查询Python字典从元组获取值 [英] Query Python dictionary to get value from tuple

问题描述

假设我有一个Python字典，但值是一个元组：

例如。

  dict = {Key1：（ValX1，ValY1，ValZ1），Key2：（ValX2，ValY2，ValZ2） ，...，Key99：（ValX99，ValY99，ValY99）} 
  

仅从元组中检索第三个值，例如。 ValZ1，ValZ2或ValZ99。

我可以使用 .iteritems（）例如：

  for key，val in dict.iteritems（）：
 ValZ = val [2] 
  

然而，是否有更直接的方法？

理想情况下，我想按键查询字典，只返回元组中的第三个值...

eg

dict [Key1] = ValZ1 而不是我目前得到的，这是 dict [Key1] =（ValX1，ValY1，ValZ1）不可调用...

任何建议？

解决方案

只要保持索引：

 >> > D = {Key1：（1,2,3），Key2：（4,5,6）} 
>>> D [Key2] [2] 
 6 
  

Let's say that I have a Python dictionary, but the values are a tuple:

E.g.

dict = {"Key1": (ValX1, ValY1, ValZ1), "Key2": (ValX2, ValY2, ValZ2),...,"Key99": (ValX99, ValY99, ValY99)}

and I want to retrieve only the third value from the tuple, eg. ValZ1, ValZ2, or ValZ99 from the example above.

I could do so using .iteritems(), for instance as:

for key, val in dict.iteritems():
       ValZ = val[2]

however, is there a more direct approach?

Ideally, I'd like to query the dictionary by key and return only the third value in the tuple...

e.g.

dict[Key1] = ValZ1 instead of what I currently get, which is dict[Key1] = (ValX1, ValY1, ValZ1) which is not callable...

Any advice?

解决方案

Just keep indexing:

>>> D = {"Key1": (1,2,3), "Key2": (4,5,6)}
>>> D["Key2"][2]
6

这篇关于查询Python字典从元组获取值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！