字典参数顺序的方法是什么?
Q : What's the way to keep the dictionary parameter order in Python?
推荐答案

我需要保持顺序参数，我的意思是，属性来了首先，然后标记直到我得到reouteDelay 最后一次.

  
I need to keep the order of the
  parameter, I mean, property comes
  first, then label until I get
  reouteDelay last.
那么你只是按照错误的顺序做事——不需要有序的字典！相反，尝试使用 cache 对的元组，如下所示:
Then you're simply doing things in the wrong order -- no need for ordered dictionaries!  Try, instead, a tuple of pairs for cache, as follows:
def createNode(doc_, **param_):
    cache = ( ('p', 'property'), , ('l', 'label'), ('td', 'totalDelay'),
              ('rd', 'routeDelay'), ('ld', 'logicDelay') )
    for index, newIndex in cache:
        if index not in param_:
            continue
        value = param_[index]
        print newIndex, '=', value

这与您的 createNode 版本具有完全相同的语义，加上保持您希望的顺序的所需属性，并且性能至少一样好.通过专注于保持字典有序"，您将注意力集中在错误的问题上(唉，对于大多数 情况，人们会找到有序字典"！-).
This has exactly the same semantics as your version of createNode, plus the desired property of maintaining the order you wish, and performance is at least as good.  By focusing on "keeping the dictionary ordered" you're focusing on the wrong problem (as is the case, alas, for most cases where people reach for "ordered dictionaries"!-).

                        
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